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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Till Wegmueller 2026-02-15 13:38:05 +01:00
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<h1 id="running-in-dockerpodman"><a class="header" href="#running-in-dockerpodman">Running in Docker/Podman</a></h1>
<p>vmctl can run inside a container for CI/CD pipelines or isolated environments. The key requirement is access to <code>/dev/kvm</code>.</p>
<h2 id="dockerfile"><a class="header" href="#dockerfile">Dockerfile</a></h2>
<pre><code class="language-dockerfile">FROM rust:1.85-bookworm AS builder
WORKDIR /build
COPY . .
RUN cargo build --release -p vmctl --features vm-manager/pure-iso
FROM debian:bookworm-slim
RUN apt-get update &amp;&amp; apt-get install -y --no-install-recommends \
qemu-system-x86 \
qemu-utils \
openssh-client \
&amp;&amp; rm -rf /var/lib/apt/lists/*
COPY --from=builder /build/target/release/vmctl /usr/local/bin/vmctl
ENV XDG_DATA_HOME=/data
ENTRYPOINT ["vmctl"]
</code></pre>
<p>The <code>pure-iso</code> feature eliminates the need for <code>genisoimage</code> in the container.</p>
<h2 id="docker"><a class="header" href="#docker">Docker</a></h2>
<pre><code class="language-bash">docker build -t vmctl .
docker run --rm \
--device /dev/kvm \
-v vmctl-data:/data \
vmctl list
</code></pre>
<p>The <code>--device /dev/kvm</code> flag passes through KVM access. No <code>--privileged</code> or special capabilities are needed for user-mode networking.</p>
<p>For TAP networking, you'll need <code>--cap-add NET_ADMIN</code> and appropriate bridge configuration.</p>
<h2 id="podman"><a class="header" href="#podman">Podman</a></h2>
<pre><code class="language-bash">podman build -t vmctl .
podman run --rm \
--device /dev/kvm \
-v vmctl-data:/data \
vmctl list
</code></pre>
<p>Podman works identically for user-mode networking.</p>
<h2 id="persistent-data"><a class="header" href="#persistent-data">Persistent Data</a></h2>
<p>Mount a volume at the <code>XDG_DATA_HOME</code> path (<code>/data</code> in the Dockerfile above) to persist VM state and cached images across container runs.</p>
<h2 id="using-vmfiles"><a class="header" href="#using-vmfiles">Using VMFiles</a></h2>
<p>Mount your project directory to use VMFile.kdl:</p>
<pre><code class="language-bash">docker run --rm \
--device /dev/kvm \
-v vmctl-data:/data \
-v $(pwd):/workspace \
-w /workspace \
vmctl up
</code></pre>
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<h1 id="custom-cloud-init-user-data"><a class="header" href="#custom-cloud-init-user-data">Custom Cloud-Init User Data</a></h1>
<p>For advanced guest configuration, you can provide a complete cloud-config YAML file instead of using vmctl's built-in cloud-init generation.</p>
<h2 id="raw-user-data"><a class="header" href="#raw-user-data">Raw User-Data</a></h2>
<pre><code class="language-kdl">vm "custom" {
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
cloud-init {
user-data "cloud-config.yaml"
}
}
</code></pre>
<h2 id="example-cloud-configyaml"><a class="header" href="#example-cloud-configyaml">Example cloud-config.yaml</a></h2>
<pre><code class="language-yaml">#cloud-config
users:
- name: deploy
groups: sudo
shell: /bin/bash
sudo: ALL=(ALL) NOPASSWD:ALL
ssh_authorized_keys:
- ssh-ed25519 AAAA... your-key
package_update: true
packages:
- nginx
- certbot
- python3-certbot-nginx
write_files:
- path: /etc/nginx/sites-available/default
content: |
server {
listen 80;
server_name _;
root /var/www/html;
}
runcmd:
- systemctl enable nginx
- systemctl start nginx
growpart:
mode: auto
devices: ["/"]
</code></pre>
<h2 id="the-pure-iso-feature"><a class="header" href="#the-pure-iso-feature">The pure-iso Feature</a></h2>
<p>By default, vmctl generates the NoCloud seed ISO by shelling out to <code>genisoimage</code> or <code>mkisofs</code>. If neither is available, you can build with the <code>pure-iso</code> feature:</p>
<pre><code class="language-bash">cargo build --release -p vmctl --features vm-manager/pure-iso
</code></pre>
<p>This uses the <code>isobemak</code> crate to generate ISO 9660 images entirely in Rust.</p>
<h2 id="what-vmctl-generates"><a class="header" href="#what-vmctl-generates">What vmctl Generates</a></h2>
<p>When you don't provide raw user-data, vmctl generates a cloud-config that:</p>
<ol>
<li>Creates a user with the specified name.</li>
<li>Grants passwordless sudo.</li>
<li>Sets bash as the default shell.</li>
<li>Injects the SSH public key into <code>authorized_keys</code>.</li>
<li>Disables root login.</li>
<li>Sets the hostname (from <code>hostname</code> field or VM name).</li>
<li>Sets a unique <code>instance-id</code> in the metadata.</li>
</ol>
<p>If you need more control than this, use raw user-data.</p>
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<h1 id="debugging-and-logs"><a class="header" href="#debugging-and-logs">Debugging and Logs</a></h1>
<h2 id="log-verbosity"><a class="header" href="#log-verbosity">Log Verbosity</a></h2>
<p>vmctl uses the <code>tracing</code> crate with <code>RUST_LOG</code> environment variable support:</p>
<pre><code class="language-bash"># Default (info level)
vmctl up
# Debug logging
RUST_LOG=debug vmctl up
# Trace logging (very verbose)
RUST_LOG=trace vmctl up
# Target specific modules
RUST_LOG=vm_manager::ssh=debug vmctl ssh myvm
</code></pre>
<h2 id="vm-logs"><a class="header" href="#vm-logs">VM Logs</a></h2>
<h3 id="console-log"><a class="header" href="#console-log">Console Log</a></h3>
<p>The serial console output is captured to <code>console.log</code> in the VM's work directory. This includes boot messages and cloud-init output:</p>
<pre><code class="language-bash">vmctl log myvm --console
</code></pre>
<h3 id="provision-log"><a class="header" href="#provision-log">Provision Log</a></h3>
<p>Provisioner stdout/stderr is captured to <code>provision.log</code>:</p>
<pre><code class="language-bash">vmctl log myvm --provision
</code></pre>
<h3 id="tail-recent-output"><a class="header" href="#tail-recent-output">Tail Recent Output</a></h3>
<pre><code class="language-bash">vmctl log myvm --console --tail 50
</code></pre>
<h2 id="work-directory"><a class="header" href="#work-directory">Work Directory</a></h2>
<p>Each VM's files are in <code>~/.local/share/vmctl/vms/&lt;name&gt;/</code>:</p>
<pre><code class="language-bash">ls ~/.local/share/vmctl/vms/myvm/
</code></pre>
<p>Contents:</p>
<ul>
<li><code>overlay.qcow2</code> - Disk overlay</li>
<li><code>seed.iso</code> - Cloud-init ISO</li>
<li><code>console.log</code> - Serial output</li>
<li><code>provision.log</code> - Provisioner output</li>
<li><code>qmp.sock</code> - QMP control socket</li>
<li><code>console.sock</code> - Console socket</li>
<li><code>pidfile</code> - QEMU PID</li>
<li><code>id_ed25519_generated</code> - Auto-generated SSH key</li>
<li><code>id_ed25519_generated.pub</code> - Public key</li>
</ul>
<h2 id="qmp-socket"><a class="header" href="#qmp-socket">QMP Socket</a></h2>
<p>You can interact with the QEMU Machine Protocol directly for advanced debugging:</p>
<pre><code class="language-bash"># Using socat
socat - UNIX-CONNECT:~/.local/share/vmctl/vms/myvm/qmp.sock
</code></pre>
<p>After connecting, send <code>{"execute": "qmp_capabilities"}</code> to initialize, then commands like:</p>
<pre><code class="language-json">{"execute": "query-status"}
{"execute": "query-vnc"}
{"execute": "human-monitor-command", "arguments": {"command-line": "info network"}}
</code></pre>
<h2 id="common-issues"><a class="header" href="#common-issues">Common Issues</a></h2>
<h3 id="qemu-spawn-failed"><a class="header" href="#qemu-spawn-failed">"QEMU spawn failed"</a></h3>
<ul>
<li>Verify <code>qemu-system-x86_64</code> is in your PATH.</li>
<li>Check <code>/dev/kvm</code> exists and is accessible.</li>
<li>Ensure your user is in the <code>kvm</code> group.</li>
</ul>
<h3 id="cloud-init-iso-failed"><a class="header" href="#cloud-init-iso-failed">"Cloud-init ISO failed"</a></h3>
<ul>
<li>Install <code>genisoimage</code> or <code>mkisofs</code>.</li>
<li>Or rebuild with <code>--features vm-manager/pure-iso</code>.</li>
</ul>
<h3 id="ssh-failed"><a class="header" href="#ssh-failed">"SSH failed"</a></h3>
<ul>
<li>Check the console log for cloud-init errors: <code>vmctl log myvm --console</code></li>
<li>Verify the guest is reachable (check <code>vmctl status myvm</code> for SSH port).</li>
<li>Ensure sshd is running in the guest.</li>
<li>Try connecting manually: <code>ssh -p &lt;port&gt; -i &lt;key&gt; user@127.0.0.1</code></li>
</ul>
<h3 id="ip-discovery-timeout-tap-networking"><a class="header" href="#ip-discovery-timeout-tap-networking">"IP discovery timeout" (TAP networking)</a></h3>
<ul>
<li>Verify the bridge exists and has DHCP.</li>
<li>Check <code>ip neigh show</code> for the guest's MAC address.</li>
<li>Ensure the guest has obtained a DHCP lease (check console log).</li>
</ul>
<h3 id="vm-stuck-in-stopped-state-but-qemu-still-running"><a class="header" href="#vm-stuck-in-stopped-state-but-qemu-still-running">VM stuck in "Stopped" state but QEMU still running</a></h3>
<ul>
<li>Check <code>vmctl status myvm</code> for the PID.</li>
<li>Verify: <code>kill -0 &lt;pid&gt;</code> - if the process is alive, the QMP socket may be stale.</li>
<li>Destroy and recreate: <code>vmctl destroy myvm</code>.</li>
</ul>
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<h1 id="illumos--propolis-backend"><a class="header" href="#illumos--propolis-backend">illumos / Propolis Backend</a></h1>
<p>vmctl includes experimental support for running VMs on illumos using the Propolis hypervisor (bhyve-based).</p>
<h2 id="requirements"><a class="header" href="#requirements">Requirements</a></h2>
<ul>
<li>illumos-based OS (OmniOS, SmartOS, etc.)</li>
<li><code>propolis-server</code> installed and runnable</li>
<li>ZFS pool (default: <code>rpool</code>)</li>
<li><code>nebula-vm</code> zone brand installed</li>
</ul>
<h2 id="how-it-works"><a class="header" href="#how-it-works">How It Works</a></h2>
<p>The Propolis backend manages VMs as illumos zones:</p>
<ol>
<li><strong>Prepare</strong>: Creates a ZFS clone from <code>{pool}/images/{vm}@latest</code> to <code>{pool}/vms/{vm}</code>.</li>
<li><strong>Start</strong>: Boots the zone with <code>zoneadm -z {vm} boot</code>, waits for propolis-server on <code>127.0.0.1:12400</code>, then sends the instance spec and run command via REST API.</li>
<li><strong>Stop</strong>: Sends a stop command to propolis-server, then halts the zone.</li>
<li><strong>Destroy</strong>: Stops the VM, uninstalls the zone (<code>zoneadm uninstall -F</code>), deletes the zone config (<code>zonecfg delete -F</code>), and destroys the ZFS dataset.</li>
</ol>
<h2 id="networking"><a class="header" href="#networking">Networking</a></h2>
<p>Uses illumos VNICs for exclusive-IP zone networking:</p>
<pre><code class="language-kdl">network "vnic" {
name "vnic0"
}
</code></pre>
<h2 id="limitations"><a class="header" href="#limitations">Limitations</a></h2>
<ul>
<li>Suspend/resume not yet implemented.</li>
<li>Console endpoint (WebSocket) is defined but not fully integrated.</li>
<li>VNC address not yet exposed.</li>
</ul>
<h2 id="building-for-illumos"><a class="header" href="#building-for-illumos">Building for illumos</a></h2>
<pre><code class="language-bash">cargo build --release -p vmctl --target x86_64-unknown-illumos
</code></pre>
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<h1 id="tap-networking-and-bridges"><a class="header" href="#tap-networking-and-bridges">TAP Networking and Bridges</a></h1>
<p>TAP networking gives VMs a real presence on a host network, with full Layer 2 connectivity.</p>
<h2 id="creating-a-bridge"><a class="header" href="#creating-a-bridge">Creating a Bridge</a></h2>
<pre><code class="language-bash"># Create bridge
sudo ip link add br0 type bridge
sudo ip link set br0 up
# Assign an IP to the bridge (optional, for host-to-guest communication)
sudo ip addr add 10.0.0.1/24 dev br0
</code></pre>
<h2 id="dhcp-with-dnsmasq"><a class="header" href="#dhcp-with-dnsmasq">DHCP with dnsmasq</a></h2>
<p>Provide IP addresses to guests:</p>
<pre><code class="language-bash">sudo dnsmasq \
--interface=br0 \
--bind-interfaces \
--dhcp-range=10.0.0.100,10.0.0.200,12h \
--no-daemon
</code></pre>
<h2 id="ip-forwarding-and-nat"><a class="header" href="#ip-forwarding-and-nat">IP Forwarding and NAT</a></h2>
<p>If you want guests to reach the internet:</p>
<pre><code class="language-bash"># Enable forwarding
sudo sysctl -w net.ipv4.ip_forward=1
# NAT outbound traffic
sudo iptables -t nat -A POSTROUTING -s 10.0.0.0/24 ! -o br0 -j MASQUERADE
</code></pre>
<h2 id="using-with-vmctl"><a class="header" href="#using-with-vmctl">Using with vmctl</a></h2>
<h3 id="imperative"><a class="header" href="#imperative">Imperative</a></h3>
<pre><code class="language-bash">vmctl create --name myvm --image ./image.qcow2 --bridge br0
</code></pre>
<h3 id="declarative"><a class="header" href="#declarative">Declarative</a></h3>
<pre><code class="language-kdl">vm "myvm" {
image "image.qcow2"
network "tap" {
bridge "br0"
}
cloud-init {
hostname "myvm"
}
ssh {
user "ubuntu"
}
}
</code></pre>
<h2 id="ip-discovery"><a class="header" href="#ip-discovery">IP Discovery</a></h2>
<p>vmctl discovers TAP-networked guest IPs by:</p>
<ol>
<li>Checking the ARP table (<code>ip neigh show</code>) for the guest's MAC address on the bridge.</li>
<li>Falling back to dnsmasq lease files.</li>
</ol>
<p>This happens automatically when you run <code>vmctl ssh</code> or provisioners.</p>
<h2 id="security-considerations"><a class="header" href="#security-considerations">Security Considerations</a></h2>
<ul>
<li>TAP interfaces may bypass host firewall rules.</li>
<li>Guests on the bridge can see other devices on the network.</li>
<li>Use iptables rules on the bridge to restrict traffic if needed.</li>
</ul>
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<h1 id="hypervisor-backends"><a class="header" href="#hypervisor-backends">Hypervisor Backends</a></h1>
<h2 id="the-hypervisor-trait"><a class="header" href="#the-hypervisor-trait">The Hypervisor Trait</a></h2>
<p>All backends implement the <code>Hypervisor</code> trait defined in <code>crates/vm-manager/src/traits.rs</code>:</p>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub trait Hypervisor: Send + Sync {
fn prepare(&amp;self, spec: &amp;VmSpec) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn start(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn stop(&amp;self, vm: &amp;VmHandle, timeout: Duration) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn suspend(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn resume(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn destroy(&amp;self, vm: VmHandle) -&gt; impl Future&lt;Output = Result&lt;()&gt;&gt;;
fn state(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;VmState&gt;&gt;;
fn guest_ip(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;String&gt;&gt;;
fn console_endpoint(&amp;self, vm: &amp;VmHandle) -&gt; Result&lt;ConsoleEndpoint&gt;;
}
<span class="boring">}</span></code></pre></pre>
<h2 id="qemu-backend-linux"><a class="header" href="#qemu-backend-linux">QEMU Backend (Linux)</a></h2>
<p>Located in <code>crates/vm-manager/src/backends/qemu.rs</code>.</p>
<p><strong>Prepare:</strong></p>
<ul>
<li>Creates work directory under <code>~/.local/share/vmctl/vms/&lt;name&gt;/</code>.</li>
<li>Creates QCOW2 overlay on top of the base image.</li>
<li>Generates cloud-init seed ISO (if configured).</li>
<li>Allocates a deterministic SSH port (10022-10122 range, hash-based).</li>
<li>Generates a locally-administered MAC address.</li>
</ul>
<p><strong>Start:</strong></p>
<ul>
<li>Launches <code>qemu-system-x86_64</code> with KVM acceleration.</li>
<li>CPU type: <code>host</code> (passthrough).</li>
<li>Machine type: <code>q35,accel=kvm</code>.</li>
<li>Devices: virtio-blk for disk, virtio-rng for entropy.</li>
<li>Console: Unix socket + log file.</li>
<li>VNC: localhost, auto-port.</li>
<li>Networking: User-mode (SLIRP with port forwarding) or TAP (bridged).</li>
<li>Daemonizes with PID file.</li>
<li>Connects via QMP to verify startup and retrieve VNC address.</li>
</ul>
<p><strong>Stop:</strong></p>
<ol>
<li>ACPI power-down via QMP (<code>system_powerdown</code>).</li>
<li>Poll for process exit (500ms intervals) up to timeout.</li>
<li>SIGTERM if timeout exceeded.</li>
<li>SIGKILL as last resort.</li>
</ol>
<p><strong>IP Discovery:</strong></p>
<ul>
<li>User-mode: returns <code>127.0.0.1</code> (SSH via forwarded port).</li>
<li>TAP: parses ARP table (<code>ip neigh show</code>), falls back to dnsmasq lease files by MAC address.</li>
</ul>
<h2 id="qmp-client"><a class="header" href="#qmp-client">QMP Client</a></h2>
<p>Located in <code>crates/vm-manager/src/backends/qmp.rs</code>. Async JSON-over-Unix-socket client implementing the QEMU Machine Protocol.</p>
<p>Commands: <code>system_powerdown</code>, <code>quit</code>, <code>stop</code>, <code>cont</code>, <code>query_status</code>, <code>query_vnc</code>.</p>
<h2 id="propolis-backend-illumos"><a class="header" href="#propolis-backend-illumos">Propolis Backend (illumos)</a></h2>
<p>Located in <code>crates/vm-manager/src/backends/propolis.rs</code>.</p>
<ul>
<li>Uses ZFS clones for VM disks.</li>
<li>Manages zones with the <code>nebula-vm</code> brand.</li>
<li>Communicates with <code>propolis-server</code> via REST API.</li>
<li>Networking via illumos VNICs.</li>
<li>Suspend/resume not yet implemented.</li>
</ul>
<h2 id="noop-backend"><a class="header" href="#noop-backend">Noop Backend</a></h2>
<p>Located in <code>crates/vm-manager/src/backends/noop.rs</code>. All operations succeed immediately. Used for testing.</p>
<h2 id="routerhypervisor"><a class="header" href="#routerhypervisor">RouterHypervisor</a></h2>
<p>Located in <code>crates/vm-manager/src/backends/mod.rs</code>. Dispatches <code>Hypervisor</code> trait calls to the correct backend based on the <code>VmHandle</code>'s <code>BackendTag</code>.</p>
<p>Construction:</p>
<ul>
<li><code>RouterHypervisor::new(bridge, zfs_pool)</code> - Platform-aware, creates the appropriate backend.</li>
<li><code>RouterHypervisor::noop_only()</code> - Testing mode.</li>
</ul>
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<h1 id="crate-structure"><a class="header" href="#crate-structure">Crate Structure</a></h1>
<h2 id="workspace-layout"><a class="header" href="#workspace-layout">Workspace Layout</a></h2>
<pre><code class="language-text">vm-manager/
Cargo.toml # Workspace root
crates/
vm-manager/ # Library crate
Cargo.toml
src/
lib.rs # Re-exports
traits.rs # Hypervisor trait, ConsoleEndpoint
types.rs # VmSpec, VmHandle, VmState, NetworkConfig, etc.
