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Zhongwei Li
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CHANGELOG.md
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CHANGELOG.md
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# Changelog
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All notable changes to Tailscale SSH Sync Agent will be documented here.
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Format based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
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Versioning follows [Semantic Versioning](https://semver.org/).
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## [1.0.0] - 2025-10-19
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### Added
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**Core Functionality:**
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- `sshsync_wrapper.py`: Python interface to sshsync CLI operations
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- `get_host_status()`: Check online/offline status of hosts
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- `execute_on_all()`: Run commands on all configured hosts
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- `execute_on_group()`: Run commands on specific groups
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- `execute_on_host()`: Run commands on single host
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- `push_to_hosts()`: Push files to multiple hosts (with groups support)
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- `pull_from_host()`: Pull files from hosts
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- `list_hosts()`: List all configured hosts
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- `get_groups()`: Get group configuration
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- `tailscale_manager.py`: Tailscale-specific operations
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- `get_tailscale_status()`: Get complete network status
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- `check_connectivity()`: Ping hosts via Tailscale
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- `get_peer_info()`: Get detailed peer information
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- `list_online_machines()`: List all online Tailscale machines
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- `validate_tailscale_ssh()`: Check if Tailscale SSH works for a host
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- `get_network_summary()`: Human-readable network summary
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- `load_balancer.py`: Intelligent task distribution
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- `get_machine_load()`: Get CPU, memory, disk metrics for a machine
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- `select_optimal_host()`: Pick best host based on current load
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- `get_group_capacity()`: Get aggregate capacity of a group
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- `distribute_tasks()`: Distribute multiple tasks optimally across hosts
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- `format_load_report()`: Format load metrics as human-readable report
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- `workflow_executor.py`: Common multi-machine workflows
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- `deploy_workflow()`: Full deployment pipeline (staging → test → production)
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- `backup_workflow()`: Backup files from multiple hosts
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- `sync_workflow()`: Sync files from one host to many
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- `rolling_restart()`: Zero-downtime service restart across group
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- `health_check_workflow()`: Check health endpoints across group
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**Utilities:**
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- `utils/helpers.py`: Common formatting and parsing functions
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- Byte formatting (`format_bytes`)
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- Duration formatting (`format_duration`)
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- Percentage formatting (`format_percentage`)
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- SSH config parsing (`parse_ssh_config`)
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- sshsync config parsing (`parse_sshsync_config`)
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- System metrics parsing (`parse_disk_usage`, `parse_memory_usage`, `parse_cpu_load`)
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- Load score calculation (`calculate_load_score`)
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- Status classification (`classify_load_status`, `classify_latency`)
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- Safe command execution (`run_command`, `safe_execute`)
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- `utils/validators/`: Comprehensive validation system
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- `parameter_validator.py`: Input validation (hosts, groups, paths, timeouts, commands)
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- `host_validator.py`: Host configuration and availability validation
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- `connection_validator.py`: SSH and Tailscale connection validation
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**Testing:**
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- `tests/test_integration.py`: 11 end-to-end integration tests
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- `tests/test_helpers.py`: 11 helper function tests
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- `tests/test_validation.py`: 7 validation tests
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- **Total: 29 tests** covering all major functionality
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**Documentation:**
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- `SKILL.md`: Complete skill documentation (6,000+ words)
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- When to use this skill
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- How it works
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- Data sources (sshsync CLI, Tailscale)
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- Detailed workflows for each operation type
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- Available scripts and functions
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- Error handling and validations
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- Performance and caching strategies
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- Usage examples
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- `references/sshsync-guide.md`: Complete sshsync CLI reference
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- `references/tailscale-integration.md`: Tailscale integration guide
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- `README.md`: Installation and quick start guide
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- `INSTALLATION.md`: Detailed setup tutorial
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- `DECISIONS.md`: Architecture decisions and rationale
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### Data Sources
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**sshsync CLI:**
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- Installation: `pip install sshsync`
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- Configuration: `~/.config/sshsync/config.yaml`
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- SSH config integration: `~/.ssh/config`
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- Group-based host management
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- Remote command execution with timeouts
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- File push/pull operations (single or recursive)
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- Status checking and connectivity validation
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**Tailscale:**
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- Zero-config VPN with WireGuard encryption
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- MagicDNS for easy host addressing
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- Built-in SSH capabilities
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- Seamless integration with standard SSH
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- Peer-to-peer connections
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- Works across NATs and firewalls
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### Coverage
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**Operations:**
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- Host status monitoring and availability checks
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- Intelligent load-based task distribution
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- Multi-host command execution (all hosts, groups, individual)
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- File synchronization workflows (push/pull)
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- Deployment pipelines (staging → production)
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- Backup and sync workflows
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- Rolling restarts with zero downtime
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- Health checking across services
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**Geographic Coverage:** All hosts in Tailscale network (global)
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**Temporal Coverage:** Real-time status and operations
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### Known Limitations
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**v1.0.0:**
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- sshsync must be installed separately (`pip install sshsync`)
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- Tailscale must be configured separately
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- SSH keys must be set up manually on each host
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- Load balancing uses simple metrics (CPU, memory, disk)
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- No built-in monitoring dashboards (terminal output only)
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- No persistence of operation history (logs only)
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- Requires SSH config and sshsync config to be manually maintained
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### Planned for v2.0
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**Enhanced Features:**
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- Automated SSH key distribution across hosts
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- Built-in operation history and logging database
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- Web dashboard for monitoring and operations
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- Advanced load balancing with custom metrics
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- Scheduled operations and cron integration
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- Operation rollback capabilities
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- Integration with configuration management tools (Ansible, Terraform)
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- Cost tracking for cloud resources
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- Performance metrics collection and visualization
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- Alert system for failed operations
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- Multi-tenancy support for team environments
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**Integrations:**
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- Prometheus metrics export
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- Grafana dashboard templates
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- Slack/Discord notifications
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- CI/CD pipeline integration
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- Container orchestration support (Docker, Kubernetes)
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## [Unreleased]
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### Planned
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- Add support for Windows hosts (PowerShell remoting)
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- Improve performance for large host groups (100+)
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- Add SSH connection pooling for faster operations
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- Implement operation queueing for long-running tasks
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- Add support for custom validation plugins
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- Expand coverage to Docker containers via SSH
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- Add retry strategies with exponential backoff
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- Implement circuit breaker pattern for failing hosts
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