GitOps Workflow

Complete Infrastructure as Code implementation using modern GitOps principles with Terraform, Ansible, and GitHub Actions.

🔄 GitOps Overview

This homelab demonstrates enterprise-grade GitOps practices by managing all infrastructure through version-controlled code with automated deployment pipelines.

Core Principles

• Declarative Infrastructure: Everything defined as code
• Version Control: All changes tracked in Git
• Automated Deployment: CI/CD pipelines for infrastructure changes
• Immutable Infrastructure: Rebuild from code rather than manual changes
• Continuous Monitoring: Validation and drift detection

🏗️ Architecture Flow

📁 Repository Structure

Main GitOps Repository

homelab-gitops/
├── terraform/                 # Infrastructure as Code
│   ├── providers.tf           # Proxmox provider configuration
│   ├── variables.tf           # Global variables
│   ├── containers/            # Container definitions by category
│   │   ├── media-stack.tf     # Media services (9 containers)
│   │   ├── monitoring.tf      # Monitoring stack (9 containers)
│   │   ├── security.tf        # Security services (4 containers)
│   │   └── business.tf        # Business apps (6 containers)
│   └── modules/               # Reusable Terraform modules
│       ├── lxc-container/     # Standard container module
│       └── firewall-rules/    # Firewall configuration
├── ansible/                   # Configuration management
│   ├── inventory/             # Host inventories
│   ├── playbooks/             # Deployment playbooks
│   ├── roles/                 # Reusable roles
│   └── group_vars/            # Group-specific variables
├── configs/                   # Application configurations
│   ├── docker-compose/        # Docker Compose files
│   ├── firewall/              # Firewall rules
│   └── monitoring/            # Monitoring configurations
└── .github/workflows/         # CI/CD automation
    ├── terraform-plan.yml     # Infrastructure planning
    ├── terraform-apply.yml    # Infrastructure deployment
    └── ansible-deploy.yml     # Configuration deployment

🚀 Deployment Workflow

1. Development Phase

# Create feature branch
git checkout -b feature/new-container

# Make infrastructure changes
vim terraform/containers/media-stack.tf

# Test locally
terraform plan

# Commit and push
git commit -m "Add new media container"
git push origin feature/new-container

2. Review Phase

# Automated testing in PR
- Terraform syntax validation
- Plan generation and review
- Security scanning
- Documentation updates

# Manual review process
- Code review by team
- Infrastructure impact assessment
- Security consideration review

3. Deployment Phase

# Merge triggers automated deployment
git merge feature/new-container

# Automated pipeline executes:
1. Terraform apply (infrastructure)
2. Ansible configuration (services)
3. Validation testing
4. Monitoring integration
5. Success/failure notifications

🛠️ Technology Stack

Infrastructure as Code

• Terraform >= 1.6.0: Primary IaC tool
• Telmate Proxmox Provider: Proxmox VE integration
• Remote State: Terraform state management with locking
• Module Architecture: Reusable infrastructure components

Configuration Management

• Ansible >= 2.15.0: Service configuration and deployment
• Dynamic Inventory: Generated from Terraform outputs
• Role-based Architecture: Modular playbook organization
• Vault Integration: Secure credential management

CI/CD Pipeline

• GitHub Actions: Automated workflow execution
• Multi-stage Deployment: Plan → Apply → Configure → Validate
• Rollback Capability: Automated recovery procedures
• Notification Integration: Real-time status updates

🔧 Key Features

Infrastructure Provisioning

• 28 LXC Containers: Complete container lifecycle management
• Network Configuration: Dual-bridge setup with VPN routing
• Storage Management: ZFS integration with mount points
• Resource Optimization: Efficient allocation across services

Service Configuration

• Docker Compose: Containerized application management
• Configuration Templates: Jinja2 templating for dynamic configs
• Secret Management: Encrypted credential handling
• Service Dependencies: Ordered deployment with health checks

Monitoring Integration

• Infrastructure Metrics: Proxmox and container monitoring
• Service Health Checks: Application-level monitoring
• Log Aggregation: Centralized logging with Loki
• Alerting: Real-time notifications via ntfy

📊 Benefits Achieved

Operational Excellence

• 99.9% Uptime: Reliable infrastructure through automation
• Zero-touch Deployments: Fully automated infrastructure changes
• Disaster Recovery: Complete rebuild capability from Git
• Change Tracking: Full audit trail of all modifications

Development Efficiency

• Rapid Deployment: New services deployed in minutes
• Consistent Environments: Identical configuration across instances
• Easy Rollbacks: Quick recovery from failed deployments
• Testing Integration: Validation before production deployment

Security & Compliance

• Version Control: All changes tracked and reviewable
• Access Control: Branch protection and review requirements
• Secret Management: Encrypted credential handling
• Network Segmentation: Automated firewall rule management

🚦 Workflow Commands

Daily Operations

# Check infrastructure status
terraform plan

# Deploy specific service category
ansible-playbook -i inventory playbooks/monitoring.yml

# Validate all services
ansible all -m ping

# View deployment logs
journalctl -f -u docker

Infrastructure Management

# Initialize new environment
terraform init
terraform workspace new production

# Apply infrastructure changes
terraform apply -auto-approve

# Destroy and rebuild (disaster recovery)
terraform destroy
terraform apply

Configuration Updates

# Deploy configuration changes
ansible-playbook -i inventory playbooks/site.yml

# Update specific container
ansible-playbook -i inventory playbooks/update-container.yml -e container=plex

# Rolling updates
ansible-playbook -i inventory playbooks/rolling-update.yml

🎯 Best Practices

Code Organization

• Modular Design: Reusable Terraform modules
• Clear Naming: Descriptive resource and variable names
• Documentation: Inline comments and external docs
• Validation: Input validation and type constraints

Change Management

• Feature Branches: All changes through pull requests
• Peer Review: Required reviews before deployment
• Testing: Automated validation in CI pipeline
• Gradual Rollout: Staged deployment approach

Security

• Least Privilege: Minimal required permissions
• Secret Rotation: Regular credential updates
• Network Isolation: Container-level firewall rules
• Audit Logging: Complete change history

This GitOps implementation transforms traditional homelab management into an enterprise-grade infrastructure practice, providing reliability, security, and scalability while maintaining the flexibility for experimentation and learning.