error.rs # VmError with miette diagnostics
vmfile.rs # VMFile.kdl parser and resolver
image.rs # ImageManager (download, cache, overlay)
ssh.rs # SSH connect, exec, streaming, upload
provision.rs # Provisioner runner
cloudinit.rs # NoCloud seed ISO generation
backends/
mod.rs # RouterHypervisor
qemu.rs # QEMU/KVM backend (Linux)
qmp.rs # QMP client
propolis.rs # Propolis/bhyve backend (illumos)
noop.rs # No-op backend (testing)
vmctl/ # CLI binary crate
Cargo.toml
src/
main.rs # CLI entry point, clap App
commands/
create.rs # vmctl create
start.rs # vmctl start, suspend, resume
stop.rs # vmctl stop
destroy.rs # vmctl destroy
list.rs # vmctl list
status.rs # vmctl status
console.rs # vmctl console
ssh.rs # vmctl ssh
image.rs # vmctl image (pull, list, inspect)
up.rs # vmctl up
down.rs # vmctl down
reload.rs # vmctl reload
provision_cmd.rs # vmctl provision
log.rs # vmctl log
</code></pre>
<h2 id="vm-manager-crate"><a class="header" href="#vm-manager-crate">vm-manager Crate</a></h2>
<p>The library crate. Contains all business logic and can be used as a dependency by other Rust projects.</p>
<p><strong>Public re-exports from <code>lib.rs</code>:</strong></p>
<ul>
<li><code>RouterHypervisor</code> (from <code>backends</code>)</li>
<li><code>Hypervisor</code>, <code>ConsoleEndpoint</code> (from <code>traits</code>)</li>
<li><code>VmError</code>, <code>Result</code> (from <code>error</code>)</li>
<li>All types from <code>types</code>: <code>BackendTag</code>, <code>VmSpec</code>, <code>VmHandle</code>, <code>VmState</code>, <code>NetworkConfig</code>, <code>CloudInitConfig</code>, <code>SshConfig</code></li>
</ul>
<h2 id="vmctl-crate"><a class="header" href="#vmctl-crate">vmctl Crate</a></h2>
<p>The CLI binary. Depends on <code>vm-manager</code> and adds:</p>
<ul>
<li>Clap-based argument parsing</li>
<li>Store persistence (<code>vms.json</code>)</li>
<li>Terminal I/O (console bridging, log display)</li>
<li>VMFile discovery and command dispatch</li>
</ul>
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<h1 id="error-handling"><a class="header" href="#error-handling">Error Handling</a></h1>
<h2 id="approach"><a class="header" href="#approach">Approach</a></h2>
<p>vm-manager uses <a href="https://docs.rs/miette">miette</a> for rich diagnostic error reporting. Every error variant includes:</p>
<ul>
<li>A human-readable message.</li>
<li>A diagnostic code (e.g., <code>vm_manager::qemu::spawn_failed</code>).</li>
<li>A <code>help</code> message telling the user what to do.</li>
</ul>
<p>Errors are defined with <code>#[derive(thiserror::Error, miette::Diagnostic)]</code>.</p>
<h2 id="error-variants"><a class="header" href="#error-variants">Error Variants</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Code</th><th>Trigger</th><th>Help</th></tr></thead><tbody>
<tr><td><code>vm_manager::qemu::spawn_failed</code></td><td>QEMU process failed to start</td><td>Ensure <code>qemu-system-x86_64</code> is installed, in PATH, and KVM is available (<code>/dev/kvm</code>)</td></tr>
<tr><td><code>vm_manager::qemu::qmp_connect_failed</code></td><td>Can't connect to QMP socket</td><td>QEMU may have crashed before QMP socket ready; check work directory logs</td></tr>
<tr><td><code>vm_manager::qemu::qmp_command_failed</code></td><td>QMP command returned an error</td><td>(varies)</td></tr>
<tr><td><code>vm_manager::image::overlay_creation_failed</code></td><td>QCOW2 overlay creation failed</td><td>Ensure <code>qemu-img</code> is installed and base image exists and is readable</td></tr>
<tr><td><code>vm_manager::network::ip_discovery_timeout</code></td><td>Guest IP not found</td><td>Guest may not have DHCP lease; check network config and cloud-init</td></tr>
<tr><td><code>vm_manager::propolis::unreachable</code></td><td>Can't reach propolis-server</td><td>Ensure propolis-server is running and listening on expected address</td></tr>
<tr><td><code>vm_manager::cloudinit::iso_failed</code></td><td>Seed ISO generation failed</td><td>Ensure <code>genisoimage</code> or <code>mkisofs</code> installed, or enable <code>pure-iso</code> feature</td></tr>
<tr><td><code>vm_manager::ssh::failed</code></td><td>SSH connection or command failed</td><td>Check SSH key, guest reachability, and sshd running</td></tr>
<tr><td><code>vm_manager::ssh::keygen_failed</code></td><td>Ed25519 key generation failed</td><td>Internal error; please report it</td></tr>
<tr><td><code>vm_manager::image::download_failed</code></td><td>Image download failed</td><td>Check network connectivity and URL correctness</td></tr>
<tr><td><code>vm_manager::image::format_detection_failed</code></td><td>Can't detect image format</td><td>Ensure <code>qemu-img</code> installed and file is valid disk image</td></tr>
<tr><td><code>vm_manager::image::conversion_failed</code></td><td>Image format conversion failed</td><td>Ensure <code>qemu-img</code> installed and sufficient disk space</td></tr>
<tr><td><code>vm_manager::vm::not_found</code></td><td>VM not in store</td><td>Run <code>vmctl list</code> to see available VMs</td></tr>
<tr><td><code>vm_manager::vm::invalid_state</code></td><td>Operation invalid for current state</td><td>(varies)</td></tr>
<tr><td><code>vm_manager::backend::not_available</code></td><td>Backend not supported on platform</td><td>Backend not supported on current platform</td></tr>
<tr><td><code>vm_manager::vmfile::not_found</code></td><td>VMFile.kdl not found</td><td>Create VMFile.kdl in current directory or specify path with <code>--file</code></td></tr>
<tr><td><code>vm_manager::vmfile::parse_failed</code></td><td>KDL syntax error</td><td>Check VMFile.kdl syntax; see https://kdl.dev</td></tr>
<tr><td><code>vm_manager::vmfile::validation</code></td><td>VMFile validation error</td><td>(custom hint per error)</td></tr>
<tr><td><code>vm_manager::provision::failed</code></td><td>Provisioner step failed</td><td>Check provisioner config and VM SSH reachability</td></tr>
<tr><td><code>vm_manager::io</code></td><td>General I/O error</td><td>(transparent)</td></tr>
</tbody></table>
</div>
<h2 id="type-alias"><a class="header" href="#type-alias">Type Alias</a></h2>
<p>The library defines <code>pub type Result&lt;T&gt; = std::result::Result&lt;T, VmError&gt;</code> for convenience. CLI commands return <code>miette::Result&lt;()&gt;</code> for rich terminal output.</p>
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<h1 id="architecture-overview"><a class="header" href="#architecture-overview">Architecture Overview</a></h1>
<p>vm-manager is structured as a two-crate Cargo workspace.</p>
<h2 id="high-level-design"><a class="header" href="#high-level-design">High-Level Design</a></h2>
<pre><code class="language-text">┌─────────────────────────────────────────┐
│ vmctl CLI │
│ (crates/vmctl) │
│ │
│ Commands → VMFile parser → Hypervisor │
└──────────────────┬──────────────────────┘
┌──────────────────┴──────────────────────┐
│ vm-manager library │
│ (crates/vm-manager) │
│ │
│ ┌─────────────┐ ┌──────────────────┐ │
│ │ Hypervisor │ │ Image Manager │ │
│ │ Trait │ │ │ │
│ └──────┬──────┘ └──────────────────┘ │
│ │ │
│ ┌──────┴──────────────────────┐ │
│ │ RouterHypervisor │ │
│ │ ┌──────┐ ┌────────┐ ┌────┐│ │
│ │ │ QEMU │ │Propolis│ │Noop││ │
│ │ └──────┘ └────────┘ └────┘│ │
│ └─────────────────────────────┘ │
│ │
│ ┌───────────┐ ┌──────────────────┐ │
│ │ SSH │ │ Cloud-Init │ │
│ │ Module │ │ Generator │ │
│ └───────────┘ └──────────────────┘ │
│ │
│ ┌───────────┐ ┌──────────────────┐ │
│ │ Provision │ │ VMFile │ │
│ │ Runner │ │ Parser │ │
│ └───────────┘ └──────────────────┘ │
└─────────────────────────────────────────┘
</code></pre>
<h2 id="async-runtime"><a class="header" href="#async-runtime">Async Runtime</a></h2>
<p>vmctl uses Tokio with the multi-threaded runtime. Most operations are async, with one exception: SSH operations use <code>ssh2</code> (libssh2 bindings), which is blocking. These are wrapped in <code>tokio::task::spawn_blocking</code> to avoid blocking the async executor.</p>
<h2 id="platform-abstraction"><a class="header" href="#platform-abstraction">Platform Abstraction</a></h2>
<p>The <code>Hypervisor</code> trait defines a platform-agnostic interface. The <code>RouterHypervisor</code> dispatches calls to the correct backend based on the <code>BackendTag</code> stored in each <code>VmHandle</code>:</p>
<ul>
<li><strong>Linux</strong> builds include <code>QemuBackend</code>.</li>
<li><strong>illumos</strong> builds include <code>PropolisBackend</code>.</li>
<li><strong>All platforms</strong> include <code>NoopBackend</code> for testing.</li>
</ul>
<p>Conditional compilation (<code>#[cfg(target_os = ...)]</code>) ensures only the relevant backend is compiled.</p>
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<h1 id="ssh-subsystem"><a class="header" href="#ssh-subsystem">SSH Subsystem</a></h1>
<h2 id="library"><a class="header" href="#library">Library</a></h2>
<p>vmctl uses the <code>ssh2</code> crate (Rust bindings to libssh2) for SSH operations. The SSH module is at <code>crates/vm-manager/src/ssh.rs</code>.</p>
<h2 id="core-functions"><a class="header" href="#core-functions">Core Functions</a></h2>
<h3 id="connect"><a class="header" href="#connect">connect</a></h3>
<p>Establishes a TCP connection and authenticates via public key.</p>
<p>Supports two authentication modes:</p>
<ul>
<li><strong>In-memory PEM</strong>: Private key stored as a string (used for auto-generated keys).</li>
<li><strong>File path</strong>: Reads key from disk.</li>
</ul>
<h3 id="exec"><a class="header" href="#exec">exec</a></h3>
<p>Executes a command and collects the full stdout/stderr output. Blocking.</p>
<h3 id="exec_streaming"><a class="header" href="#exec_streaming">exec_streaming</a></h3>
<p>Executes a command and streams stdout/stderr in real-time to provided writers. Uses non-blocking I/O:</p>
<ol>
<li>Opens a channel and calls <code>exec()</code>.</li>
<li>Switches the session to non-blocking mode.</li>
<li>Polls stdout and stderr in a loop with 8KB buffers.</li>
<li>Flushes output after each read.</li>
<li>Sleeps 50ms when no data is available.</li>
<li>Switches back to blocking mode to read the exit status.</li>
</ol>
<p>This is used by the provisioner to show build output live.</p>
<h3 id="upload"><a class="header" href="#upload">upload</a></h3>
<p>Transfers a file to the guest via SFTP. Creates the SFTP subsystem, opens a remote file, and writes the local file contents.</p>
<h3 id="connect_with_retry"><a class="header" href="#connect_with_retry">connect_with_retry</a></h3>
<p>Attempts to connect repeatedly until a timeout (typically 120 seconds for provisioning, 30 seconds for <code>vmctl ssh</code>). Uses exponential backoff starting at 1 second, capped at 5 seconds. Runs the blocking connect on <code>tokio::task::spawn_blocking</code>.</p>
<h2 id="why-not-native-ssh"><a class="header" href="#why-not-native-ssh">Why Not Native SSH?</a></h2>
<p>libssh2 is used for programmatic operations (provisioning, connectivity checks) because it can be controlled from Rust code. For interactive sessions (<code>vmctl ssh</code>), vmctl hands off to the system <code>ssh</code> binary for proper terminal handling (PTY allocation, signal forwarding, etc.).</p>
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<h1 id="state-management"><a class="header" href="#state-management">State Management</a></h1>
<h2 id="vm-store"><a class="header" href="#vm-store">VM Store</a></h2>
<p>vmctl persists VM state in a JSON file at <code>$XDG_DATA_HOME/vmctl/vms.json</code> (typically <code>~/.local/share/vmctl/vms.json</code>). Falls back to <code>/tmp</code> if <code>XDG_DATA_HOME</code> is not set.</p>
<p>The store is a simple mapping from VM name to <code>VmHandle</code>.</p>
<h2 id="vmhandle-serialization"><a class="header" href="#vmhandle-serialization">VmHandle Serialization</a></h2>
<p><code>VmHandle</code> is serialized to JSON with all fields. Fields added in later versions have <code>#[serde(default)]</code> annotations, so older JSON files are deserialized without errors (missing fields get defaults).</p>
<p>Example stored handle:</p>
<pre><code class="language-json">{
"id": "abc123",
"name": "myvm",
"backend": "qemu",
"work_dir": "/home/user/.local/share/vmctl/vms/myvm",
"overlay_path": "/home/user/.local/share/vmctl/vms/myvm/overlay.qcow2",
"seed_iso_path": "/home/user/.local/share/vmctl/vms/myvm/seed.iso",
"pid": 12345,
"qmp_socket": "/home/user/.local/share/vmctl/vms/myvm/qmp.sock",
"console_socket": "/home/user/.local/share/vmctl/vms/myvm/console.sock",
"vnc_addr": "127.0.0.1:5900",
"vcpus": 2,
"memory_mb": 2048,
"disk_gb": 20,
"network": {"type": "User"},
"ssh_host_port": 10042,
"mac_addr": "52:54:00:ab:cd:ef"
}
</code></pre>
<h2 id="write-safety"><a class="header" href="#write-safety">Write Safety</a></h2>
<p>The store uses an atomic write pattern:</p>
<ol>
<li>Write to a <code>.tmp</code> file.</li>
<li>Rename (atomic on most filesystems) to the final path.</li>
</ol>
<p>This prevents corruption if the process is interrupted during a write.</p>
<h2 id="state-vs-process-state"><a class="header" href="#state-vs-process-state">State vs Process State</a></h2>
<p>The store records the <em>last known</em> state but doesn't actively monitor QEMU processes. When vmctl queries a VM's state, it:</p>
<ol>
<li>Checks if the PID file exists.</li>
<li>Sends <code>kill(pid, 0)</code> to verify the process is alive.</li>
<li>If alive, queries QMP for detailed status (<code>running</code>, <code>paused</code>, etc.).</li>
<li>If dead, reports <code>Stopped</code>.</li>
</ol>
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<h1 id="vmctl-console"><a class="header" href="#vmctl-console">vmctl console</a></h1>
<p>Attach to a VM's serial console.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl console &lt;NAME&gt;
</code></pre>
<h2 id="arguments"><a class="header" href="#arguments">Arguments</a></h2>
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<tr><td><code>NAME</code></td><td>VM name (positional)</td></tr>
</tbody></table>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>Connects to the VM's serial console via a Unix socket (QEMU) or WebSocket (Propolis). You'll see the same output as a physical serial port: boot messages, kernel output, and a login prompt.</p>
<p>Press <strong>Ctrl+]</strong> (0x1d) to detach from the console.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash">vmctl console myvm
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./ssh.html">vmctl ssh</a>, <a href="./log.html">vmctl log</a></p>
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<h1 id="vmctl-create"><a class="header" href="#vmctl-create">vmctl create</a></h1>
<p>Create a new VM and optionally start it.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl create [OPTIONS] --name &lt;NAME&gt;
</code></pre>
<h2 id="options"><a class="header" href="#options">Options</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Option</th><th>Type</th><th>Default</th><th>Description</th></tr></thead><tbody>
<tr><td><code>--name</code></td><td>string</td><td><em>required</em></td><td>VM name</td></tr>
<tr><td><code>--image</code></td><td>path</td><td></td><td>Path to a local disk image</td></tr>
<tr><td><code>--image-url</code></td><td>string</td><td></td><td>URL to download an image from</td></tr>
<tr><td><code>--vcpus</code></td><td>integer</td><td><code>1</code></td><td>Number of virtual CPUs</td></tr>
<tr><td><code>--memory</code></td><td>integer</td><td><code>1024</code></td><td>Memory in MB</td></tr>
<tr><td><code>--disk</code></td><td>integer</td><td></td><td>Disk size in GB (overlay resize)</td></tr>
<tr><td><code>--bridge</code></td><td>string</td><td></td><td>Bridge name for TAP networking</td></tr>
<tr><td><code>--cloud-init</code></td><td>path</td><td></td><td>Path to cloud-init user-data file</td></tr>
<tr><td><code>--ssh-key</code></td><td>path</td><td></td><td>Path to SSH public key file</td></tr>
<tr><td><code>--start</code></td><td>flag</td><td><code>false</code></td><td>Start the VM after creation</td></tr>
</tbody></table>
</div>
<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>One of <code>--image</code> or <code>--image-url</code> must be provided. If <code>--image-url</code> is given, the image is downloaded and cached.</p>
<p>When <code>--bridge</code> is specified, TAP networking is used. Otherwise, user-mode (SLIRP) networking is used.</p>
<p>When <code>--ssh-key</code> is provided, a cloud-init ISO is generated that injects the public key. The SSH user defaults to <code>"vm"</code>.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash"># Create from a URL with defaults
vmctl create --name myvm --image-url https://example.com/image.img
# Create with custom resources and start immediately
vmctl create --name myvm \
--image-url https://example.com/image.img \
--vcpus 4 --memory 4096 --disk 40 \
--ssh-key ~/.ssh/id_ed25519.pub \
--start
# Create from local image with TAP networking
vmctl create --name myvm --image ./ubuntu.qcow2 --bridge br0
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./start.html">vmctl start</a>, <a href="./up.html">vmctl up</a></p>
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<h1 id="vmctl-destroy"><a class="header" href="#vmctl-destroy">vmctl destroy</a></h1>
<p>Destroy a VM and clean up all associated resources.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl destroy &lt;NAME&gt;
</code></pre>
<h2 id="arguments"><a class="header" href="#arguments">Arguments</a></h2>
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<tr><td><code>NAME</code></td><td>VM name (positional)</td></tr>
</tbody></table>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>Stops the VM if it's running, then removes all associated files: QCOW2 overlay, cloud-init ISO, log files, SSH keys, sockets, and the work directory. Unregisters the VM from the store.</p>
<p>This action is irreversible.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash">vmctl destroy myvm
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./down.html">vmctl down</a> (declarative equivalent)</p>
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<h1 id="vmctl-down"><a class="header" href="#vmctl-down">vmctl down</a></h1>
<p>Bring down VMs defined in VMFile.kdl.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl down [OPTIONS]
</code></pre>
<h2 id="options"><a class="header" href="#options">Options</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Option</th><th>Type</th><th>Default</th><th>Description</th></tr></thead><tbody>
<tr><td><code>--file</code></td><td>path</td><td></td><td>Path to VMFile.kdl (auto-discovered if omitted)</td></tr>
<tr><td><code>--name</code></td><td>string</td><td></td><td>Only bring down a specific VM</td></tr>
<tr><td><code>--destroy</code></td><td>flag</td><td><code>false</code></td><td>Destroy VMs instead of just stopping</td></tr>
</tbody></table>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>Without <code>--destroy</code>, VMs are stopped gracefully (30-second timeout). They can be restarted with <code>vmctl up</code> or <code>vmctl start</code>.</p>
<p>With <code>--destroy</code>, VMs are fully destroyed: all files removed, unregistered from the store. This is irreversible.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash"># Stop all VMs in VMFile.kdl
vmctl down
# Stop a specific VM
vmctl down --name webserver
# Destroy all VMs
vmctl down --destroy
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./up.html">vmctl up</a>, <a href="./destroy.html">vmctl destroy</a></p>
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<h1 id="vmctl-image"><a class="header" href="#vmctl-image">vmctl image</a></h1>
<p>Manage VM disk images.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl image &lt;SUBCOMMAND&gt;
</code></pre>
<h2 id="subcommands"><a class="header" href="#subcommands">Subcommands</a></h2>
<h3 id="vmctl-image-pull"><a class="header" href="#vmctl-image-pull">vmctl image pull</a></h3>
<p>Download an image to the local cache.</p>
<pre><code>vmctl image pull [OPTIONS] &lt;URL&gt;
</code></pre>
<div class="table-wrapper"><table><thead><tr><th>Argument/Option</th><th>Type</th><th>Description</th></tr></thead><tbody>
<tr><td><code>URL</code></td><td>string</td><td>URL to download (positional)</td></tr>
