Reddwarf: Rust-Based Single-Binary Kubernetes Control Plane

A pure Rust implementation of a Kubernetes control plane with DAG-based resource versioning.

Project Status

Current Phase: Phase 4 Complete (API Server) ✅

Completed Phases

Phase 1: Foundation & Core Types ✅

• ✅ Workspace structure created
• ✅ Core Kubernetes types and traits (Pod, Node, Service, Namespace)
• ✅ Error handling with miette diagnostics
• ✅ ResourceKey and GroupVersionKind types
• ✅ JSON/YAML serialization helpers
• ✅ 9 tests passing

Phase 2: Storage Layer with redb ✅

• ✅ KVStore trait abstraction
• ✅ redb backend implementation (100% pure Rust)
• ✅ Key encoding for resources
• ✅ Transaction support
• ✅ Prefix scanning and indexing
• ✅ 9 tests passing

Phase 3: Versioning Layer ✅

• ✅ VersionStore for DAG-based versioning
• ✅ Commit operations (create, get, list)
• ✅ Conflict detection between concurrent modifications
• ✅ DAG traversal for history
• ✅ Common ancestor finding
• ✅ 7 tests passing

Phase 4: API Server ✅

• ✅ Axum-based REST API server
• ✅ HTTP verb handlers (GET, POST, PUT, PATCH, DELETE)
• ✅ Pod, Node, Service, Namespace endpoints
• ✅ LIST operations with prefix filtering
• ✅ Resource validation
• ✅ Kubernetes-compatible error responses
• ✅ Health check endpoints (/healthz, /livez, /readyz)
• ✅ 7 tests passing

Total: 32 tests passing ✅

Architecture

reddwarf/
├── crates/
│   ├── reddwarf-core/          # ✅ Core K8s types & traits
│   ├── reddwarf-storage/       # ✅ redb storage backend
│   ├── reddwarf-versioning/    # ✅ DAG-based versioning
│   ├── reddwarf-apiserver/     # ✅ Axum REST API server
│   ├── reddwarf-scheduler/     # 🔄 Pod scheduler (pending)
│   └── reddwarf/               # 🔄 Main binary (pending)
└── tests/                      # 🔄 Integration tests (pending)

Building

# Build all crates
cargo build --workspace

# Run all tests
cargo test --workspace

# Run clippy
cargo clippy --workspace -- -D warnings

# Build release binary
cargo build --release

Next Phases

Phase 5: Basic Scheduler (Week 6)

• Pod scheduling to nodes
• Resource-based filtering
• Simple scoring algorithm

Phase 6: Main Binary Integration (Week 7)

• Single binary combining all components
• Configuration and CLI
• TLS support
• Graceful shutdown
• Observability (logging, metrics)

Phase 7: Testing & Documentation (Week 8)

• Integration tests
• End-to-end tests with kubectl
• User documentation
• API documentation

Key Features

• Pure Rust: 100% Rust implementation, no C++ dependencies
• Portable: Supports x86_64, ARM64, illumos
• redb Storage: Fast, ACID-compliant storage with MVCC
• DAG Versioning: Advanced resource versioning with conflict detection
• Type-Safe: Leverages Rust's type system for correctness
• Rich Errors: miette diagnostics for user-friendly error messages

License

MIT OR Apache-2.0