Homelab Autoscaler Implementation Status
Last Updated: 2025-01-01
This document provides the authoritative, single source of truth for what's actually implemented vs planned in the homelab-autoscaler project.
🎯 Current State Summary
Overall Status: Core infrastructure operational with complete autoscaling functionality
✅ Fully Implemented & Operational
1. Core Infrastructure
- Custom Resource Definitions (CRDs): Complete Group and Node CRD implementations
- Group Controller: Fully operational - manages autoscaling policies and group health
- Core Controller: Stable - maintains consistency between Kubernetes nodes and Node CRDs
- Node Controller: Complete - FSM-based state management with power operations
- Webhook System: Validation and mutation webhooks for CRDs
- Helm Chart: Complete deployment with automated CRD synchronization
2. gRPC Server (CloudProvider Interface)
- Complete Implementation: All required CloudProvider methods implemented
- Full Integration: Works with standard Kubernetes Cluster Autoscaler
3. Finite State Machine (FSM)
- FSM Architecture: Complete implementation using looplab/fsm
- State Transitions: Full support for startup/shutdown operations
- Coordination Locking: Prevents race conditions with Cluster Autoscaler
- Job Management: Automatic Kubernetes Job creation for power operations
4. Development Tooling
- Makefile: Comprehensive build, test, and deployment automation
- Pre-commit Hooks: Full validation pipeline with code generation
- Testing Framework: Unit tests and integration test infrastructure
🚧 Partially Implemented / In Development
1. Advanced Features
- Multi-namespace support: Currently hardcoded to
homelab-autoscaler-system - TLS for gRPC: Plaintext communication only
- Advanced draining policies: Standard pod eviction only
2. Operational Features
- Production monitoring: Basic metrics, comprehensive observability needed
- Auto-recovery: Basic detection, advanced recovery mechanisms in development
📊 Detailed Component Status
Controllers
| Component | Status | Notes |
|---|---|---|
| Group Controller | ✅ Operational | Manages autoscaling policies and group health |
| Node Controller | ✅ Complete | FSM-based state management with power operations |
| Core Controller | ✅ Stable | Maintains K8s node ↔ Node CRD consistency |
gRPC CloudProvider Methods
| Method | Status | Implementation Quality |
|---|---|---|
NodeGroups() | ✅ Complete | Full integration with Kubernetes API |
NodeGroupForNode() | ✅ Complete | Proper node-group mapping |
NodeGroupTargetSize() | ✅ Complete | Accurate target size calculation |
NodeGroupNodes() | ✅ Complete | Complete node listing with status |
NodeGroupIncreaseSize() | ✅ Complete | Finds powered-off nodes and triggers startup |
NodeGroupDeleteNodes() | ✅ Complete | Sets nodes to power off state |
NodeGroupDecreaseTargetSize() | ✅ Complete | Calculates and executes target size reduction |
NodeGroupTemplateNodeInfo() | ❌ Not Started | Mock data only |
NodeGroupGetOptions() | ❌ Not Started | Returns default options only |
Power Operations
| Operation | Status | Notes |
|---|---|---|
| Startup Jobs | ✅ Complete | FSM creates and manages startup Kubernetes Jobs |
| Shutdown Jobs | ✅ Complete | FSM creates and manages shutdown Kubernetes Jobs |
| Coordination Locking | ✅ Complete | Prevents race conditions with Cluster Autoscaler |
| Error Recovery | 🚧 Partial | Basic error detection, automatic recovery in development |
FSM Implementation
| Feature | Status | Notes |
|---|---|---|
| State Management | ✅ Complete | Full FSM with states: Shutdown, StartingUp, Ready, ShuttingDown |
| Event Handling | ✅ Complete | Events: StartNode, ShutdownNode, JobCompleted, JobFailed |
| Hook Integration | ✅ Complete | Before/after hooks for coordination lock management |
| Job Monitoring | ✅ Complete | Async job monitoring with timeout handling |
| Backoff Strategy | ✅ Complete | State-aware backoff with progressive timeouts |
🔧 Known Limitations
Configuration Constraints
- Namespace: Hardcoded to
homelab-autoscaler-system - gRPC Security: No TLS support implemented
- Customization: Limited configuration options for timeouts and thresholds
Operational Limitations
- Error Handling: Complete error detection, advanced automatic recovery in development
- Monitoring: Basic metrics available, comprehensive production observability needed
- Testing: Good test coverage, additional integration tests needed
🚀 Next Development Priorities
- Production Features - Add TLS, advanced metrics, and multi-namespace support
- Error Recovery - Enhance automatic recovery mechanisms
- Observability - Comprehensive monitoring and logging for production use
- Testing Coverage - Additional integration and E2E tests
- Documentation - Complete user guides and operational procedures
📝 Verification Methodology
This status is verified by:
- Code analysis of actual implementation
- Testing existing functionality
- Comparing against CloudProvider interface requirements
- Reviewing commit history and development progress
This document is maintained as the single source of truth for implementation status. Update when features are completed or status changes.