<tr><td><code>--name</code></td><td>string</td><td>Name to save as in the cache</td></tr>
</tbody></table>
</div>
<h3 id="vmctl-image-list"><a class="header" href="#vmctl-image-list">vmctl image list</a></h3>
<p>List cached images.</p>
<pre><code>vmctl image list
</code></pre>
<p>Output:</p>
<pre><code class="language-text">NAME SIZE PATH
noble-server-cloudimg-amd64.img 0.62 GB /home/user/.local/share/vmctl/images/noble-server-cloudimg-amd64.img
</code></pre>
<h3 id="vmctl-image-inspect"><a class="header" href="#vmctl-image-inspect">vmctl image inspect</a></h3>
<p>Show image format and details.</p>
<pre><code>vmctl image inspect &lt;PATH&gt;
</code></pre>
<div class="table-wrapper"><table><thead><tr><th>Argument</th><th>Description</th></tr></thead><tbody>
<tr><td><code>PATH</code></td><td>Path to image file (positional)</td></tr>
</tbody></table>
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<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash"># Download and cache an image
vmctl image pull https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img
# List what's cached
vmctl image list
# Check format of a local image
vmctl image inspect ./my-image.qcow2
</code></pre>
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<h1 id="vmctl-list"><a class="header" href="#vmctl-list">vmctl list</a></h1>
<p>List all registered VMs.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl list
</code></pre>
<h2 id="output"><a class="header" href="#output">Output</a></h2>
<pre><code class="language-text">NAME BACKEND VCPUS MEM NETWORK PID SSH
webserver qemu 2 2048 user 12345 10042
database qemu 4 4096 tap 12346 -
</code></pre>
<div class="table-wrapper"><table><thead><tr><th>Column</th><th>Description</th></tr></thead><tbody>
<tr><td><code>NAME</code></td><td>VM name</td></tr>
<tr><td><code>BACKEND</code></td><td>Hypervisor backend (qemu, propolis, noop)</td></tr>
<tr><td><code>VCPUS</code></td><td>Number of virtual CPUs</td></tr>
<tr><td><code>MEM</code></td><td>Memory in MB</td></tr>
<tr><td><code>NETWORK</code></td><td>Networking mode (user, tap, vnic, none)</td></tr>
<tr><td><code>PID</code></td><td>QEMU process PID (or <code>-</code> if not running)</td></tr>
<tr><td><code>SSH</code></td><td>SSH host port (or <code>-</code> if not available)</td></tr>
</tbody></table>
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<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash">vmctl list
</code></pre>
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<h1 id="vmctl-log"><a class="header" href="#vmctl-log">vmctl log</a></h1>
<p>Show VM console and provision logs.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl log [OPTIONS] &lt;NAME&gt;
</code></pre>
<h2 id="arguments"><a class="header" href="#arguments">Arguments</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Argument</th><th>Description</th></tr></thead><tbody>
<tr><td><code>NAME</code></td><td>VM name (positional)</td></tr>
</tbody></table>
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<h2 id="options"><a class="header" href="#options">Options</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Option</th><th>Type</th><th>Default</th><th>Description</th></tr></thead><tbody>
<tr><td><code>--console</code></td><td>flag</td><td><code>false</code></td><td>Show only console log (boot / cloud-init output)</td></tr>
<tr><td><code>--provision</code></td><td>flag</td><td><code>false</code></td><td>Show only provision log</td></tr>
<tr><td><code>--tail</code>, <code>-n</code></td><td>integer</td><td><code>0</code></td><td>Show the last N lines (0 = all)</td></tr>
</tbody></table>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>By default (no flags), both console and provision logs are shown. The console log captures serial output (boot messages, cloud-init output). The provision log captures stdout/stderr from provisioner runs.</p>
<p>Log files are located in the VM's work directory:</p>
<ul>
<li><code>console.log</code> - Serial console output</li>
<li><code>provision.log</code> - Provisioning output</li>
</ul>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash"># Show all logs
vmctl log myvm
# Show only provision output
vmctl log myvm --provision
# Show last 50 lines of console log
vmctl log myvm --console --tail 50
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./console.html">vmctl console</a>, <a href="./status.html">vmctl status</a></p>
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<h1 id="vmctl-provision"><a class="header" href="#vmctl-provision">vmctl provision</a></h1>
<p>Re-run provisioners on running VMs from VMFile.kdl.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl provision [OPTIONS]
</code></pre>
<h2 id="options"><a class="header" href="#options">Options</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Option</th><th>Type</th><th>Default</th><th>Description</th></tr></thead><tbody>
<tr><td><code>--file</code></td><td>path</td><td></td><td>Path to VMFile.kdl (auto-discovered if omitted)</td></tr>
<tr><td><code>--name</code></td><td>string</td><td></td><td>Only provision a specific VM</td></tr>
</tbody></table>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>Re-runs all provision steps defined in the VMFile on already-running VMs. The VM must be running and have an <code>ssh</code> block in the VMFile.</p>
<p>vmctl waits up to 120 seconds for SSH to become available, then runs each provisioner in sequence, streaming output to the terminal and logging to <code>provision.log</code>.</p>
<p>Useful for iterating on provision scripts without recreating the VM.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash"># Re-provision all VMs
vmctl provision
# Re-provision a specific VM
vmctl provision --name builder
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./up.html">vmctl up</a>, <a href="./reload.html">vmctl reload</a></p>
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<h1 id="vmctl-reload"><a class="header" href="#vmctl-reload">vmctl reload</a></h1>
<p>Destroy and recreate VMs from VMFile.kdl.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl reload [OPTIONS]
</code></pre>
<h2 id="options"><a class="header" href="#options">Options</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Option</th><th>Type</th><th>Default</th><th>Description</th></tr></thead><tbody>
<tr><td><code>--file</code></td><td>path</td><td></td><td>Path to VMFile.kdl (auto-discovered if omitted)</td></tr>
<tr><td><code>--name</code></td><td>string</td><td></td><td>Only reload a specific VM</td></tr>
<tr><td><code>--no-provision</code></td><td>flag</td><td><code>false</code></td><td>Skip provisioning after reload</td></tr>
</tbody></table>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>For each VM: destroys the existing instance (if any), then creates, starts, and provisions a fresh VM from the current VMFile definition. Useful when you've changed the VMFile and want a clean slate.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash"># Reload all VMs
vmctl reload
# Reload a specific VM
vmctl reload --name webserver
# Reload without provisioning
vmctl reload --no-provision
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./up.html">vmctl up</a>, <a href="./down.html">vmctl down</a></p>
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<h1 id="vmctl-resume"><a class="header" href="#vmctl-resume">vmctl resume</a></h1>
<p>Resume a suspended VM.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl resume &lt;NAME&gt;
</code></pre>
<h2 id="arguments"><a class="header" href="#arguments">Arguments</a></h2>
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<tr><td><code>NAME</code></td><td>VM name (positional)</td></tr>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>Resumes a VM that was paused with <code>vmctl suspend</code>. The VM continues from exactly where it left off.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash">vmctl resume myvm
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./suspend.html">vmctl suspend</a></p>
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<h1 id="vmctl-ssh"><a class="header" href="#vmctl-ssh">vmctl ssh</a></h1>
<p>SSH into a VM.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl ssh [OPTIONS] [NAME]
</code></pre>
<h2 id="arguments"><a class="header" href="#arguments">Arguments</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Argument</th><th>Description</th></tr></thead><tbody>
<tr><td><code>NAME</code></td><td>VM name (optional; inferred from VMFile.kdl if only one VM is defined)</td></tr>
</tbody></table>
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<h2 id="options"><a class="header" href="#options">Options</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Option</th><th>Type</th><th>Description</th></tr></thead><tbody>
<tr><td><code>--user</code></td><td>string</td><td>SSH username (overrides VMFile)</td></tr>
<tr><td><code>--key</code></td><td>path</td><td>Path to SSH private key</td></tr>
<tr><td><code>--file</code></td><td>path</td><td>Path to VMFile.kdl (for reading ssh user)</td></tr>
</tbody></table>
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<h2 id="key-resolution"><a class="header" href="#key-resolution">Key Resolution</a></h2>
<p>vmctl searches for a private key in this order:</p>
<ol>
<li>Auto-generated key in VM's work directory (<code>id_ed25519_generated</code>)</li>
<li>Key specified with <code>--key</code></li>
<li><code>~/.ssh/id_ed25519</code></li>
<li><code>~/.ssh/id_ecdsa</code></li>
<li><code>~/.ssh/id_rsa</code></li>
</ol>
<h2 id="user-resolution"><a class="header" href="#user-resolution">User Resolution</a></h2>
<ol>
<li><code>--user</code> CLI flag</li>
<li><code>user</code> field in VMFile's <code>ssh</code> block</li>
<li>Default: <code>"vm"</code></li>
</ol>
<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>vmctl first verifies SSH connectivity using libssh2 (with a 30-second retry timeout), then hands off to the system <code>ssh</code> binary for full interactive terminal support. SSH options <code>StrictHostKeyChecking=no</code> and <code>UserKnownHostsFile=/dev/null</code> are set automatically.</p>
<p>For user-mode networking, vmctl connects to <code>127.0.0.1</code> on the forwarded host port. For TAP networking, it discovers the guest IP via ARP.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash"># SSH into the only VM in VMFile.kdl
vmctl ssh
# SSH into a specific VM
vmctl ssh myvm
# Override user and key
vmctl ssh myvm --user root --key ~/.ssh/special_key
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./console.html">vmctl console</a></p>
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<h1 id="vmctl-start"><a class="header" href="#vmctl-start">vmctl start</a></h1>
<p>Start an existing VM.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl start &lt;NAME&gt;
</code></pre>
<h2 id="arguments"><a class="header" href="#arguments">Arguments</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Argument</th><th>Description</th></tr></thead><tbody>
<tr><td><code>NAME</code></td><td>VM name (positional)</td></tr>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>Starts a VM that is in the <code>Prepared</code> or <code>Stopped</code> state. The VM must have been previously created with <code>vmctl create</code> or <code>vmctl up</code>.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash">vmctl start myvm
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./stop.html">vmctl stop</a>, <a href="./create.html">vmctl create</a></p>
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<h1 id="vmctl-status"><a class="header" href="#vmctl-status">vmctl status</a></h1>
<p>Show detailed status of a VM.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl status &lt;NAME&gt;
</code></pre>
<h2 id="arguments"><a class="header" href="#arguments">Arguments</a></h2>
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<tr><td><code>NAME</code></td><td>VM name (positional)</td></tr>
</tbody></table>
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<h2 id="output"><a class="header" href="#output">Output</a></h2>
<p>Displays all known information about the VM:</p>
<ul>
<li>Name, ID, Backend, State</li>
<li>vCPUs, Memory, Disk</li>
<li>Network configuration (mode, bridge name)</li>
<li>Work directory path</li>
<li>Overlay path, Seed ISO path</li>
<li>PID, VNC address</li>
<li>SSH port, MAC address</li>
</ul>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash">vmctl status myvm
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./list.html">vmctl list</a></p>
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<h1 id="vmctl-stop"><a class="header" href="#vmctl-stop">vmctl stop</a></h1>
<p>Stop a running VM.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl stop [OPTIONS] &lt;NAME&gt;
</code></pre>
<h2 id="arguments"><a class="header" href="#arguments">Arguments</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Argument</th><th>Description</th></tr></thead><tbody>
<tr><td><code>NAME</code></td><td>VM name (positional)</td></tr>
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<h2 id="options"><a class="header" href="#options">Options</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Option</th><th>Type</th><th>Default</th><th>Description</th></tr></thead><tbody>
<tr><td><code>--timeout</code></td><td>integer</td><td><code>30</code></td><td>Graceful shutdown timeout in seconds</td></tr>
</tbody></table>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>Sends an ACPI power-down signal via QMP. If the guest doesn't shut down within the timeout, vmctl sends SIGTERM to the QEMU process, then SIGKILL as a last resort.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash"># Stop with default 30-second timeout
vmctl stop myvm
# Give it more time to shut down gracefully
vmctl stop myvm --timeout 120
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./start.html">vmctl start</a>, <a href="./destroy.html">vmctl destroy</a></p>
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<h1 id="vmctl-suspend"><a class="header" href="#vmctl-suspend">vmctl suspend</a></h1>
<p>Suspend (pause) a running VM.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl suspend &lt;NAME&gt;
</code></pre>
<h2 id="arguments"><a class="header" href="#arguments">Arguments</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Argument</th><th>Description</th></tr></thead><tbody>
<tr><td><code>NAME</code></td><td>VM name (positional)</td></tr>
</tbody></table>
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<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>Pauses the VM's vCPUs via QMP. The VM remains in memory but stops executing. Use <code>vmctl resume</code> to continue.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash">vmctl suspend myvm
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./resume.html">vmctl resume</a></p>
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<h1 id="vmctl-up"><a class="header" href="#vmctl-up">vmctl up</a></h1>
<p>Bring up VMs defined in VMFile.kdl.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl up [OPTIONS]
</code></pre>
<h2 id="options"><a class="header" href="#options">Options</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Option</th><th>Type</th><th>Default</th><th>Description</th></tr></thead><tbody>
<tr><td><code>--file</code></td><td>path</td><td></td><td>Path to VMFile.kdl (auto-discovered if omitted)</td></tr>
<tr><td><code>--name</code></td><td>string</td><td></td><td>Only bring up a specific VM</td></tr>
<tr><td><code>--no-provision</code></td><td>flag</td><td><code>false</code></td><td>Skip provisioning steps</td></tr>
</tbody></table>
</div>
<h2 id="details"><a class="header" href="#details">Details</a></h2>
<p>For each VM in the VMFile:</p>
<ol>
<li>If the VM is <strong>already running</strong>, it is skipped.</li>
<li>If the VM exists but is <strong>stopped</strong>, it is restarted and re-provisioned.</li>
<li>If the VM <strong>doesn't exist</strong>, it is created, started, and provisioned.</li>
</ol>
<p>Images are downloaded and cached as needed. SSH keys are auto-generated when cloud-init is configured without an explicit key.</p>
<h2 id="examples"><a class="header" href="#examples">Examples</a></h2>
<pre><code class="language-bash"># Bring up all VMs in ./VMFile.kdl
vmctl up
# Bring up a specific VM
vmctl up --name webserver
# Bring up without provisioning
vmctl up --no-provision
# Use a specific VMFile
vmctl up --file path/to/VMFile.kdl
</code></pre>
<h2 id="see-also"><a class="header" href="#see-also">See Also</a></h2>
<p><a href="./down.html">vmctl down</a>, <a href="./reload.html">vmctl reload</a></p>
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<h1 id="vmctl"><a class="header" href="#vmctl">vmctl</a></h1>
<p>The main entry point for the vmctl CLI.</p>
<h2 id="synopsis"><a class="header" href="#synopsis">Synopsis</a></h2>
<pre><code>vmctl &lt;COMMAND&gt;
</code></pre>
<h2 id="commands"><a class="header" href="#commands">Commands</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Command</th><th>Description</th></tr></thead><tbody>
<tr><td><code>create</code></td><td>Create a new VM</td></tr>
<tr><td><code>start</code></td><td>Start an existing VM</td></tr>
<tr><td><code>stop</code></td><td>Stop a running VM</td></tr>
<tr><td><code>destroy</code></td><td>Destroy a VM and clean up resources</td></tr>
<tr><td><code>list</code></td><td>List all VMs</td></tr>
<tr><td><code>status</code></td><td>Show detailed VM status</td></tr>
<tr><td><code>console</code></td><td>Attach to serial console</td></tr>
<tr><td><code>ssh</code></td><td>SSH into a VM</td></tr>
<tr><td><code>suspend</code></td><td>Suspend (pause) a running VM</td></tr>
<tr><td><code>resume</code></td><td>Resume a suspended VM</td></tr>
<tr><td><code>image</code></td><td>Manage VM images</td></tr>
<tr><td><code>up</code></td><td>Bring up VMs from VMFile.kdl</td></tr>
<tr><td><code>down</code></td><td>Bring down VMs from VMFile.kdl</td></tr>
<tr><td><code>reload</code></td><td>Destroy and recreate VMs from VMFile.kdl</td></tr>
<tr><td><code>provision</code></td><td>Re-run provisioners from VMFile.kdl</td></tr>
<tr><td><code>log</code></td><td>Show VM logs</td></tr>
</tbody></table>
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<h2 id="environment-variables"><a class="header" href="#environment-variables">Environment Variables</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Variable</th><th>Description</th></tr></thead><tbody>
<tr><td><code>RUST_LOG</code></td><td>Control log verbosity (e.g., <code>RUST_LOG=debug vmctl up</code>)</td></tr>
<tr><td><code>XDG_DATA_HOME</code></td><td>Override data directory (default: <code>~/.local/share</code>)</td></tr>
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<h1 id="cloud-init-and-ssh-keys"><a class="header" href="#cloud-init-and-ssh-keys">Cloud-Init and SSH Keys</a></h1>
<p>vmctl uses <a href="https://cloud-init.io/">cloud-init</a> to configure guests on first boot. It generates a NoCloud seed ISO containing user-data and meta-data, which the guest's cloud-init agent picks up automatically.</p>
<h2 id="ssh-key-modes"><a class="header" href="#ssh-key-modes">SSH Key Modes</a></h2>
<p>There are three ways to get SSH access to a VM:</p>
<h3 id="1-auto-generated-keypair-recommended"><a class="header" href="#1-auto-generated-keypair-recommended">1. Auto-Generated Keypair (Recommended)</a></h3>
<p>When you define a <code>cloud-init</code> block without an explicit <code>ssh-key</code>, vmctl generates a per-VM Ed25519 keypair:</p>
<pre><code class="language-kdl">cloud-init {
hostname "myvm"
}
ssh {
user "ubuntu"
}
</code></pre>
<p>The keys are stored in the VM's work directory:</p>
<ul>
<li><code>~/.local/share/vmctl/vms/&lt;name&gt;/id_ed25519_generated</code> (private)</li>
<li><code>~/.local/share/vmctl/vms/&lt;name&gt;/id_ed25519_generated.pub</code> (public)</li>
</ul>
<p>This is the simplest option. No key management required.</p>
<h3 id="2-explicit-ssh-key"><a class="header" href="#2-explicit-ssh-key">2. Explicit SSH Key</a></h3>
<p>Point to your own public key file:</p>
<pre><code class="language-kdl">cloud-init {
ssh-key "~/.ssh/id_ed25519.pub"
}
ssh {
user "ubuntu"
private-key "~/.ssh/id_ed25519"
}
</code></pre>
<h3 id="3-raw-user-data"><a class="header" href="#3-raw-user-data">3. Raw User-Data</a></h3>
<p>Provide a complete cloud-config YAML file for full control:</p>
<pre><code class="language-kdl">cloud-init {
user-data "./my-cloud-config.yaml"
}
</code></pre>
<p>In this mode, you're responsible for setting up SSH access yourself in the user-data.</p>
<h2 id="ssh-key-resolution"><a class="header" href="#ssh-key-resolution">SSH Key Resolution</a></h2>
<p>When vmctl needs to SSH into a VM (for <code>vmctl ssh</code> or provisioning), it searches for a private key in this order:</p>
<ol>
<li>Generated key in the VM's work directory (<code>id_ed25519_generated</code>)</li>
<li>Key specified with <code>--key</code> flag or <code>private-key</code> in VMFile ssh block</li>
<li>Standard keys in <code>~/.ssh/</code>: <code>id_ed25519</code>, <code>id_ecdsa</code>, <code>id_rsa</code></li>
</ol>
<h2 id="ssh-user-resolution"><a class="header" href="#ssh-user-resolution">SSH User Resolution</a></h2>
<ol>
<li><code>--user</code> CLI flag</li>
<li><code>user</code> in VMFile <code>ssh</code> block</li>
<li>Default: <code>"vm"</code></li>
</ol>
<h2 id="cloud-init-user-setup"><a class="header" href="#cloud-init-user-setup">Cloud-Init User Setup</a></h2>
<p>When vmctl generates the cloud-config, it creates a user with:</p>
<ul>
<li>The specified username</li>
<li>Passwordless <code>sudo</code> access</li>
<li>The SSH public key in <code>authorized_keys</code></li>
<li>Bash as the default shell</li>
<li>Root login disabled</li>
</ul>
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<h1 id="how-vmctl-works"><a class="header" href="#how-vmctl-works">How vmctl Works</a></h1>
<h2 id="state-directory"><a class="header" href="#state-directory">State Directory</a></h2>
<p>vmctl stores all VM state under <code>$XDG_DATA_HOME/vmctl/</code> (typically <code>~/.local/share/vmctl/</code>):</p>
<pre><code>~/.local/share/vmctl/
vms.json # VM registry (name -&gt; handle mapping)
images/ # Downloaded image cache
vms/
&lt;vm-name&gt;/ # Per-VM working directory
overlay.qcow2 # Copy-on-write disk overlay
seed.iso # Cloud-init NoCloud ISO
qmp.sock # QEMU Machine Protocol socket
console.sock # Serial console socket
console.log # Boot/cloud-init log
provision.log # Provisioning output log
id_ed25519_generated # Auto-generated SSH private key
id_ed25519_generated.pub # Auto-generated SSH public key
pidfile # QEMU process PID
</code></pre>
<h2 id="qcow2-overlays"><a class="header" href="#qcow2-overlays">QCOW2 Overlays</a></h2>
<p>vmctl never modifies the base image directly. Instead, it creates a QCOW2 copy-on-write overlay on top of the original. This means:</p>
<ul>
<li>Multiple VMs can share the same base image.</li>
<li>The base image stays clean in the cache.</li>
<li>Destroying a VM just deletes the overlay.</li>
</ul>
<p>If you specify <code>disk</code> in your VMFile, the overlay is resized to that size and the guest filesystem can be grown.</p>
<h2 id="routerhypervisor"><a class="header" href="#routerhypervisor">RouterHypervisor</a></h2>
<p>All hypervisor operations go through a <code>RouterHypervisor</code> that dispatches to the appropriate backend based on the platform:</p>
<ul>
<li><strong>Linux</strong> -&gt; <code>QemuBackend</code></li>
<li><strong>illumos</strong> -&gt; <code>PropolisBackend</code></li>
<li><strong>Testing</strong> -&gt; <code>NoopBackend</code></li>
</ul>
<p>Each backend implements the same <code>Hypervisor</code> trait, so the CLI code is platform-agnostic.</p>
<h2 id="the-up-flow"><a class="header" href="#the-up-flow">The Up Flow</a></h2>
<p>When you run <code>vmctl up</code>, the following happens for each VM defined in <code>VMFile.kdl</code>:</p>
<ol>
<li><strong>Parse</strong> - Read and validate the VMFile.</li>
<li><strong>Resolve</strong> - Download images (if URL), generate SSH keys (if cloud-init enabled), resolve paths.</li>
<li><strong>Prepare</strong> - Create work directory, QCOW2 overlay, cloud-init seed ISO, allocate MAC address and SSH port.</li>
<li><strong>Start</strong> - Launch QEMU with the correct arguments, wait for QMP socket.</li>
<li><strong>Provision</strong> - Wait for SSH to become available (up to 120 seconds), then run each provisioner in order.</li>
</ol>
<p>If a VM is already running, <code>vmctl up</code> skips it. If it's stopped, it restarts and re-provisions.</p>
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<h1 id="image-management"><a class="header" href="#image-management">Image Management</a></h1>
<p>vmctl can work with local disk images or download them from URLs. Downloaded images are cached for reuse.</p>
<h2 id="image-cache"><a class="header" href="#image-cache">Image Cache</a></h2>
<p>Downloaded images are stored in <code>~/.local/share/vmctl/images/</code>. If an image already exists in the cache, it won't be re-downloaded.</p>
<h2 id="supported-formats"><a class="header" href="#supported-formats">Supported Formats</a></h2>
<p>vmctl uses <code>qemu-img</code> to detect and convert image formats. Common formats:</p>
<ul>
<li><strong>qcow2</strong> - QEMU's native format, supports snapshots and compression.</li>
<li><strong>raw</strong> - Plain disk image.</li>
</ul>
<p>The format is auto-detected from the file header.</p>
<h2 id="zstd-decompression"><a class="header" href="#zstd-decompression">Zstd Decompression</a></h2>
<p>If a URL ends in <code>.zst</code> or <code>.zstd</code>, vmctl automatically decompresses the image after downloading. This is common for distribution cloud images.</p>
<h2 id="overlay-system"><a class="header" href="#overlay-system">Overlay System</a></h2>
<p>vmctl never boots from the base image directly. Instead:</p>
<ol>
<li>The base image is stored in the cache (or at a local path you provide).</li>
<li>A QCOW2 overlay is created on top, pointing to the base as a backing file.</li>
<li>All writes go to the overlay. The base stays untouched.</li>
<li>Destroying a VM just removes the overlay.</li>
</ol>
<p>This means multiple VMs can share the same base image efficiently.</p>
<h2 id="disk-resizing"><a class="header" href="#disk-resizing">Disk Resizing</a></h2>
<p>If you specify <code>disk</code> (in GB) in your VMFile or <code>--disk</code> on the CLI, the overlay is created with that size. The guest OS can then grow its filesystem to fill the available space (most cloud images do this automatically via cloud-init's <code>growpart</code> module).</p>
<h2 id="managing-images-with-the-cli"><a class="header" href="#managing-images-with-the-cli">Managing Images with the CLI</a></h2>
<pre><code class="language-bash"># Download an image to the cache
vmctl image pull https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img
# List cached images
vmctl image list
# Inspect a local image
vmctl image inspect ./my-image.qcow2
</code></pre>
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<h1 id="imperative-vs-declarative"><a class="header" href="#imperative-vs-declarative">Imperative vs Declarative</a></h1>
<p>vmctl supports two workflows for managing VMs.</p>
<h2 id="imperative"><a class="header" href="#imperative">Imperative</a></h2>
<p>Use individual commands to create, configure, and manage VMs step by step:</p>
<pre><code class="language-bash">vmctl create --name myvm --image-url https://example.com/image.img --vcpus 2 --memory 2048 --start
vmctl ssh myvm
vmctl stop myvm
vmctl destroy myvm
</code></pre>
<p>This is useful for:</p>
<ul>
<li>Quick one-off VMs</li>
<li>Experimenting with different images</li>
<li>Scripting custom workflows</li>
</ul>
<h2 id="declarative"><a class="header" href="#declarative">Declarative</a></h2>
<p>Define your VMs in a <code>VMFile.kdl</code> and let vmctl converge to the desired state:</p>
<pre><code class="language-kdl">vm "myvm" {
image-url "https://example.com/image.img"
vcpus 2
memory 2048
cloud-init {
hostname "myvm"
}
ssh {
user "ubuntu"
}
provision "shell" {
inline "echo hello"
}
}
</code></pre>
<pre><code class="language-bash">vmctl up # create + start + provision
vmctl down # stop
vmctl reload # destroy + recreate + provision
vmctl provision # re-run provisioners only
</code></pre>
<p>This is useful for:</p>
<ul>
<li>Reproducible development environments</li>
<li>Multi-VM setups</li>
<li>Checked-in VM definitions alongside your project</li>
<li>Complex provisioning workflows</li>
</ul>
<h2 id="when-to-use-which"><a class="header" href="#when-to-use-which">When to Use Which</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Scenario</th><th>Approach</th></tr></thead><tbody>
<tr><td>"I need a quick VM to test something"</td><td>Imperative</td></tr>
<tr><td>"My project needs a build VM with specific packages"</td><td>Declarative</td></tr>
<tr><td>"I want to script VM lifecycle in CI"</td><td>Either, depending on complexity</td></tr>
<tr><td>"Multiple VMs that work together"</td><td>Declarative</td></tr>
</tbody></table>
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<h1 id="networking-modes"><a class="header" href="#networking-modes">Networking Modes</a></h1>
<p>vmctl supports several networking modes depending on your needs and permissions.</p>
<h2 id="user-mode-slirp---default"><a class="header" href="#user-mode-slirp---default">User Mode (SLIRP) - Default</a></h2>
<pre><code class="language-kdl">network "user"
</code></pre>
<p>QEMU's built-in user-mode networking. No root or special permissions required.</p>
<p><strong>How it works:</strong></p>
<ul>
<li>QEMU emulates a full TCP/IP stack in userspace.</li>
<li>The guest gets a private IP (typically <code>10.0.2.x</code>).</li>
<li>Outbound connections from the guest are NAT'd through the host.</li>
<li>SSH access is provided via host port forwarding (ports 10022-10122, deterministically assigned per VM name).</li>
</ul>
<p><strong>Pros:</strong> Zero setup, no root needed.
<strong>Cons:</strong> No inbound connections (except forwarded ports), lower performance than TAP.</p>
<h2 id="tap-mode"><a class="header" href="#tap-mode">TAP Mode</a></h2>
<pre><code class="language-kdl">network "tap" {
bridge "br0"
}
</code></pre>
<p>Creates a TAP device and attaches it to a host bridge. The guest appears as a real machine on the bridge's network.</p>
<p><strong>How it works:</strong></p>
<ul>
<li>vmctl creates a TAP interface and bridges it.</li>
<li>The guest gets an IP via DHCP from whatever serves the bridge network.</li>
<li>Full Layer 2 connectivity.</li>
</ul>
<p><strong>Pros:</strong> Real network presence, full inbound/outbound, better performance.
<strong>Cons:</strong> Requires bridge setup, may need root or appropriate capabilities.</p>
<p>If no bridge name is specified, it defaults to <code>br0</code>.</p>
<h2 id="vnic-mode-illumos-only"><a class="header" href="#vnic-mode-illumos-only">VNIC Mode (illumos only)</a></h2>
<pre><code class="language-kdl">network "vnic" {
name "vnic0"
}
</code></pre>
<p>Uses an illumos VNIC for exclusive-IP zone networking. Only available on the Propolis backend.</p>
<h2 id="none"><a class="header" href="#none">None</a></h2>
<pre><code class="language-kdl">network "none"
</code></pre>
<p>No networking at all. Useful for isolated compute tasks or testing.</p>
<h2 id="ip-discovery"><a class="header" href="#ip-discovery">IP Discovery</a></h2>
<p>vmctl discovers the guest IP differently depending on the network mode:</p>
<div class="table-wrapper"><table><thead><tr><th>Mode</th><th>IP Discovery Method</th></tr></thead><tbody>
<tr><td>User</td><td>Returns <code>127.0.0.1</code> (SSH via forwarded port)</td></tr>
<tr><td>TAP</td><td>Parses ARP table (<code>ip neigh show</code>), falls back to dnsmasq lease files by MAC address</td></tr>
<tr><td>VNIC</td><td>Zone-based discovery</td></tr>
<tr><td>None</td><td>Not available</td></tr>
</tbody></table>
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<h1 class="menu-title">vmctl Documentation</h1>
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<h1 id="vm-lifecycle"><a class="header" href="#vm-lifecycle">VM Lifecycle</a></h1>
<p>Every VM in vmctl moves through a set of well-defined states.</p>
<h2 id="states"><a class="header" href="#states">States</a></h2>
<div class="table-wrapper"><table><thead><tr><th>State</th><th>Description</th></tr></thead><tbody>
<tr><td><code>Preparing</code></td><td>Backend is allocating resources (overlay, ISO, sockets)</td></tr>
<tr><td><code>Prepared</code></td><td>Resources allocated, ready to boot</td></tr>
<tr><td><code>Running</code></td><td>VM is booted and executing</td></tr>
<tr><td><code>Stopped</code></td><td>VM has been shut down (gracefully or forcibly)</td></tr>
<tr><td><code>Failed</code></td><td>An error occurred during a lifecycle operation</td></tr>
<tr><td><code>Destroyed</code></td><td>VM and all its resources have been cleaned up</td></tr>
</tbody></table>
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<h2 id="transitions"><a class="header" href="#transitions">Transitions</a></h2>
<pre><code class="language-text"> prepare() start()
[new] ──────────&gt; Prepared ──────────&gt; Running
│ │
suspend() │ │ stop(timeout)
┌────────────┘ └──────────────┐
v v
Suspended ─── resume() ──&gt; Stopped
start() │
Running &lt;──────────┘
Any state ── destroy() ──&gt; Destroyed
</code></pre>
<h2 id="commands-and-transitions"><a class="header" href="#commands-and-transitions">Commands and Transitions</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Command</th><th>From State</th><th>To State</th></tr></thead><tbody>
<tr><td><code>vmctl create</code></td><td>(none)</td><td>Prepared</td></tr>
<tr><td><code>vmctl start</code></td><td>Prepared, Stopped</td><td>Running</td></tr>
<tr><td><code>vmctl stop</code></td><td>Running</td><td>Stopped</td></tr>
<tr><td><code>vmctl suspend</code></td><td>Running</td><td>Suspended (paused vCPUs)</td></tr>
<tr><td><code>vmctl resume</code></td><td>Suspended</td><td>Running</td></tr>
<tr><td><code>vmctl destroy</code></td><td>Any</td><td>Destroyed</td></tr>
<tr><td><code>vmctl up</code></td><td>(none), Stopped</td><td>Running (auto-creates if needed)</td></tr>
<tr><td><code>vmctl down</code></td><td>Running</td><td>Stopped</td></tr>
<tr><td><code>vmctl reload</code></td><td>Any</td><td>Running (destroys + recreates)</td></tr>
</tbody></table>
</div>
<h2 id="graceful-shutdown"><a class="header" href="#graceful-shutdown">Graceful Shutdown</a></h2>
<p><code>vmctl stop</code> sends an ACPI power-down signal via QMP. If the guest doesn't shut down within the timeout (default 30 seconds), vmctl sends SIGTERM, and finally SIGKILL as a last resort.</p>
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flex-direction: column;
align-items: center;
background-color: var(--bg);
color: var(--fg);
border-width: 1px;
border-color: var(--theme-popup-border);
border-style: solid;
border-radius: 8px;
padding: 10px;
}
.mdbook-help-title {
text-align: center;
/* mdbook's margin for h2 is way too large. */
margin: 10px;
}

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@ -1,280 +0,0 @@
/* Base styles and content styles */
:root {
/* Browser default font-size is 16px, this way 1 rem = 10px */
font-size: 62.5%;
color-scheme: var(--color-scheme);
}
html {
font-family: "Open Sans", sans-serif;
color: var(--fg);
background-color: var(--bg);
text-size-adjust: none;
-webkit-text-size-adjust: none;
}
body {
margin: 0;
font-size: 1.6rem;
overflow-x: hidden;
}
code {
font-family: var(--mono-font) !important;
font-size: var(--code-font-size);
direction: ltr !important;
}
/* make long words/inline code not x overflow */
main {
overflow-wrap: break-word;
}
/* make wide tables scroll if they overflow */
.table-wrapper {
overflow-x: auto;
}
/* Don't change font size in headers. */
h1 code, h2 code, h3 code, h4 code, h5 code, h6 code {
font-size: unset;
}
.left { float: left; }
.right { float: right; }
.boring { opacity: 0.6; }
.hide-boring .boring { display: none; }
.hidden { display: none !important; }
h2, h3 { margin-block-start: 2.5em; }
h4, h5 { margin-block-start: 2em; }
.header + .header h3,
.header + .header h4,
.header + .header h5 {
margin-block-start: 1em;
}
h1:target::before,
h2:target::before,
h3:target::before,
h4:target::before,
h5:target::before,
h6:target::before {
display: inline-block;
content: "»";
margin-inline-start: -30px;
width: 30px;
}
/* This is broken on Safari as of version 14, but is fixed
in Safari Technology Preview 117 which I think will be Safari 14.2.
https://bugs.webkit.org/show_bug.cgi?id=218076
*/
:target {
/* Safari does not support logical properties */
scroll-margin-top: calc(var(--menu-bar-height) + 0.5em);
}
.page {
outline: 0;
padding: 0 var(--page-padding);
margin-block-start: calc(0px - var(--menu-bar-height)); /* Compensate for the #menu-bar-hover-placeholder */
}
.page-wrapper {
box-sizing: border-box;
background-color: var(--bg);
}
html:not(.js) .page-wrapper,
.js:not(.sidebar-resizing) .page-wrapper {
transition: margin-left 0.3s ease, transform 0.3s ease; /* Animation: slide away */
}
[dir=rtl]:not(.js) .page-wrapper,
[dir=rtl].js:not(.sidebar-resizing) .page-wrapper {
transition: margin-right 0.3s ease, transform 0.3s ease; /* Animation: slide away */
}
.content {
overflow-y: auto;
padding: 0 5px 50px 5px;
}
.content main {
margin-inline-start: auto;
margin-inline-end: auto;
max-width: var(--content-max-width);
}
.content p { line-height: 1.45em; }
.content ol { line-height: 1.45em; }
.content ul { line-height: 1.45em; }
.content a { text-decoration: none; }
.content a:hover { text-decoration: underline; }
.content img, .content video { max-width: 100%; }
.content .header:link,
.content .header:visited {
color: var(--fg);
}
.content .header:link,
.content .header:visited:hover {
text-decoration: none;
}
table {
margin: 0 auto;
border-collapse: collapse;
}
table td {
padding: 3px 20px;
border: 1px var(--table-border-color) solid;
}
table thead {
background: var(--table-header-bg);
}
table thead td {
font-weight: 700;
border: none;
}
table thead th {
padding: 3px 20px;
}
table thead tr {
border: 1px var(--table-header-bg) solid;
}
/* Alternate background colors for rows */
table tbody tr:nth-child(2n) {
background: var(--table-alternate-bg);
}
blockquote {
margin: 20px 0;
padding: 0 20px;
color: var(--fg);
background-color: var(--quote-bg);
border-block-start: .1em solid var(--quote-border);
border-block-end: .1em solid var(--quote-border);
}
.warning {
margin: 20px;
padding: 0 20px;
border-inline-start: 2px solid var(--warning-border);
}
.warning:before {
position: absolute;
width: 3rem;
height: 3rem;
margin-inline-start: calc(-1.5rem - 21px);
content: "ⓘ";
text-align: center;
background-color: var(--bg);
color: var(--warning-border);
font-weight: bold;
font-size: 2rem;
}
blockquote .warning:before {
background-color: var(--quote-bg);
}
kbd {
background-color: var(--table-border-color);
border-radius: 4px;
border: solid 1px var(--theme-popup-border);
box-shadow: inset 0 -1px 0 var(--theme-hover);
display: inline-block;
font-size: var(--code-font-size);
font-family: var(--mono-font);
line-height: 10px;
padding: 4px 5px;
vertical-align: middle;
}
sup {
/* Set the line-height for superscript and footnote references so that there
isn't an awkward space appearing above lines that contain the footnote.
See https://github.com/rust-lang/mdBook/pull/2443#discussion_r1813773583
for an explanation.
*/
line-height: 0;
}
.footnote-definition {
font-size: 0.9em;
}
/* The default spacing for a list is a little too large. */
.footnote-definition ul,
.footnote-definition ol {
padding-left: 20px;
}
.footnote-definition > li {
/* Required to position the ::before target */
position: relative;
}
.footnote-definition > li:target {
scroll-margin-top: 50vh;
}
.footnote-reference:target {
scroll-margin-top: 50vh;
}
/* Draws a border around the footnote (including the marker) when it is selected.
TODO: If there are multiple linkbacks, highlight which one you just came
from so you know which one to click.
*/
.footnote-definition > li:target::before {
border: 2px solid var(--footnote-highlight);
border-radius: 6px;
position: absolute;
top: -8px;
right: -8px;
bottom: -8px;
left: -32px;
pointer-events: none;
content: "";
}
/* Pulses the footnote reference so you can quickly see where you left off reading.
This could use some improvement.
*/
@media not (prefers-reduced-motion) {
.footnote-reference:target {
animation: fn-highlight 0.8s;
border-radius: 2px;
}
@keyframes fn-highlight {
from {
background-color: var(--footnote-highlight);
}
}
}
.tooltiptext {
position: absolute;
visibility: hidden;
color: #fff;
background-color: #333;
transform: translateX(-50%); /* Center by moving tooltip 50% of its width left */
left: -8px; /* Half of the width of the icon */
top: -35px;
font-size: 0.8em;
text-align: center;
border-radius: 6px;
padding: 5px 8px;
margin: 5px;
z-index: 1000;
}
.tooltipped .tooltiptext {
visibility: visible;
}
.chapter li.part-title {
color: var(--sidebar-fg);
margin: 5px 0px;
font-weight: bold;
}
.result-no-output {
font-style: italic;
}

View file

@ -1,50 +0,0 @@
#sidebar,
#menu-bar,
.nav-chapters,
.mobile-nav-chapters {
display: none;
}
#page-wrapper.page-wrapper {
transform: none !important;
margin-inline-start: 0px;
overflow-y: initial;
}
#content {
max-width: none;
margin: 0;
padding: 0;
}
.page {
overflow-y: initial;
}
code {
direction: ltr !important;
}
pre > .buttons {
z-index: 2;
}
a, a:visited, a:active, a:hover {
color: #4183c4;
text-decoration: none;
}
h1, h2, h3, h4, h5, h6 {
page-break-inside: avoid;
page-break-after: avoid;
}
pre, code {
page-break-inside: avoid;
white-space: pre-wrap;
}
.fa {
display: none !important;
}

View file

@ -1,331 +0,0 @@
/* Globals */
:root {
--sidebar-target-width: 300px;
--sidebar-width: min(var(--sidebar-target-width), 80vw);
--sidebar-resize-indicator-width: 8px;
--sidebar-resize-indicator-space: 2px;
--page-padding: 15px;
--content-max-width: 750px;
--menu-bar-height: 50px;
--mono-font: "Source Code Pro", Consolas, "Ubuntu Mono", Menlo, "DejaVu Sans Mono", monospace, monospace;
--code-font-size: 0.875em; /* please adjust the ace font size accordingly in editor.js */
--searchbar-margin-block-start: 5px;
}
/* Themes */
.ayu {
--bg: hsl(210, 25%, 8%);
--fg: #c5c5c5;
--sidebar-bg: #14191f;
--sidebar-fg: #c8c9db;
--sidebar-non-existant: #5c6773;
--sidebar-active: #ffb454;
--sidebar-spacer: #2d334f;
--scrollbar: var(--sidebar-fg);
--icons: #737480;
--icons-hover: #b7b9cc;
--links: #0096cf;
--inline-code-color: #ffb454;
--theme-popup-bg: #14191f;
--theme-popup-border: #5c6773;
--theme-hover: #191f26;
--quote-bg: hsl(226, 15%, 17%);
--quote-border: hsl(226, 15%, 22%);
--warning-border: #ff8e00;
--table-border-color: hsl(210, 25%, 13%);
--table-header-bg: hsl(210, 25%, 28%);
--table-alternate-bg: hsl(210, 25%, 11%);
--searchbar-border-color: #848484;
--searchbar-bg: #424242;
--searchbar-fg: #fff;
--searchbar-shadow-color: #d4c89f;
--searchresults-header-fg: #666;
--searchresults-border-color: #888;
--searchresults-li-bg: #252932;
--search-mark-bg: #e3b171;
--color-scheme: dark;
/* Same as `--icons` */
--copy-button-filter: invert(45%) sepia(6%) saturate(621%) hue-rotate(198deg) brightness(99%) contrast(85%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(68%) sepia(55%) saturate(531%) hue-rotate(341deg) brightness(104%) contrast(101%);
--footnote-highlight: #2668a6;
--overlay-bg: rgba(33, 40, 48, 0.4);
}
.coal {
--bg: hsl(200, 7%, 8%);
--fg: #98a3ad;
--sidebar-bg: #292c2f;
--sidebar-fg: #a1adb8;
--sidebar-non-existant: #505254;
--sidebar-active: #3473ad;
--sidebar-spacer: #393939;
--scrollbar: var(--sidebar-fg);
--icons: #43484d;
--icons-hover: #b3c0cc;
--links: #2b79a2;
--inline-code-color: #c5c8c6;
--theme-popup-bg: #141617;
--theme-popup-border: #43484d;
--theme-hover: #1f2124;
--quote-bg: hsl(234, 21%, 18%);
--quote-border: hsl(234, 21%, 23%);
--warning-border: #ff8e00;
--table-border-color: hsl(200, 7%, 13%);
--table-header-bg: hsl(200, 7%, 28%);
--table-alternate-bg: hsl(200, 7%, 11%);
--searchbar-border-color: #aaa;
--searchbar-bg: #b7b7b7;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #666;
--searchresults-border-color: #98a3ad;
--searchresults-li-bg: #2b2b2f;
--search-mark-bg: #355c7d;
--color-scheme: dark;
/* Same as `--icons` */
--copy-button-filter: invert(26%) sepia(8%) saturate(575%) hue-rotate(169deg) brightness(87%) contrast(82%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(36%) sepia(70%) saturate(503%) hue-rotate(167deg) brightness(98%) contrast(89%);
--footnote-highlight: #4079ae;
--overlay-bg: rgba(33, 40, 48, 0.4);
}
.light, html:not(.js) {
--bg: hsl(0, 0%, 100%);
--fg: hsl(0, 0%, 0%);
--sidebar-bg: #fafafa;
--sidebar-fg: hsl(0, 0%, 0%);
--sidebar-non-existant: #aaaaaa;
--sidebar-active: #1f1fff;
--sidebar-spacer: #f4f4f4;
--scrollbar: #8F8F8F;
--icons: #747474;
--icons-hover: #000000;
--links: #20609f;
--inline-code-color: #301900;
--theme-popup-bg: #fafafa;
--theme-popup-border: #cccccc;
--theme-hover: #e6e6e6;
--quote-bg: hsl(197, 37%, 96%);
--quote-border: hsl(197, 37%, 91%);
--warning-border: #ff8e00;
--table-border-color: hsl(0, 0%, 95%);
--table-header-bg: hsl(0, 0%, 80%);
--table-alternate-bg: hsl(0, 0%, 97%);
--searchbar-border-color: #aaa;
--searchbar-bg: #fafafa;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #666;
--searchresults-border-color: #888;
--searchresults-li-bg: #e4f2fe;
--search-mark-bg: #a2cff5;
--color-scheme: light;
/* Same as `--icons` */
--copy-button-filter: invert(45.49%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(14%) sepia(93%) saturate(4250%) hue-rotate(243deg) brightness(99%) contrast(130%);
--footnote-highlight: #7e7eff;
--overlay-bg: rgba(200, 200, 205, 0.4);
}
.navy {
--bg: hsl(226, 23%, 11%);
--fg: #bcbdd0;
--sidebar-bg: #282d3f;
--sidebar-fg: #c8c9db;
--sidebar-non-existant: #505274;
--sidebar-active: #2b79a2;
--sidebar-spacer: #2d334f;
--scrollbar: var(--sidebar-fg);
--icons: #737480;
--icons-hover: #b7b9cc;
--links: #2b79a2;
--inline-code-color: #c5c8c6;
--theme-popup-bg: #161923;
--theme-popup-border: #737480;
--theme-hover: #282e40;
--quote-bg: hsl(226, 15%, 17%);
--quote-border: hsl(226, 15%, 22%);
--warning-border: #ff8e00;
--table-border-color: hsl(226, 23%, 16%);
--table-header-bg: hsl(226, 23%, 31%);
--table-alternate-bg: hsl(226, 23%, 14%);
--searchbar-border-color: #aaa;
--searchbar-bg: #aeaec6;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #5f5f71;
--searchresults-border-color: #5c5c68;
--searchresults-li-bg: #242430;
--search-mark-bg: #a2cff5;
--color-scheme: dark;
/* Same as `--icons` */
--copy-button-filter: invert(51%) sepia(10%) saturate(393%) hue-rotate(198deg) brightness(86%) contrast(87%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(46%) sepia(20%) saturate(1537%) hue-rotate(156deg) brightness(85%) contrast(90%);
--footnote-highlight: #4079ae;
--overlay-bg: rgba(33, 40, 48, 0.4);
}
.rust {
--bg: hsl(60, 9%, 87%);
--fg: #262625;
--sidebar-bg: #3b2e2a;
--sidebar-fg: #c8c9db;
--sidebar-non-existant: #505254;
--sidebar-active: #e69f67;
--sidebar-spacer: #45373a;
--scrollbar: var(--sidebar-fg);
--icons: #737480;
--icons-hover: #262625;
--links: #2b79a2;
--inline-code-color: #6e6b5e;
--theme-popup-bg: #e1e1db;
--theme-popup-border: #b38f6b;
--theme-hover: #99908a;
--quote-bg: hsl(60, 5%, 75%);
--quote-border: hsl(60, 5%, 70%);
--warning-border: #ff8e00;
--table-border-color: hsl(60, 9%, 82%);
--table-header-bg: #b3a497;
--table-alternate-bg: hsl(60, 9%, 84%);
--searchbar-border-color: #aaa;
--searchbar-bg: #fafafa;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #666;
--searchresults-border-color: #888;
--searchresults-li-bg: #dec2a2;
--search-mark-bg: #e69f67;
/* Same as `--icons` */
--copy-button-filter: invert(51%) sepia(10%) saturate(393%) hue-rotate(198deg) brightness(86%) contrast(87%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(77%) sepia(16%) saturate(1798%) hue-rotate(328deg) brightness(98%) contrast(83%);
--footnote-highlight: #d3a17a;
--overlay-bg: rgba(150, 150, 150, 0.25);
}
@media (prefers-color-scheme: dark) {
html:not(.js) {
--bg: hsl(200, 7%, 8%);
--fg: #98a3ad;
--sidebar-bg: #292c2f;
--sidebar-fg: #a1adb8;
--sidebar-non-existant: #505254;
--sidebar-active: #3473ad;
--sidebar-spacer: #393939;
--scrollbar: var(--sidebar-fg);
--icons: #43484d;
--icons-hover: #b3c0cc;
--links: #2b79a2;
--inline-code-color: #c5c8c6;
--theme-popup-bg: #141617;
--theme-popup-border: #43484d;
--theme-hover: #1f2124;
--quote-bg: hsl(234, 21%, 18%);
--quote-border: hsl(234, 21%, 23%);
--warning-border: #ff8e00;
--table-border-color: hsl(200, 7%, 13%);
--table-header-bg: hsl(200, 7%, 28%);
--table-alternate-bg: hsl(200, 7%, 11%);
--searchbar-border-color: #aaa;
--searchbar-bg: #b7b7b7;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #666;
--searchresults-border-color: #98a3ad;
--searchresults-li-bg: #2b2b2f;
--search-mark-bg: #355c7d;
--color-scheme: dark;
/* Same as `--icons` */
--copy-button-filter: invert(26%) sepia(8%) saturate(575%) hue-rotate(169deg) brightness(87%) contrast(82%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(36%) sepia(70%) saturate(503%) hue-rotate(167deg) brightness(98%) contrast(89%);
}
}

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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 199.7 184.2">
<style>
@media (prefers-color-scheme: dark) {
svg { fill: white; }
}
</style>
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<!-- Original image Copyright Dave Gandy — CC BY 4.0 License -->

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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
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<h1 id="installation"><a class="header" href="#installation">Installation</a></h1>
<p>vmctl is built from source using Rust's Cargo build system.</p>
<h2 id="requirements"><a class="header" href="#requirements">Requirements</a></h2>
<ul>
<li>Rust 1.85 or later (edition 2024)</li>
<li>A working C compiler (for native dependencies like libssh2)</li>
</ul>
<h2 id="building-from-source"><a class="header" href="#building-from-source">Building from Source</a></h2>
<p>Clone the repository and build the release binary:</p>
<pre><code class="language-bash">git clone https://github.com/user/vm-manager.git
cd vm-manager
cargo build --release -p vmctl
</code></pre>
<p>The binary will be at <code>target/release/vmctl</code>. Copy it somewhere in your <code>$PATH</code>:</p>
<pre><code class="language-bash">sudo cp target/release/vmctl /usr/local/bin/
</code></pre>
<h2 id="feature-flags"><a class="header" href="#feature-flags">Feature Flags</a></h2>
<p>The <code>vm-manager</code> library crate has one optional feature:</p>
<div class="table-wrapper"><table><thead><tr><th>Feature</th><th>Description</th></tr></thead><tbody>
<tr><td><code>pure-iso</code></td><td>Use a pure-Rust ISO 9660 generator (<code>isobemak</code>) instead of shelling out to <code>genisoimage</code>/<code>mkisofs</code>. Useful in minimal or containerized environments.</td></tr>
</tbody></table>
</div>
<p>To build with it:</p>
<pre><code class="language-bash">cargo build --release -p vmctl --features vm-manager/pure-iso
</code></pre>
<h2 id="verify-installation"><a class="header" href="#verify-installation">Verify Installation</a></h2>
<pre><code class="language-bash">vmctl --help
</code></pre>
<p>You should see the list of available subcommands.</p>
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<h1 id="prerequisites"><a class="header" href="#prerequisites">Prerequisites</a></h1>
<p>vmctl requires several system tools depending on the backend and features you use.</p>
<h2 id="linux-qemukvm"><a class="header" href="#linux-qemukvm">Linux (QEMU/KVM)</a></h2>
<h3 id="required"><a class="header" href="#required">Required</a></h3>
<div class="table-wrapper"><table><thead><tr><th>Tool</th><th>Purpose</th><th>Install (Debian/Ubuntu)</th></tr></thead><tbody>
<tr><td><code>qemu-system-x86_64</code></td><td>VM hypervisor</td><td><code>sudo apt install qemu-system-x86</code></td></tr>
<tr><td><code>qemu-img</code></td><td>Disk image operations</td><td><code>sudo apt install qemu-utils</code></td></tr>
<tr><td><code>/dev/kvm</code></td><td>Hardware virtualization</td><td>Kernel module (usually built-in)</td></tr>
</tbody></table>
</div>
<h3 id="cloud-init-iso-generation-one-of"><a class="header" href="#cloud-init-iso-generation-one-of">Cloud-Init ISO Generation (one of)</a></h3>
<div class="table-wrapper"><table><thead><tr><th>Tool</th><th>Purpose</th><th>Install</th></tr></thead><tbody>
<tr><td><code>genisoimage</code></td><td>ISO 9660 image creation</td><td><code>sudo apt install genisoimage</code></td></tr>
<tr><td><code>mkisofs</code></td><td>Alternative ISO tool</td><td><code>sudo apt install mkisofs</code></td></tr>
</tbody></table>
</div>
<p>Or build with the <code>pure-iso</code> feature to avoid needing either.</p>
<h2 id="verify-everything"><a class="header" href="#verify-everything">Verify Everything</a></h2>
<pre><code class="language-bash"># QEMU
qemu-system-x86_64 --version
# qemu-img
qemu-img --version
# KVM access
ls -la /dev/kvm
# ISO tools (one of these)
genisoimage --version 2&gt;/dev/null || mkisofs --version 2&gt;/dev/null
# Your user should be in the kvm group
groups | grep -q kvm &amp;&amp; echo "kvm: OK" || echo "kvm: add yourself to the kvm group"
</code></pre>
<p>If <code>/dev/kvm</code> is not present, enable KVM in your BIOS/UEFI settings (look for "VT-x" or "AMD-V") and ensure the <code>kvm</code> kernel module is loaded:</p>
<pre><code class="language-bash">sudo modprobe kvm
sudo modprobe kvm_intel # or kvm_amd
</code></pre>
<h2 id="illumos-propolis"><a class="header" href="#illumos-propolis">illumos (Propolis)</a></h2>
<p>For the experimental Propolis backend:</p>
<ul>
<li>A running <code>propolis-server</code> instance</li>
<li>ZFS pool (default: <code>rpool</code>)</li>
<li><code>nebula-vm</code> zone brand installed</li>
<li>VNIC networking configured</li>
</ul>
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<h1 id="quick-start"><a class="header" href="#quick-start">Quick Start</a></h1>
<p>This guide walks you through creating your first VM in under a minute.</p>
<h2 id="imperative-one-off"><a class="header" href="#imperative-one-off">Imperative (One-Off)</a></h2>
<p>Create and start a VM from an Ubuntu cloud image:</p>
<pre><code class="language-bash">vmctl create \
--name demo \
--image-url https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img \
--vcpus 2 \
--memory 2048 \
--start
</code></pre>
<p>Wait a moment for the image to download and the VM to boot, then connect:</p>
<pre><code class="language-bash">vmctl ssh demo
</code></pre>
<p>When you're done:</p>
<pre><code class="language-bash">vmctl destroy demo
</code></pre>
<h2 id="declarative-reproducible"><a class="header" href="#declarative-reproducible">Declarative (Reproducible)</a></h2>
<p>Create a <code>VMFile.kdl</code> in your project directory:</p>
<pre><code class="language-kdl">vm "demo" {
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
vcpus 2
memory 2048
cloud-init {
hostname "demo"
}
ssh {
user "ubuntu"
}
}
</code></pre>
<p>Bring it up:</p>
<pre><code class="language-bash">vmctl up
</code></pre>
<p>vmctl will download the image (cached for future use), create a QCOW2 overlay, generate an Ed25519 SSH keypair, build a cloud-init ISO, and boot the VM.</p>
<p>Connect:</p>
<pre><code class="language-bash">vmctl ssh
</code></pre>
<p>Tear it down:</p>
<pre><code class="language-bash">vmctl down
</code></pre>
<p>Or destroy it completely (removes all VM files):</p>
<pre><code class="language-bash">vmctl down --destroy
</code></pre>
<h2 id="next-steps"><a class="header" href="#next-steps">Next Steps</a></h2>
<ul>
<li><a href="../concepts/how-it-works.html">Concepts: How vmctl Works</a> for an understanding of what happens under the hood.</li>
<li><a href="../tutorials/declarative-workflow.html">Tutorials: Declarative Workflow</a> for a complete walkthrough with provisioning.</li>
<li><a href="../vmfile/overview.html">VMFile.kdl Reference</a> for the full configuration format.</li>
</ul>
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<h1 class="menu-title">vmctl Documentation</h1>
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<h1 id="introduction"><a class="header" href="#introduction">Introduction</a></h1>
<p><strong>vmctl</strong> is a command-line tool for creating, managing, and provisioning virtual machines on Linux (QEMU/KVM) and illumos (Propolis/bhyve). It offers both imperative commands for one-off tasks and a declarative configuration format (<code>VMFile.kdl</code>) for reproducible VM environments.</p>
<h2 id="why-vmctl"><a class="header" href="#why-vmctl">Why vmctl?</a></h2>
<p>Managing VMs with raw QEMU commands is tedious and error-prone. vmctl handles the plumbing: disk overlays, cloud-init ISOs, SSH key generation, network configuration, and process lifecycle. You describe <em>what</em> you want; vmctl figures out <em>how</em>.</p>
<p>Think of it like this:</p>
<div class="table-wrapper"><table><thead><tr><th>Docker world</th><th>vmctl world</th></tr></thead><tbody>
<tr><td><code>docker run</code></td><td><code>vmctl create --start</code></td></tr>
<tr><td><code>docker-compose.yml</code></td><td><code>VMFile.kdl</code></td></tr>
<tr><td><code>docker compose up</code></td><td><code>vmctl up</code></td></tr>
<tr><td><code>docker compose down</code></td><td><code>vmctl down</code></td></tr>
</tbody></table>
</div>
<h2 id="a-taste"><a class="header" href="#a-taste">A Taste</a></h2>
<p>Create a <code>VMFile.kdl</code>:</p>
<pre><code class="language-kdl">vm "dev" {
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
vcpus 2
memory 2048
cloud-init {
hostname "dev"
}
ssh {
user "ubuntu"
}
provision "shell" {
inline "sudo apt-get update &amp;&amp; sudo apt-get install -y build-essential"
}
}
</code></pre>
<p>Then:</p>
<pre><code class="language-bash">vmctl up # download image, create VM, boot, provision
vmctl ssh # connect over SSH
vmctl down # shut it down
</code></pre>
<h2 id="platform-support"><a class="header" href="#platform-support">Platform Support</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Platform</th><th>Backend</th><th>Status</th></tr></thead><tbody>
<tr><td>Linux</td><td>QEMU/KVM</td><td>Fully supported</td></tr>
<tr><td>illumos</td><td>Propolis/bhyve</td><td>Experimental</td></tr>
</tbody></table>
</div>
<h2 id="project-structure"><a class="header" href="#project-structure">Project Structure</a></h2>
<p>vmctl is split into two crates:</p>
<ul>
<li><strong>vm-manager</strong> - Library crate with the hypervisor abstraction, image management, SSH, provisioning, and VMFile parsing.</li>
<li><strong>vmctl</strong> - CLI binary built on top of vm-manager.</li>
</ul>
<p>Both live in a Cargo workspace under <code>crates/</code>.</p>
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<h1 id="introduction"><a class="header" href="#introduction">Introduction</a></h1>
<p><strong>vmctl</strong> is a command-line tool for creating, managing, and provisioning virtual machines on Linux (QEMU/KVM) and illumos (Propolis/bhyve). It offers both imperative commands for one-off tasks and a declarative configuration format (<code>VMFile.kdl</code>) for reproducible VM environments.</p>
<h2 id="why-vmctl"><a class="header" href="#why-vmctl">Why vmctl?</a></h2>
<p>Managing VMs with raw QEMU commands is tedious and error-prone. vmctl handles the plumbing: disk overlays, cloud-init ISOs, SSH key generation, network configuration, and process lifecycle. You describe <em>what</em> you want; vmctl figures out <em>how</em>.</p>
<p>Think of it like this:</p>
<div class="table-wrapper"><table><thead><tr><th>Docker world</th><th>vmctl world</th></tr></thead><tbody>
<tr><td><code>docker run</code></td><td><code>vmctl create --start</code></td></tr>
<tr><td><code>docker-compose.yml</code></td><td><code>VMFile.kdl</code></td></tr>
<tr><td><code>docker compose up</code></td><td><code>vmctl up</code></td></tr>
<tr><td><code>docker compose down</code></td><td><code>vmctl down</code></td></tr>
</tbody></table>
</div>
<h2 id="a-taste"><a class="header" href="#a-taste">A Taste</a></h2>
<p>Create a <code>VMFile.kdl</code>:</p>
<pre><code class="language-kdl">vm "dev" {
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
vcpus 2
memory 2048
cloud-init {
hostname "dev"
}
ssh {
user "ubuntu"
}
provision "shell" {
inline "sudo apt-get update &amp;&amp; sudo apt-get install -y build-essential"
}
}
</code></pre>
<p>Then:</p>
<pre><code class="language-bash">vmctl up # download image, create VM, boot, provision
vmctl ssh # connect over SSH
vmctl down # shut it down
</code></pre>
<h2 id="platform-support"><a class="header" href="#platform-support">Platform Support</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Platform</th><th>Backend</th><th>Status</th></tr></thead><tbody>
<tr><td>Linux</td><td>QEMU/KVM</td><td>Fully supported</td></tr>
<tr><td>illumos</td><td>Propolis/bhyve</td><td>Experimental</td></tr>
</tbody></table>
</div>
<h2 id="project-structure"><a class="header" href="#project-structure">Project Structure</a></h2>
<p>vmctl is split into two crates:</p>
<ul>
<li><strong>vm-manager</strong> - Library crate with the hypervisor abstraction, image management, SSH, provisioning, and VMFile parsing.</li>
<li><strong>vmctl</strong> - CLI binary built on top of vm-manager.</li>
</ul>
<p>Both live in a Cargo workspace under <code>crates/</code>.</p>
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<h1 id="core-types"><a class="header" href="#core-types">Core Types</a></h1>
<p>All types are defined in <code>crates/vm-manager/src/types.rs</code> and re-exported from the crate root.</p>
<h2 id="vmspec"><a class="header" href="#vmspec">VmSpec</a></h2>
<p>The input specification for creating a VM.</p>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub struct VmSpec {
pub name: String,
pub image_path: PathBuf,
pub vcpus: u16,
pub memory_mb: u64,
pub disk_gb: Option&lt;u32&gt;,
pub network: NetworkConfig,
pub cloud_init: Option&lt;CloudInitConfig&gt;,
pub ssh: Option&lt;SshConfig&gt;,
}
<span class="boring">}</span></code></pre></pre>
<h2 id="vmhandle"><a class="header" href="#vmhandle">VmHandle</a></h2>
<p>A runtime handle to a managed VM. Serializable to JSON for persistence.</p>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub struct VmHandle {
pub id: String,
pub name: String,
pub backend: BackendTag,
pub work_dir: PathBuf,
pub overlay_path: Option&lt;PathBuf&gt;,
pub seed_iso_path: Option&lt;PathBuf&gt;,
pub pid: Option&lt;u32&gt;,
pub qmp_socket: Option&lt;PathBuf&gt;,
pub console_socket: Option&lt;PathBuf&gt;,
pub vnc_addr: Option&lt;String&gt;,
pub vcpus: u16, // default: 1
pub memory_mb: u64, // default: 1024
pub disk_gb: Option&lt;u32&gt;,
pub network: NetworkConfig,
pub ssh_host_port: Option&lt;u16&gt;,
pub mac_addr: Option&lt;String&gt;,
}
<span class="boring">}</span></code></pre></pre>
<p>All optional fields default to <code>None</code> and numeric fields have sensible defaults for backward-compatible deserialization.</p>
<h2 id="vmstate"><a class="header" href="#vmstate">VmState</a></h2>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub enum VmState {
Preparing,
Prepared,
Running,
Stopped,
Failed,
Destroyed,
}
<span class="boring">}</span></code></pre></pre>
<p>Implements <code>Display</code> with lowercase names.</p>
<h2 id="networkconfig"><a class="header" href="#networkconfig">NetworkConfig</a></h2>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub enum NetworkConfig {
Tap { bridge: String },
User, // default
Vnic { name: String },
None,
}
<span class="boring">}</span></code></pre></pre>
<p>Serialized with <code>#[serde(tag = "type")]</code> for clean JSON representation.</p>
<h2 id="cloudinitconfig"><a class="header" href="#cloudinitconfig">CloudInitConfig</a></h2>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub struct CloudInitConfig {
pub user_data: Vec&lt;u8&gt;,
pub instance_id: Option&lt;String&gt;,
pub hostname: Option&lt;String&gt;,
}
<span class="boring">}</span></code></pre></pre>
<p><code>user_data</code> is the raw cloud-config YAML content.</p>
<h2 id="sshconfig"><a class="header" href="#sshconfig">SshConfig</a></h2>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub struct SshConfig {
pub user: String,
pub public_key: Option&lt;String&gt;,
pub private_key_path: Option&lt;PathBuf&gt;,
pub private_key_pem: Option&lt;String&gt;,
}
<span class="boring">}</span></code></pre></pre>
<p>Supports both file-based keys (<code>private_key_path</code>) and in-memory keys (<code>private_key_pem</code>).</p>
<h2 id="backendtag"><a class="header" href="#backendtag">BackendTag</a></h2>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub enum BackendTag {
Noop,
Qemu,
Propolis,
}
<span class="boring">}</span></code></pre></pre>
<p>Serialized as lowercase strings. Implements <code>Display</code>.</p>
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<h1 id="hypervisor-trait"><a class="header" href="#hypervisor-trait">Hypervisor Trait</a></h1>
<p>The <code>Hypervisor</code> trait is the core abstraction for VM lifecycle management. All backends implement it.</p>
<h2 id="definition"><a class="header" href="#definition">Definition</a></h2>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub trait Hypervisor: Send + Sync {
fn prepare(&amp;self, spec: &amp;VmSpec) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn start(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn stop(&amp;self, vm: &amp;VmHandle, timeout: Duration) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn suspend(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn resume(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;VmHandle&gt;&gt;;
fn destroy(&amp;self, vm: VmHandle) -&gt; impl Future&lt;Output = Result&lt;()&gt;&gt;;
fn state(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;VmState&gt;&gt;;
fn guest_ip(&amp;self, vm: &amp;VmHandle) -&gt; impl Future&lt;Output = Result&lt;String&gt;&gt;;
fn console_endpoint(&amp;self, vm: &amp;VmHandle) -&gt; Result&lt;ConsoleEndpoint&gt;;
}
<span class="boring">}</span></code></pre></pre>
<h2 id="methods"><a class="header" href="#methods">Methods</a></h2>
<h3 id="prepare"><a class="header" href="#prepare">prepare</a></h3>
<p>Allocates resources for a VM based on the provided <code>VmSpec</code>. Creates the work directory, QCOW2 overlay, cloud-init ISO, and networking configuration. Returns a <code>VmHandle</code> in the <code>Prepared</code> state.</p>
<h3 id="start"><a class="header" href="#start">start</a></h3>
<p>Boots the VM. Returns an updated <code>VmHandle</code> with runtime information (PID, VNC address, etc.).</p>
<h3 id="stop"><a class="header" href="#stop">stop</a></h3>
<p>Gracefully shuts down the VM. Tries ACPI power-down first, then force-kills after the timeout. Returns the handle in <code>Stopped</code> state.</p>
<h3 id="suspend--resume"><a class="header" href="#suspend--resume">suspend / resume</a></h3>
<p>Pauses and unpauses VM vCPUs without shutting down.</p>
<h3 id="destroy"><a class="header" href="#destroy">destroy</a></h3>
<p>Stops the VM (if running) and removes all associated resources. Takes ownership of the handle.</p>
<h3 id="state"><a class="header" href="#state">state</a></h3>
<p>Queries the current VM state by checking the process and QMP status.</p>
<h3 id="guest_ip"><a class="header" href="#guest_ip">guest_ip</a></h3>
<p>Discovers the guest's IP address. Method varies by network mode and backend.</p>
<h3 id="console_endpoint"><a class="header" href="#console_endpoint">console_endpoint</a></h3>
<p>Returns the console connection details. Synchronous (not async).</p>
<h2 id="consoleendpoint"><a class="header" href="#consoleendpoint">ConsoleEndpoint</a></h2>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub enum ConsoleEndpoint {
UnixSocket(PathBuf), // QEMU serial console
WebSocket(String), // Propolis console
None, // Noop backend
}
<span class="boring">}</span></code></pre></pre>
<h2 id="implementing-a-custom-backend"><a class="header" href="#implementing-a-custom-backend">Implementing a Custom Backend</a></h2>
<p>To add a new hypervisor backend:</p>
<ol>
<li>Create a struct implementing <code>Hypervisor</code>.</li>
<li>Add it to <code>RouterHypervisor</code> with appropriate <code>#[cfg]</code> gates.</li>
<li>Add a new variant to <code>BackendTag</code>.</li>
<li>Implement dispatch in <code>RouterHypervisor</code>'s <code>Hypervisor</code> impl.</li>
</ol>
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<h1 id="image-management-api"><a class="header" href="#image-management-api">Image Management API</a></h1>
<p>The image module handles downloading, caching, format detection, and overlay creation. Located in <code>crates/vm-manager/src/image.rs</code>.</p>
<h2 id="imagemanager"><a class="header" href="#imagemanager">ImageManager</a></h2>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub struct ImageManager {
client: reqwest::Client,
cache: PathBuf, // default: ~/.local/share/vmctl/images/
}
<span class="boring">}</span></code></pre></pre>
<h3 id="new"><a class="header" href="#new">new</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>ImageManager::new() -&gt; Self
<span class="boring">}</span></code></pre></pre>
<p>Creates an ImageManager with the default cache directory.</p>
<h3 id="download"><a class="header" href="#download">download</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>async fn download(&amp;self, url: &amp;str, destination: &amp;Path) -&gt; Result&lt;()&gt;
<span class="boring">}</span></code></pre></pre>
<p>Downloads an image from a URL to a local path. Skips if the destination already exists. Auto-decompresses <code>.zst</code>/<code>.zstd</code> files. Logs progress every 5%.</p>
<h3 id="pull"><a class="header" href="#pull">pull</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>async fn pull(&amp;self, url: &amp;str, name: Option&lt;&amp;str&gt;) -&gt; Result&lt;PathBuf&gt;
<span class="boring">}</span></code></pre></pre>
<p>Downloads an image to the cache directory and returns the cached path. If <code>name</code> is None, extracts the filename from the URL.</p>
<h3 id="list"><a class="header" href="#list">list</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>fn list(&amp;self) -&gt; Result&lt;Vec&lt;CachedImage&gt;&gt;
<span class="boring">}</span></code></pre></pre>
<p>Lists all images in the cache with their names, sizes, and paths.</p>
<h3 id="detect_format"><a class="header" href="#detect_format">detect_format</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>async fn detect_format(path: &amp;Path) -&gt; Result&lt;String&gt;
<span class="boring">}</span></code></pre></pre>
<p>Runs <code>qemu-img info --output=json</code> and returns the format string (e.g., <code>"qcow2"</code>, <code>"raw"</code>).</p>
<h3 id="create_overlay"><a class="header" href="#create_overlay">create_overlay</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>async fn create_overlay(base: &amp;Path, overlay: &amp;Path, size_gb: Option&lt;u32&gt;) -&gt; Result&lt;()&gt;
<span class="boring">}</span></code></pre></pre>
<p>Creates a QCOW2 overlay with the given base image as a backing file. Optionally resizes to <code>size_gb</code>.</p>
<h3 id="convert"><a class="header" href="#convert">convert</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>async fn convert(src: &amp;Path, dst: &amp;Path, format: &amp;str) -&gt; Result&lt;()&gt;
<span class="boring">}</span></code></pre></pre>
<p>Converts an image between formats using <code>qemu-img convert</code>.</p>
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<h1 id="ssh-and-provisioning-api"><a class="header" href="#ssh-and-provisioning-api">SSH and Provisioning API</a></h1>
<h2 id="ssh-module"><a class="header" href="#ssh-module">SSH Module</a></h2>
<p>Located in <code>crates/vm-manager/src/ssh.rs</code>.</p>
<h3 id="connect"><a class="header" href="#connect">connect</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn connect(ip: &amp;str, port: u16, config: &amp;SshConfig) -&gt; Result&lt;Session&gt;
<span class="boring">}</span></code></pre></pre>
<p>Establishes an SSH connection and authenticates. Supports in-memory PEM keys and file-based keys.</p>
<h3 id="exec"><a class="header" href="#exec">exec</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn exec(sess: &amp;Session, cmd: &amp;str) -&gt; Result&lt;(String, String, i32)&gt;
<span class="boring">}</span></code></pre></pre>
<p>Executes a command and returns <code>(stdout, stderr, exit_code)</code>.</p>
<h3 id="exec_streaming"><a class="header" href="#exec_streaming">exec_streaming</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn exec_streaming&lt;W1: Write, W2: Write&gt;(
sess: &amp;Session,
cmd: &amp;str,
stdout_writer: &amp;mut W1,
stderr_writer: &amp;mut W2,
) -&gt; Result&lt;(String, String, i32)&gt;
<span class="boring">}</span></code></pre></pre>
<p>Executes a command with real-time output streaming. Uses non-blocking I/O with 8KB buffers and 50ms polling interval. Both writes to the provided writers and collects the full output.</p>
<h3 id="upload"><a class="header" href="#upload">upload</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn upload(sess: &amp;Session, local: &amp;Path, remote: &amp;str) -&gt; Result&lt;()&gt;
<span class="boring">}</span></code></pre></pre>
<p>Uploads a file via SFTP.</p>
<h3 id="connect_with_retry"><a class="header" href="#connect_with_retry">connect_with_retry</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub async fn connect_with_retry(
ip: &amp;str,
port: u16,
config: &amp;SshConfig,
timeout: Duration,
) -&gt; Result&lt;Session&gt;
<span class="boring">}</span></code></pre></pre>
<p>Retries connection with exponential backoff (1s to 5s). Runs blocking SSH on <code>tokio::task::spawn_blocking</code>.</p>
<h2 id="provisioning-module"><a class="header" href="#provisioning-module">Provisioning Module</a></h2>
<p>Located in <code>crates/vm-manager/src/provision.rs</code>.</p>
<h3 id="run_provisions"><a class="header" href="#run_provisions">run_provisions</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn run_provisions(
sess: &amp;Session,
provisions: &amp;[ProvisionDef],
base_dir: &amp;Path,
vm_name: &amp;str,
log_dir: Option&lt;&amp;Path&gt;,
) -&gt; Result&lt;()&gt;
<span class="boring">}</span></code></pre></pre>
<p>Runs all provisioners in sequence:</p>
<ol>
<li><strong>Shell (inline)</strong>: Executes the command via <code>exec_streaming</code>.</li>
<li><strong>Shell (script)</strong>: Uploads the script to <code>/tmp/vmctl-provision-&lt;step&gt;.sh</code>, makes it executable, runs it.</li>
<li><strong>File</strong>: Uploads via SFTP.</li>
</ol>
<p>Output is streamed to the terminal and appended to <code>provision.log</code> if <code>log_dir</code> is provided.</p>
<p>Aborts on the first non-zero exit code with <code>VmError::ProvisionFailed</code>.</p>
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<h1 id="using-vm-manager-as-a-crate"><a class="header" href="#using-vm-manager-as-a-crate">Using vm-manager as a Crate</a></h1>
<p>The <code>vm-manager</code> library can be used as a Rust dependency for building custom VM management tools.</p>
<h2 id="add-the-dependency"><a class="header" href="#add-the-dependency">Add the Dependency</a></h2>
<pre><code class="language-toml">[dependencies]
vm-manager = { path = "crates/vm-manager" }
# or from a git repository:
# vm-manager = { git = "https://github.com/user/vm-manager.git" }
</code></pre>
<h2 id="re-exports"><a class="header" href="#re-exports">Re-Exports</a></h2>
<p>The crate root re-exports the most commonly used types:</p>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>use vm_manager::{
// Hypervisor abstraction
Hypervisor, ConsoleEndpoint, RouterHypervisor,
// Error handling
VmError, Result,
// Core types
BackendTag, VmSpec, VmHandle, VmState,
NetworkConfig, CloudInitConfig, SshConfig,
};
<span class="boring">}</span></code></pre></pre>
<h2 id="minimal-example"><a class="header" href="#minimal-example">Minimal Example</a></h2>
<pre><pre class="playground"><code class="language-rust">use vm_manager::{RouterHypervisor, Hypervisor, VmSpec, NetworkConfig};
use std::time::Duration;
#[tokio::main]
async fn main() -&gt; vm_manager::Result&lt;()&gt; {
// Create a hypervisor (platform-detected)
let hyp = RouterHypervisor::new(None, "rpool".into());
// Define a VM
let spec = VmSpec {
name: "example".into(),
image_path: "/path/to/image.qcow2".into(),
vcpus: 2,
memory_mb: 2048,
disk_gb: Some(20),
network: NetworkConfig::User,
cloud_init: None,
ssh: None,
};
// Lifecycle
let handle = hyp.prepare(&amp;spec).await?;
let handle = hyp.start(&amp;handle).await?;
// ... use the VM ...
hyp.stop(&amp;handle, Duration::from_secs(30)).await?;
hyp.destroy(handle).await?;
Ok(())
}</code></pre></pre>
<h2 id="feature-flags"><a class="header" href="#feature-flags">Feature Flags</a></h2>
<div class="table-wrapper"><table><thead><tr><th>Feature</th><th>Effect</th></tr></thead><tbody>
<tr><td><code>pure-iso</code></td><td>Use pure-Rust ISO generation instead of <code>genisoimage</code>/<code>mkisofs</code></td></tr>
</tbody></table>
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<h1 id="vmfile-parsing-api"><a class="header" href="#vmfile-parsing-api">VMFile Parsing API</a></h1>
<p>The VMFile module parses and resolves <code>VMFile.kdl</code> configuration files. Located in <code>crates/vm-manager/src/vmfile.rs</code>.</p>
<h2 id="types"><a class="header" href="#types">Types</a></h2>
<h3 id="vmfile"><a class="header" href="#vmfile">VmFile</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub struct VmFile {
pub base_dir: PathBuf,
pub vms: Vec&lt;VmDef&gt;,
}
<span class="boring">}</span></code></pre></pre>
<h3 id="vmdef"><a class="header" href="#vmdef">VmDef</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub struct VmDef {
pub name: String,
pub image: ImageSource,
pub vcpus: u16,
pub memory_mb: u64,
pub disk_gb: Option&lt;u32&gt;,
pub network: NetworkDef,
pub cloud_init: Option&lt;CloudInitDef&gt;,
pub ssh: Option&lt;SshDef&gt;,
pub provisions: Vec&lt;ProvisionDef&gt;,
}
<span class="boring">}</span></code></pre></pre>
<h3 id="imagesource"><a class="header" href="#imagesource">ImageSource</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub enum ImageSource {
Local(String),
Url(String),
}
<span class="boring">}</span></code></pre></pre>
<h3 id="provisiondef"><a class="header" href="#provisiondef">ProvisionDef</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub enum ProvisionDef {
Shell(ShellProvision),
File(FileProvision),
}
pub struct ShellProvision {
pub inline: Option&lt;String&gt;,
pub script: Option&lt;String&gt;,
}
pub struct FileProvision {
pub source: String,
pub destination: String,
}
<span class="boring">}</span></code></pre></pre>
<h2 id="functions"><a class="header" href="#functions">Functions</a></h2>
<h3 id="discover"><a class="header" href="#discover">discover</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn discover(explicit: Option&lt;&amp;Path&gt;) -&gt; Result&lt;PathBuf&gt;
<span class="boring">}</span></code></pre></pre>
<p>Finds the VMFile. If <code>explicit</code> is provided, uses that path. Otherwise, looks for <code>VMFile.kdl</code> in the current directory.</p>
<h3 id="parse"><a class="header" href="#parse">parse</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn parse(path: &amp;Path) -&gt; Result&lt;VmFile&gt;
<span class="boring">}</span></code></pre></pre>
<p>Parses a VMFile.kdl into a <code>VmFile</code> struct. Validates:</p>
<ul>
<li>At least one <code>vm</code> block.</li>
<li>No duplicate VM names.</li>
<li>Each VM has a valid image source.</li>
<li>Provisioner blocks are well-formed.</li>
</ul>
<h3 id="resolve"><a class="header" href="#resolve">resolve</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub async fn resolve(def: &amp;VmDef, base_dir: &amp;Path) -&gt; Result&lt;VmSpec&gt;
<span class="boring">}</span></code></pre></pre>
<p>Converts a <code>VmDef</code> into a <code>VmSpec</code> ready for the hypervisor:</p>
<ul>
<li>Downloads images from URLs.</li>
<li>Resolves local image paths.</li>
<li>Generates Ed25519 SSH keypairs if needed.</li>
<li>Reads cloud-init user-data files.</li>
<li>Resolves all relative paths against <code>base_dir</code>.</li>
</ul>
<h3 id="utility-functions"><a class="header" href="#utility-functions">Utility Functions</a></h3>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn expand_tilde(s: &amp;str) -&gt; PathBuf
<span class="boring">}</span></code></pre></pre>
<p>Expands <code>~</code> to the user's home directory.</p>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn resolve_path(raw: &amp;str, base_dir: &amp;Path) -&gt; PathBuf
<span class="boring">}</span></code></pre></pre>
<p>Expands tilde and makes relative paths absolute against <code>base_dir</code>.</p>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>pub fn generate_ssh_keypair(vm_name: &amp;str) -&gt; Result&lt;(String, String)&gt;
<span class="boring">}</span></code></pre></pre>
<p>Generates an Ed25519 keypair. Returns <code>(public_key_openssh, private_key_pem)</code>.</p>
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// Helper to parse a url into its building blocks.
function parseURL(url) {
const a = document.createElement('a');
a.href = url;
return {
source: url,
protocol: a.protocol.replace(':', ''),
host: a.hostname,
port: a.port,
params: (function() {
const ret = {};
const seg = a.search.replace(/^\?/, '').split('&');
for (const part of seg) {
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continue;
}
const s = part.split('=');
ret[s[0]] = s[1];
}
return ret;
})(),
file: (a.pathname.match(/\/([^/?#]+)$/i) || ['', ''])[1],
hash: a.hash.replace('#', ''),
path: a.pathname.replace(/^([^/])/, '/$1'),
};
}
// Helper to recreate a url string from its building blocks.
function renderURL(urlobject) {
let url = urlobject.protocol + '://' + urlobject.host;
if (urlobject.port !== '') {
url += ':' + urlobject.port;
}
url += urlobject.path;
let joiner = '?';
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joiner = '&';
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}
if (urlobject.hash !== '') {
url += '#' + urlobject.hash;
}
return url;
}
// Helper to escape html special chars for displaying the teasers
const escapeHTML = (function() {
const MAP = {
'&': '&amp;',
'<': '&lt;',
'>': '&gt;',
'"': '&#34;',
'\'': '&#39;',
};
const repl = function(c) {
return MAP[c];
};
return function(s) {
return s.replace(/[&<>'"]/g, repl);
};
})();
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teaser_count++;
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url.push('');
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const encoded_search = encodeURIComponent(searchterms.join(' ')).replace(/'/g, '%27');
return '<a href="' + path_to_root + url[0] + '?' + URL_MARK_PARAM + '=' + encoded_search
+ '#' + url[1] + '" aria-details="teaser_' + teaser_count + '">'
+ result.doc.breadcrumbs + '</a>' + '<span class="teaser" id="teaser_' + teaser_count
+ '" aria-label="Search Result Teaser">' + teaser + '</span>';
}
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// First, assign a value to each word in the document:
// Words that correspond to search terms (stemmer aware): 40
// Normal words: 2
// First word in a sentence: 8
// Then use a sliding window with a constant number of words and count the
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// Enclose the terms in <em>.
const stemmed_searchterms = searchterms.map(function(w) {
return elasticlunr.stemmer(w.toLowerCase());
});
const searchterm_weight = 40;
const weighted = []; // contains elements of ["word", weight, index_in_document]
// split in sentences, then words
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let index = 0;
let value = 0;
let searchterm_found = false;
for (const sentenceindex in sentences) {
const words = sentences[sentenceindex].split(' ');
value = 8;
for (const wordindex in words) {
const word = words[wordindex];
if (word.length > 0) {
for (const searchtermindex in stemmed_searchterms) {
if (elasticlunr.stemmer(word).startsWith(
stemmed_searchterms[searchtermindex])
) {
value = searchterm_weight;
searchterm_found = true;
}
}
weighted.push([word, value, index]);
value = 2;
}
index += word.length;
index += 1; // ' ' or '.' if last word in sentence
}
index += 1; // because we split at a two-char boundary '. '
}
if (weighted.length === 0) {
return body;
}
const window_weight = [];
const window_size = Math.min(weighted.length, results_options.teaser_word_count);
let cur_sum = 0;
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cur_sum += weighted[wordindex][1];
}
window_weight.push(cur_sum);
for (let wordindex = 0; wordindex < weighted.length - window_size; wordindex++) {
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cur_sum += weighted[wordindex + window_size][1];
window_weight.push(cur_sum);
}
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if (searchterm_found) {
let max_sum = 0;
// backwards
for (let i = window_weight.length - 1; i >= 0; i--) {
if (window_weight[i] > max_sum) {
max_sum = window_weight[i];
max_sum_window_index = i;
}
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} else {
max_sum_window_index = 0;
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// add <em/> around searchterms
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index = weighted[max_sum_window_index][2];
for (let i = max_sum_window_index; i < max_sum_window_index + window_size; i++) {
const word = weighted[i];
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// missing text from index to start of `word`
teaser_split.push(body.substring(index, word[2]));
index = word[2];
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return teaser_split.join('');
}
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doc_urls = config.doc_urls;
searchindex = elasticlunr.Index.load(config.index);
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searchbar.focus();
const searchterm = searchbar.value.trim();
if (searchterm !== '') {
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doSearch(searchterm);
}
}
function initSearchInteractions(config) {
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searchIconClickHandler();
}, false);
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searchbarKeyUpHandler();
}, false);
document.addEventListener('keydown', e => {
globalKeyHandler(e);
}, false);
// If the user uses the browser buttons, do the same as if a reload happened
window.onpopstate = () => {
doSearchOrMarkFromUrl();
};
// Suppress "submit" events so the page doesn't reload when the user presses Enter
document.addEventListener('submit', e => {
e.preventDefault();
}, false);
// If reloaded, do the search or mark again, depending on the current url parameters
doSearchOrMarkFromUrl();
// Exported functions
config.hasFocus = hasFocus;
}
initSearchInteractions(window.search);
function unfocusSearchbar() {
// hacky, but just focusing a div only works once
const tmp = document.createElement('input');
tmp.setAttribute('style', 'position: absolute; opacity: 0;');
searchicon.appendChild(tmp);
tmp.focus();
tmp.remove();
}
// On reload or browser history backwards/forwards events, parse the url and do search or mark
function doSearchOrMarkFromUrl() {
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const url = parseURL(window.location.href);
if (Object.prototype.hasOwnProperty.call(url.params, URL_SEARCH_PARAM)
&& url.params[URL_SEARCH_PARAM] !== '') {
showSearch(true);
searchbar.value = decodeURIComponent(
(url.params[URL_SEARCH_PARAM] + '').replace(/\+/g, '%20'));
searchbarKeyUpHandler(); // -> doSearch()
} else {
showSearch(false);
}
if (Object.prototype.hasOwnProperty.call(url.params, URL_MARK_PARAM)) {
const words = decodeURIComponent(url.params[URL_MARK_PARAM]).split(' ');
marker.mark(words, {
exclude: mark_exclude,
});
const markers = document.querySelectorAll('mark');
const hide = () => {
for (let i = 0; i < markers.length; i++) {
markers[i].classList.add('fade-out');
window.setTimeout(() => {
marker.unmark();
}, 300);
}
};
for (let i = 0; i < markers.length; i++) {
markers[i].addEventListener('click', hide);
}
}
}
// Eventhandler for keyevents on `document`
function globalKeyHandler(e) {
if (e.altKey ||
e.ctrlKey ||
e.metaKey ||
e.shiftKey ||
e.target.type === 'textarea' ||
e.target.type === 'text' ||
!hasFocus() && /^(?:input|select|textarea)$/i.test(e.target.nodeName)
) {
return;
}
if (e.key === 'Escape') {
e.preventDefault();
searchbar.classList.remove('active');
setSearchUrlParameters('',
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if (hasFocus()) {
unfocusSearchbar();
}
showSearch(false);
marker.unmark();
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e.preventDefault();
showSearch(true);
window.scrollTo(0, 0);
searchbar.select();
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|| e.key === 'Enter')) {
e.preventDefault();
const first = searchresults.firstElementChild;
if (first !== null) {
unfocusSearchbar();
first.classList.add('focus');
if (e.key === 'Enter') {
window.location.assign(first.querySelector('a'));
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}
} else if (!hasFocus() && (e.key === 'ArrowDown'
|| e.key === 'ArrowUp'
|| e.key === 'Enter')) {
// not `:focus` because browser does annoying scrolling
const focused = searchresults.querySelector('li.focus');
if (!focused) {
return;
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e.preventDefault();
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const next = focused.nextElementSibling;
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focused.classList.remove('focus');
next.classList.add('focus');
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focused.classList.remove('focus');
const prev = focused.previousElementSibling;
if (prev) {
prev.classList.add('focus');
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searchbar.select();
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} else { // Enter
window.location.assign(focused.querySelector('a'));
}
}
}
function loadSearchScript(url, id) {
if (document.getElementById(id)) {
return;
}
searchbar_outer.classList.add('searching');
const script = document.createElement('script');
script.src = url;
script.id = id;
script.onload = () => init(window.search);
script.onerror = error => {
console.error(`Failed to load \`${url}\`: ${error}`);
};
document.head.append(script);
}
function showSearch(yes) {
if (yes) {
loadSearchScript(
window.path_to_searchindex_js ||
path_to_root + 'searchindex.js',
'search-index');
search_wrap.classList.remove('hidden');
searchicon.setAttribute('aria-expanded', 'true');
} else {
search_wrap.classList.add('hidden');
searchicon.setAttribute('aria-expanded', 'false');
const results = searchresults.children;
for (let i = 0; i < results.length; i++) {
results[i].classList.remove('focus');
}
}
}
function showResults(yes) {
if (yes) {
searchresults_outer.classList.remove('hidden');
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searchresults_outer.classList.add('hidden');
}
}
// Eventhandler for search icon
function searchIconClickHandler() {
if (search_wrap.classList.contains('hidden')) {
showSearch(true);
window.scrollTo(0, 0);
searchbar.select();
} else {
showSearch(false);
}
}
// Eventhandler for keyevents while the searchbar is focused
function searchbarKeyUpHandler() {
const searchterm = searchbar.value.trim();
if (searchterm !== '') {
searchbar.classList.add('active');
doSearch(searchterm);
} else {
searchbar.classList.remove('active');
showResults(false);
removeChildren(searchresults);
}
setSearchUrlParameters(searchterm, 'push_if_new_search_else_replace');
// Remove marks
marker.unmark();
}
// Update current url with ?URL_SEARCH_PARAM= parameter, remove ?URL_MARK_PARAM and
// `#heading-anchor`. `action` can be one of "push", "replace",
// "push_if_new_search_else_replace" and replaces or pushes a new browser history item.
// "push_if_new_search_else_replace" pushes if there is no `?URL_SEARCH_PARAM=abc` yet.
function setSearchUrlParameters(searchterm, action) {
const url = parseURL(window.location.href);
const first_search = !Object.prototype.hasOwnProperty.call(url.params, URL_SEARCH_PARAM);
if (searchterm !== '' || action === 'push_if_new_search_else_replace') {
url.params[URL_SEARCH_PARAM] = searchterm;
delete url.params[URL_MARK_PARAM];
url.hash = '';
} else {
delete url.params[URL_MARK_PARAM];
delete url.params[URL_SEARCH_PARAM];
}
// A new search will also add a new history item, so the user can go back
// to the page prior to searching. A updated search term will only replace
// the url.
if (action === 'push' || action === 'push_if_new_search_else_replace' && first_search ) {
history.pushState({}, document.title, renderURL(url));
} else if (action === 'replace' ||
action === 'push_if_new_search_else_replace' &&
!first_search
) {
history.replaceState({}, document.title, renderURL(url));
}
}
function doSearch(searchterm) {
// Don't search the same twice
if (current_searchterm === searchterm) {
return;
}
searchbar_outer.classList.add('searching');
if (searchindex === null) {
return;
}
current_searchterm = searchterm;
// Do the actual search
const results = searchindex.search(searchterm, search_options);
const resultcount = Math.min(results.length, results_options.limit_results);
// Display search metrics
searchresults_header.innerText = formatSearchMetric(resultcount, searchterm);
// Clear and insert results
const searchterms = searchterm.split(' ');
removeChildren(searchresults);
for (let i = 0; i < resultcount ; i++) {
const resultElem = document.createElement('li');
resultElem.innerHTML = formatSearchResult(results[i], searchterms);
searchresults.appendChild(resultElem);
}
// Display results
showResults(true);
searchbar_outer.classList.remove('searching');
}
// Exported functions
search.hasFocus = hasFocus;
})(window.search);

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<h1 id="declarative-workflow-with-vmfilekdl"><a class="header" href="#declarative-workflow-with-vmfilekdl">Declarative Workflow with VMFile.kdl</a></h1>
<p>This tutorial shows how to define VMs in a configuration file and manage them with <code>vmctl up</code>/<code>down</code>.</p>
<h2 id="write-a-vmfile"><a class="header" href="#write-a-vmfile">Write a VMFile</a></h2>
<p>Create <code>VMFile.kdl</code> in your project directory:</p>
<pre><code class="language-kdl">vm "webserver" {
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
vcpus 2
memory 2048
disk 20
cloud-init {
hostname "webserver"
}
ssh {
user "ubuntu"
}
provision "shell" {
inline "sudo apt-get update &amp;&amp; sudo apt-get install -y nginx"
}
provision "shell" {
inline "echo 'Hello from vmctl!' | sudo tee /var/www/html/index.html"
}
}
</code></pre>
<h2 id="bring-it-up"><a class="header" href="#bring-it-up">Bring It Up</a></h2>
<pre><code class="language-bash">vmctl up
</code></pre>
<p>vmctl will:</p>
<ol>
<li>Discover <code>VMFile.kdl</code> in the current directory.</li>
<li>Download the Ubuntu image (or use the cached copy).</li>
<li>Generate an Ed25519 SSH keypair for this VM.</li>
<li>Create a QCOW2 overlay with 20GB disk.</li>
<li>Build a cloud-init ISO with the hostname and generated SSH key.</li>
<li>Boot the VM.</li>
<li>Wait for SSH to become available.</li>
<li>Run the provision steps in order, streaming output to your terminal.</li>
</ol>
<h2 id="connect"><a class="header" href="#connect">Connect</a></h2>
<pre><code class="language-bash">vmctl ssh
</code></pre>
<p>When there's only one VM in the VMFile, you don't need to specify the name.</p>
<h2 id="make-changes"><a class="header" href="#make-changes">Make Changes</a></h2>
<p>Edit <code>VMFile.kdl</code> to add another provisioner, then reload:</p>
<pre><code class="language-bash">vmctl reload
</code></pre>
<p>This destroys the existing VM and recreates it from scratch with the updated definition.</p>
<p>To re-run just the provisioners without recreating:</p>
<pre><code class="language-bash">vmctl provision
</code></pre>
<h2 id="bring-it-down"><a class="header" href="#bring-it-down">Bring It Down</a></h2>
<p>Stop the VM:</p>
<pre><code class="language-bash">vmctl down
</code></pre>
<p>Or stop and destroy:</p>
<pre><code class="language-bash">vmctl down --destroy
</code></pre>
<h2 id="filtering-by-name"><a class="header" href="#filtering-by-name">Filtering by Name</a></h2>
<p>If your VMFile defines multiple VMs, use <code>--name</code> to target a specific one:</p>
<pre><code class="language-bash">vmctl up --name webserver
vmctl ssh --name webserver
vmctl down --name webserver
</code></pre>
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<h1 id="creating-a-vm-imperatively"><a class="header" href="#creating-a-vm-imperatively">Creating a VM Imperatively</a></h1>
<p>This tutorial walks through the full lifecycle of a VM using individual vmctl commands.</p>
<h2 id="create-a-vm"><a class="header" href="#create-a-vm">Create a VM</a></h2>
<pre><code class="language-bash">vmctl create \
--name tutorial \
--image-url https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img \
--vcpus 2 \
--memory 2048 \
--ssh-key ~/.ssh/id_ed25519.pub
</code></pre>
<p>This downloads the image (cached for future use), creates a QCOW2 overlay, generates a cloud-init ISO with your SSH key, and registers the VM.</p>
<h2 id="start-it"><a class="header" href="#start-it">Start It</a></h2>
<pre><code class="language-bash">vmctl start tutorial
</code></pre>
<h2 id="check-status"><a class="header" href="#check-status">Check Status</a></h2>
<pre><code class="language-bash">vmctl list
</code></pre>
<pre><code class="language-text">NAME BACKEND VCPUS MEM NETWORK PID SSH
tutorial qemu 2 2048 user 12345 10042
</code></pre>
<p>For detailed info:</p>
<pre><code class="language-bash">vmctl status tutorial
</code></pre>
<h2 id="connect-via-ssh"><a class="header" href="#connect-via-ssh">Connect via SSH</a></h2>
<pre><code class="language-bash">vmctl ssh tutorial
</code></pre>
<p>vmctl waits for SSH to become available (cloud-init needs a moment to set up the user), then drops you into a shell.</p>
<h2 id="suspend-and-resume"><a class="header" href="#suspend-and-resume">Suspend and Resume</a></h2>
<p>Pause the VM without shutting it down:</p>
<pre><code class="language-bash">vmctl suspend tutorial
</code></pre>
<p>Resume it:</p>
<pre><code class="language-bash">vmctl resume tutorial
</code></pre>
<p>The VM continues from exactly where it was, no reboot needed.</p>
<h2 id="stop-the-vm"><a class="header" href="#stop-the-vm">Stop the VM</a></h2>
<pre><code class="language-bash">vmctl stop tutorial
</code></pre>
<p>This sends an ACPI power-down signal. If the guest doesn't shut down within 30 seconds, vmctl sends SIGTERM.</p>
<p>To change the timeout:</p>
<pre><code class="language-bash">vmctl stop tutorial --timeout 60
</code></pre>
<h2 id="restart"><a class="header" href="#restart">Restart</a></h2>
<p>A stopped VM can be started again:</p>
<pre><code class="language-bash">vmctl start tutorial
</code></pre>
<h2 id="destroy"><a class="header" href="#destroy">Destroy</a></h2>
<p>When you're done, clean up everything:</p>
<pre><code class="language-bash">vmctl destroy tutorial
</code></pre>
<p>This stops the VM (if running), removes the overlay, cloud-init ISO, and all work directory files, and unregisters the VM from the store.</p>
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<h1 id="real-world-omnios-builder-vm"><a class="header" href="#real-world-omnios-builder-vm">Real-World: OmniOS Builder VM</a></h1>
<p>This tutorial walks through the real-world VMFile.kdl used in the vm-manager project itself to build software on OmniOS (an illumos distribution).</p>
<h2 id="the-goal"><a class="header" href="#the-goal">The Goal</a></h2>
<p>Build a Rust binary (<code>forger</code>) on OmniOS. This requires:</p>
<ol>
<li>An OmniOS cloud VM with development tools.</li>
<li>Uploading the source code.</li>
<li>Compiling on the guest.</li>
</ol>
<h2 id="the-vmfile"><a class="header" href="#the-vmfile">The VMFile</a></h2>
<pre><code class="language-kdl">vm "omnios-builder" {
image-url "https://downloads.omnios.org/media/stable/omnios-r151056.cloud.qcow2"
vcpus 4
memory 4096
disk 20
cloud-init {
hostname "omnios-builder"
}
ssh {
user "smithy"
}
provision "shell" {
script "scripts/bootstrap-omnios.sh"
}
provision "file" {
source "scripts/forger-src.tar.gz"
destination "/tmp/forger-src.tar.gz"
}
provision "shell" {
script "scripts/install-forger.sh"
}
}
</code></pre>
<h2 id="stage-1-bootstrap-bootstrap-omniossh"><a class="header" href="#stage-1-bootstrap-bootstrap-omniossh">Stage 1: Bootstrap (<code>bootstrap-omnios.sh</code>)</a></h2>
<p>This script installs system packages and the Rust toolchain:</p>
<ul>
<li>Sets up PATH for GNU tools (OmniOS ships BSD-style tools by default).</li>
<li>Installs <code>gcc14</code>, <code>gnu-make</code>, <code>pkg-config</code>, <code>openssl</code>, <code>curl</code>, <code>git</code>, and other build dependencies via IPS (<code>pkg install</code>).</li>
<li>Installs Rust via <code>rustup</code>.</li>
<li>Verifies all tools are available.</li>
</ul>
<h2 id="stage-2-upload-source"><a class="header" href="#stage-2-upload-source">Stage 2: Upload Source</a></h2>
<p>The <code>file</code> provisioner uploads a pre-packed tarball of the forger source code. This tarball is created beforehand with:</p>
<pre><code class="language-bash">./scripts/pack-forger.sh
</code></pre>
<p>The pack script:</p>
<ul>
<li>Copies <code>crates/forger</code>, <code>crates/spec-parser</code>, and <code>images/</code> into a staging directory.</li>
<li>Generates a minimal workspace <code>Cargo.toml</code>.</li>
<li>Includes <code>Cargo.lock</code> for reproducible builds.</li>
<li>Creates <code>scripts/forger-src.tar.gz</code>.</li>
</ul>
<h2 id="stage-3-build-and-install-install-forgersh"><a class="header" href="#stage-3-build-and-install-install-forgersh">Stage 3: Build and Install (<code>install-forger.sh</code>)</a></h2>
<ul>
<li>Extracts the tarball to <code>$HOME/forger</code>.</li>
<li>Runs <code>cargo build -p forger --release</code>.</li>
<li>Copies the binary to <code>/usr/local/bin/forger</code>.</li>
</ul>
<h2 id="the-full-workflow"><a class="header" href="#the-full-workflow">The Full Workflow</a></h2>
<pre><code class="language-bash"># Pack the source on the host
./scripts/pack-forger.sh
# Bring up the VM, provision, and build
vmctl up
# SSH in to test the binary
vmctl ssh
forger --help
# Tear it down when done
vmctl down --destroy
</code></pre>
<h2 id="key-takeaways"><a class="header" href="#key-takeaways">Key Takeaways</a></h2>
<ul>
<li><strong>Multi-stage provisioning</strong> separates concerns: system setup, source upload, build.</li>
<li><strong>File provisioners</strong> transfer artifacts to the guest.</li>
<li><strong>Script provisioners</strong> are easier to iterate on than inline commands for complex logic.</li>
<li><strong>Streaming output</strong> lets you watch the build progress in real-time.</li>
</ul>
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<h1 id="provisioning"><a class="header" href="#provisioning">Provisioning</a></h1>
<p>Provisioners run commands and upload files to a VM after it boots. They execute in order and stop on the first failure.</p>
<h2 id="provision-types"><a class="header" href="#provision-types">Provision Types</a></h2>
<h3 id="shell-with-inline-command"><a class="header" href="#shell-with-inline-command">Shell with Inline Command</a></h3>
<p>Execute a command directly on the guest:</p>
<pre><code class="language-kdl">provision "shell" {
inline "sudo apt-get update &amp;&amp; sudo apt-get install -y curl"
}
</code></pre>
<h3 id="shell-with-script-file"><a class="header" href="#shell-with-script-file">Shell with Script File</a></h3>
<p>Upload and execute a local script:</p>
<pre><code class="language-kdl">provision "shell" {
script "scripts/setup.sh"
}
</code></pre>
<p>The script is uploaded to <code>/tmp/vmctl-provision-&lt;step&gt;.sh</code> on the guest, made executable, and run. Paths are relative to the directory containing <code>VMFile.kdl</code>.</p>
<h3 id="file-upload"><a class="header" href="#file-upload">File Upload</a></h3>
<p>Upload a file to the guest via SFTP:</p>
<pre><code class="language-kdl">provision "file" {
source "config/nginx.conf"
destination "/tmp/nginx.conf"
}
</code></pre>
<h2 id="execution-details"><a class="header" href="#execution-details">Execution Details</a></h2>
<ul>
<li>Shell provisioners stream stdout/stderr to your terminal in real-time.</li>
<li>A non-zero exit code aborts the entire provisioning sequence.</li>
<li>Output is logged to <code>provision.log</code> in the VM's work directory.</li>
<li>vmctl waits up to 120 seconds for SSH to become available before provisioning starts.</li>
</ul>
<h2 id="multi-stage-example"><a class="header" href="#multi-stage-example">Multi-Stage Example</a></h2>
<p>A common pattern is to combine file uploads with shell commands:</p>
<pre><code class="language-kdl">vm "builder" {
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
vcpus 4
memory 4096
cloud-init {
hostname "builder"
}
ssh {
user "ubuntu"
}
// Stage 1: Install dependencies
provision "shell" {
inline "sudo apt-get update &amp;&amp; sudo apt-get install -y build-essential"
}
// Stage 2: Upload source code
provision "file" {
source "src.tar.gz"
destination "/tmp/src.tar.gz"
}
// Stage 3: Build
provision "shell" {
inline "cd /tmp &amp;&amp; tar xzf src.tar.gz &amp;&amp; cd src &amp;&amp; make"
}
}
</code></pre>
<h2 id="re-running-provisioners"><a class="header" href="#re-running-provisioners">Re-Running Provisioners</a></h2>
<p>To re-run provisioners on an already-running VM:</p>
<pre><code class="language-bash">vmctl provision
</code></pre>
<p>Or for a specific VM:</p>
<pre><code class="language-bash">vmctl provision --name builder
</code></pre>
<h2 id="viewing-provision-logs"><a class="header" href="#viewing-provision-logs">Viewing Provision Logs</a></h2>
<pre><code class="language-bash">vmctl log builder --provision
</code></pre>
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<h1 id="cloud-init-block"><a class="header" href="#cloud-init-block">Cloud-Init Block</a></h1>
<p>The <code>cloud-init</code> block configures guest initialization via cloud-init's NoCloud datasource.</p>
<h2 id="syntax"><a class="header" href="#syntax">Syntax</a></h2>
<pre><code class="language-kdl">cloud-init {
hostname "myvm"
ssh-key "~/.ssh/id_ed25519.pub"
user-data "path/to/cloud-config.yaml"
}
</code></pre>
<p>All fields are optional.</p>
<h2 id="fields"><a class="header" href="#fields">Fields</a></h2>
<h3 id="hostname"><a class="header" href="#hostname">hostname</a></h3>
<pre><code class="language-kdl">hostname "myvm"
</code></pre>
<p>Sets the guest hostname via cloud-init metadata.</p>
<h3 id="ssh-key"><a class="header" href="#ssh-key">ssh-key</a></h3>
<pre><code class="language-kdl">ssh-key "~/.ssh/id_ed25519.pub"
</code></pre>
<p>Path to an SSH public key file. The key is injected into the cloud-config's <code>authorized_keys</code> for the SSH user. Path is resolved relative to the VMFile directory.</p>
<h3 id="user-data"><a class="header" href="#user-data">user-data</a></h3>
<pre><code class="language-kdl">user-data "cloud-config.yaml"
</code></pre>
<p>Path to a raw cloud-config YAML file. When this is set, vmctl passes the file contents directly as user-data without generating its own cloud-config. You are responsible for user creation and SSH setup.</p>
<p><strong>Mutually exclusive with <code>ssh-key</code></strong> in practice - if you provide raw user-data, vmctl won't inject any SSH keys.</p>
<h2 id="auto-generated-ssh-keys"><a class="header" href="#auto-generated-ssh-keys">Auto-Generated SSH Keys</a></h2>
<p>When a <code>cloud-init</code> block is present but neither <code>ssh-key</code> nor <code>user-data</code> is specified, vmctl automatically:</p>
<ol>
<li>Generates a per-VM Ed25519 keypair.</li>
<li>Injects the public key into the cloud-config.</li>
<li>Stores both keys in the VM's work directory.</li>
</ol>
<p>This is the recommended approach for most use cases.</p>
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<h1 id="full-example"><a class="header" href="#full-example">Full Example</a></h1>
<p>A complete VMFile.kdl demonstrating every available feature:</p>
<pre><code class="language-kdl">// Development VM with all options specified
vm "full-example" {
// Image source: URL (auto-cached)
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
// Resources
vcpus 4
memory 4096
disk 40
// Networking: user-mode (default, no root needed)
network "user"
// Cloud-init guest configuration
cloud-init {
hostname "full-example"
// ssh-key and user-data are omitted, so vmctl auto-generates an Ed25519 keypair
}
// SSH connection settings
ssh {
user "ubuntu"
// private-key is omitted, so vmctl uses the auto-generated key
}
// Provisioners run in order after boot
provision "shell" {
inline "sudo apt-get update &amp;&amp; sudo apt-get install -y build-essential curl git"
}
provision "file" {
source "config/bashrc"
destination "/home/ubuntu/.bashrc"
}
provision "shell" {
script "scripts/setup-dev-tools.sh"
}
}
// Second VM demonstrating TAP networking and explicit keys
vm "tap-example" {
image "~/images/debian-12-generic-amd64.qcow2"
vcpus 2
memory 2048
network "tap" {
bridge "br0"
}
cloud-init {
hostname "tap-vm"
ssh-key "~/.ssh/id_ed25519.pub"
}
ssh {
user "debian"
private-key "~/.ssh/id_ed25519"
}
}
// Minimal VM: just an image and defaults
vm "minimal" {
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
}
</code></pre>
<h2 id="what-happens"><a class="header" href="#what-happens">What Happens</a></h2>
<p>Running <code>vmctl up</code> with this VMFile:</p>
<ol>
<li><strong>full-example</strong>: Downloads the Ubuntu image, creates a 40GB overlay, auto-generates SSH keys, boots with 4 vCPUs / 4GB RAM, runs three provisioners.</li>
<li><strong>tap-example</strong>: Uses a local Debian image, sets up TAP networking on <code>br0</code>, injects your existing SSH key.</li>
<li><strong>minimal</strong>: Downloads the same Ubuntu image (cache hit), boots with defaults (1 vCPU, 1GB RAM, user networking), no cloud-init, no provisioning.</li>
</ol>
<p>Use <code>--name</code> to target specific VMs:</p>
<pre><code class="language-bash">vmctl up --name full-example
vmctl ssh --name tap-example
vmctl down --name minimal
</code></pre>
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<h1 id="image-sources"><a class="header" href="#image-sources">Image Sources</a></h1>
<p>Every VM must specify exactly one image source. The two options are mutually exclusive.</p>
<h2 id="local-image"><a class="header" href="#local-image">Local Image</a></h2>
<pre><code class="language-kdl">image "path/to/image.qcow2"
</code></pre>
<p>Points to a disk image on the host filesystem. The path is resolved relative to the VMFile directory, with tilde expansion.</p>
<p>The file must exist at parse time. Supported formats are auto-detected by <code>qemu-img</code> (qcow2, raw, etc.).</p>
<h2 id="remote-image"><a class="header" href="#remote-image">Remote Image</a></h2>
<pre><code class="language-kdl">image-url "https://example.com/image.qcow2"
</code></pre>
<p>Downloads the image and caches it in <code>~/.local/share/vmctl/images/</code>. If the image is already cached, it won't be re-downloaded.</p>
<p>URLs ending in <code>.zst</code> or <code>.zstd</code> are automatically decompressed after download.</p>
<h2 id="validation"><a class="header" href="#validation">Validation</a></h2>
<ul>
<li>Exactly one of <code>image</code> or <code>image-url</code> must be specified.</li>
<li>Specifying both is an error.</li>
<li>Specifying neither is an error.</li>
</ul>
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<h1 id="multi-vm-definitions"><a class="header" href="#multi-vm-definitions">Multi-VM Definitions</a></h1>
<p>A VMFile can define multiple VMs. Each <code>vm</code> block is independent.</p>
<h2 id="example"><a class="header" href="#example">Example</a></h2>
<pre><code class="language-kdl">vm "web" {
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
vcpus 2
memory 2048
cloud-init {
hostname "web"
}
ssh {
user "ubuntu"
}
provision "shell" {
inline "sudo apt-get update &amp;&amp; sudo apt-get install -y nginx"
}
}
vm "db" {
image-url "https://cloud-images.ubuntu.com/noble/current/noble-server-cloudimg-amd64.img"
vcpus 2
memory 4096
disk 50
cloud-init {
hostname "db"
}
ssh {
user "ubuntu"
}
provision "shell" {
inline "sudo apt-get update &amp;&amp; sudo apt-get install -y postgresql"
}
}
</code></pre>
<h2 id="behavior-with-multi-vm"><a class="header" href="#behavior-with-multi-vm">Behavior with Multi-VM</a></h2>
<ul>
<li><code>vmctl up</code> brings up all VMs in order.</li>
<li><code>vmctl down</code> stops all VMs.</li>
<li><code>vmctl ssh</code> requires <code>--name</code> when multiple VMs are defined (or it will error).</li>
<li>Use <code>--name</code> with any command to target a specific VM.</li>
</ul>
<h2 id="filtering"><a class="header" href="#filtering">Filtering</a></h2>
<pre><code class="language-bash">vmctl up --name web # only bring up "web"
vmctl provision --name db # re-provision only "db"
vmctl down --name web # stop only "web"
</code></pre>
<h2 id="constraints"><a class="header" href="#constraints">Constraints</a></h2>
<ul>
<li>VM names must be unique within the file.</li>
<li>Each VM is fully independent (no shared networking or cross-references).</li>
</ul>
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<h1 id="network-block"><a class="header" href="#network-block">Network Block</a></h1>
<p>The <code>network</code> node configures VM networking.</p>
<h2 id="syntax"><a class="header" href="#syntax">Syntax</a></h2>
<pre><code class="language-kdl">network "mode"
// or
network "mode" {
// mode-specific attributes
}
</code></pre>
<h2 id="modes"><a class="header" href="#modes">Modes</a></h2>
<h3 id="user-default"><a class="header" href="#user-default">User (Default)</a></h3>
<pre><code class="language-kdl">network "user"
</code></pre>
<p>QEMU's SLIRP user-mode networking. No root required. SSH access is via a forwarded host port.</p>
<h3 id="tap"><a class="header" href="#tap">TAP</a></h3>
<pre><code class="language-kdl">network "tap"
// or with explicit bridge:
network "tap" {
bridge "br0"
}
</code></pre>
<p>TAP device attached to a Linux bridge. The guest appears on the bridge's network with a real IP.</p>
<p><strong>Default bridge:</strong> <code>"br0"</code></p>
<h3 id="none"><a class="header" href="#none">None</a></h3>
<pre><code class="language-kdl">network "none"
</code></pre>
<p>No networking.</p>
<h2 id="default"><a class="header" href="#default">Default</a></h2>
<p>If no <code>network</code> node is specified, user-mode networking is used.</p>
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<h1 id="vmfilekdl-overview"><a class="header" href="#vmfilekdl-overview">VMFile.kdl Overview</a></h1>
<p><code>VMFile.kdl</code> is the declarative configuration format for vmctl. It uses <a href="https://kdl.dev">KDL</a> (KDL Document Language), a human-friendly configuration language.</p>
<h2 id="discovery"><a class="header" href="#discovery">Discovery</a></h2>
<p>vmctl looks for <code>VMFile.kdl</code> in the current directory by default. You can override this with <code>--file</code>:</p>
<pre><code class="language-bash">vmctl up --file path/to/MyVMFile.kdl
</code></pre>
<h2 id="basic-structure"><a class="header" href="#basic-structure">Basic Structure</a></h2>
<p>A VMFile contains one or more <code>vm</code> blocks, each defining a virtual machine:</p>
<pre><code class="language-kdl">vm "name" {
// image source (required)
// resources
// networking
// cloud-init
// ssh config
// provisioners
}
</code></pre>
<h2 id="path-resolution"><a class="header" href="#path-resolution">Path Resolution</a></h2>
<p>All paths in a VMFile are resolved relative to the directory containing the VMFile. Tilde (<code>~</code>) is expanded to the user's home directory.</p>
<pre><code class="language-kdl">// Relative to VMFile directory
image "images/ubuntu.qcow2"
// Absolute path
image "/opt/images/ubuntu.qcow2"
// Home directory expansion
cloud-init {
ssh-key "~/.ssh/id_ed25519.pub"
}
</code></pre>
<h2 id="validation"><a class="header" href="#validation">Validation</a></h2>
<p>vmctl validates the VMFile on parse and provides detailed error messages with hints:</p>
<ul>
<li>VM names must be unique.</li>
<li>Each VM must have exactly one image source (<code>image</code> or <code>image-url</code>, not both).</li>
<li>Shell provisioners must have exactly one of <code>inline</code> or <code>script</code>.</li>
<li>File provisioners must have both <code>source</code> and <code>destination</code>.</li>
<li>Network type must be <code>"user"</code>, <code>"tap"</code>, or <code>"none"</code>.</li>
</ul>
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<h1 id="provision-blocks"><a class="header" href="#provision-blocks">Provision Blocks</a></h1>
<p>Provision blocks define steps to run on the guest after boot. They execute in order and abort on the first failure.</p>
<h2 id="shell-provisioner"><a class="header" href="#shell-provisioner">Shell Provisioner</a></h2>
<h3 id="inline-command"><a class="header" href="#inline-command">Inline Command</a></h3>
<pre><code class="language-kdl">provision "shell" {
inline "sudo apt-get update &amp;&amp; sudo apt-get install -y nginx"
}
</code></pre>
<p>Executes the command directly on the guest via SSH.</p>
<h3 id="script-file"><a class="header" href="#script-file">Script File</a></h3>
<pre><code class="language-kdl">provision "shell" {
script "scripts/setup.sh"
}
</code></pre>
<p>The script file is uploaded to <code>/tmp/vmctl-provision-&lt;step&gt;.sh</code> on the guest, made executable with <code>chmod +x</code>, and executed. The path is resolved relative to the VMFile directory.</p>
<h3 id="validation"><a class="header" href="#validation">Validation</a></h3>
<p>A shell provisioner must have exactly one of <code>inline</code> or <code>script</code>. Specifying both or neither is an error.</p>
<h2 id="file-provisioner"><a class="header" href="#file-provisioner">File Provisioner</a></h2>
<pre><code class="language-kdl">provision "file" {
source "config/app.conf"
destination "/etc/app/app.conf"
}
</code></pre>
<p>Uploads a local file to the guest via SFTP.</p>
<h3 id="required-fields"><a class="header" href="#required-fields">Required Fields</a></h3>
<div class="table-wrapper"><table><thead><tr><th>Field</th><th>Description</th></tr></thead><tbody>
<tr><td><code>source</code></td><td>Local file path (relative to VMFile directory)</td></tr>
<tr><td><code>destination</code></td><td>Absolute path on the guest</td></tr>
</tbody></table>
</div>
<h2 id="execution-behavior"><a class="header" href="#execution-behavior">Execution Behavior</a></h2>
<ul>
<li>Provisioners run sequentially in the order they appear.</li>
<li>Shell provisioners stream stdout and stderr to your terminal in real-time.</li>
<li>A non-zero exit code from any shell provisioner aborts the sequence.</li>
<li>All output is also logged to <code>provision.log</code> in the VM's work directory.</li>
<li>vmctl waits up to 120 seconds for SSH to become available before starting provisioners.</li>
</ul>
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<h1 id="resources"><a class="header" href="#resources">Resources</a></h1>
<p>Resource nodes control the VM's CPU, memory, and disk allocation.</p>
<h2 id="vcpus"><a class="header" href="#vcpus">vcpus</a></h2>
<pre><code class="language-kdl">vcpus 2
</code></pre>
<p>Number of virtual CPUs. Must be greater than 0.</p>
<p><strong>Default:</strong> <code>1</code></p>
<h2 id="memory"><a class="header" href="#memory">memory</a></h2>
<pre><code class="language-kdl">memory 2048
</code></pre>
<p>Memory in megabytes. Must be greater than 0.</p>
<p><strong>Default:</strong> <code>1024</code> (1 GB)</p>
<h2 id="disk"><a class="header" href="#disk">disk</a></h2>
<pre><code class="language-kdl">disk 20
</code></pre>
<p>Disk size in gigabytes. When specified, the QCOW2 overlay is created with this size, allowing the guest to use more space than the base image provides. Most cloud images auto-grow the filesystem via cloud-init.</p>
<p><strong>Default:</strong> not set (overlay matches base image size)</p>
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