terraform-docker-renovate/README.md

# Terraform Docker Renovate Module

## Purpose

This Terraform module deploys a Renovate bot as a Docker container with the following features:

- **Renovate Container**: Automatically updates dependencies in your repositories
- **Gitea Integration**: Native support for Gitea platform with proper authentication
- **Traefik Integration**: Automatically configures Traefik reverse proxy (optional)
- **DNS Management**: Creates DNS CNAME records for the Renovate instance (optional)
- **Persistent Storage**: Manages Docker volumes for configuration and cache
- **Vault Integration**: Securely retrieves DNS credentials from HashiCorp Vault
- **Remote State Backend**: Stores Terraform state in MinIO (S3-compatible storage)
- **Resource Limits**: Configurable memory limits for container isolation

## What It Does

The module creates and manages the following resources:

1. **Docker Volumes**:
   - `renovate-config`: Persistent storage for configuration files
   - `renovate-cache`: Cache storage for improved performance

2. **Renovate Container**:
   - Runs Renovate bot process
   - Connects to Traefik network for reverse proxy access (optional)
   - Configured with resource limits (Memory)
   - Configured with flexible restart policy
   - Logs sent to Docker daemon (managed by Loki)

3. **DNS Record** (Optional):
   - Creates a CNAME record pointing to the hosting server

## What is Renovate?

Renovate is an automated dependency update tool that:

- **Monitors dependencies** across multiple package managers and platforms
- **Creates pull requests** with dependency updates automatically
- **Supports semantic versioning** and custom update schedules
- **Works with Docker**, Terraform, npm, pip, and many other ecosystems
- **Integrates with CI/CD** pipelines for automated testing

### Common Use Cases

- Automated Docker image updates with semantic versioning
- Terraform module and provider version updates
- Application dependency management (npm, pip, composer, etc.)
- Security vulnerability patching through automatic updates
- Consistent dependency versions across multiple repositories

## Prerequisites

Before using this module, ensure you have:

1. **Docker Host**: A Docker daemon accessible via TCP (configured at `192.168.2.170:2376`)
2. **Docker TLS Certificates**: Client certificates in `~/.docker/` directory
3. **Traefik Network**: A Docker network named `traefik_network` must exist
4. **Gitea Instance**: Running Gitea instance with API access
5. **Renovate Bot User**: Dedicated user account in Gitea with appropriate permissions
6. **Gitea Access Token**: Personal Access Token with the following scopes:
   - `repo`: Read and Write
   - `user`: Read
   - `issue`: Read and Write (Gitea ≥ 1.20.0)
   - `organization`: Read (Gitea ≥ 1.20.0)
7. **HashiCorp Vault**: Running instance with:
   - AppRole authentication enabled
   - DNS credentials stored at `secret/dns`
   - Role ID and Secret ID for authentication
8. **MinIO/S3 Backend**: For Terraform state storage
9. **DNS Server**: Supporting dynamic updates (TSIG authentication) - optional

## Gitea Bot Setup

### 1. Create Renovate Bot User

In your Gitea instance:

1. Create a new user account (e.g., `renovate-bot`)
2. Configure the user with:
   - Full name: "Renovate Bot"
   - Email: `renovate-bot@example.com`
3. Add the bot user as a collaborator to repositories you want to manage

### 2. Generate Personal Access Token

1. Log in as the Renovate bot user
2. Go to Settings → Applications → Generate New Token
3. Token name: "Renovate Token"
4. Select scopes:
   - `repo` (Read and Write)
   - `user` (Read)
   - `issue` (Read and Write)
   - `organization` (Read)
5. Save the token securely - you'll need it for the `renovate_token` variable

### 3. Configure Repository Access

For each repository you want Renovate to manage:

1. Add `renovate-bot` as a collaborator with Write access
2. Or use autodiscovery to automatically find all accessible repositories

## How to Use

### 1. Basic Usage with Gitea

```hcl
module "renovate" {
  source = "./terraform-docker-renovate"

  # Infrastructure
  domain    = "bsdserver.nl"
  role_id   = var.vault_role_id
  secret_id = var.vault_secret_id

  # Gitea Configuration
  renovate_platform  = "gitea"
  renovate_endpoint  = "https://gitea.example.com/api/v1/"
  renovate_token     = var.renovate_token  # Store securely in Vault or use env var
  renovate_git_author = "Renovate Bot <renovate-bot@example.com>"
  renovate_username  = "renovate-bot"
}
```

### 2. Custom Configuration

```hcl
module "renovate" {
  source = "./terraform-docker-renovate"

  # Infrastructure
  domain    = "bsdserver.nl"
  role_id   = var.vault_role_id
  secret_id = var.vault_secret_id

  # Container configuration
  container_name   = "renovate"
  renovate_image   = "renovate/renovate:latest"
  restart_policy   = "unless-stopped"

  # Resource limits
  memory_limit      = 2048
  memory_swap_limit = -1

  # Gitea platform configuration
  renovate_platform     = "gitea"
  renovate_endpoint     = "https://gitea.bsdserver.nl/api/v1/"
  renovate_token        = var.renovate_token
  renovate_git_author   = "Renovate Bot <renovate-bot@bsdserver.nl>"
  renovate_username     = "renovate-bot"
  renovate_autodiscover = true

  # Optional GitHub.com token for changelogs
  github_com_token = var.github_token

  # Logging
  log_level = "info"

  # Additional environment variables
  extra_env_vars = [
    "RENOVATE_REQUIRE_CONFIG=optional"
  ]
}
```

### 3. Initialize Terraform

```bash
terraform init
```

This will:
- Download required providers (Docker, Vault, DNS)
- Configure the MinIO backend for state storage

### 4. Plan Deployment

```bash
terraform plan
```

Review the planned changes to ensure everything is correct.

### 5. Apply Configuration

```bash
terraform apply
```

Confirm the changes to deploy the Renovate bot.

### 6. Verify Deployment

After deployment:

1. **Check Container Status**:
   ```bash
   docker ps | grep renovate
   ```

2. **View Container Logs**:
   ```bash
   docker logs renovate -f
   ```

3. **Verify Configuration**:
   ```bash
   docker exec renovate cat /usr/src/app/config.js
   ```

## Repository Configuration

### Adding Renovate to a Repository

To enable Renovate in a repository, create a `renovate.json` file in the repository root:

```json
{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "extends": [
    "config:recommended"
  ],
  "assignees": ["@yourusername"],
  "labels": ["renovate"],
  "dependencyDashboard": true,
  "packageRules": [
    {
      "description": "Automerge minor and patch updates",
      "matchUpdateTypes": ["minor", "patch"],
      "automerge": true
    }
  ],
  "docker": {
    "enabled": true,
    "pinDigests": false
  },
  "terraform": {
    "enabled": true
  }
}
```

An example configuration is provided in `files/example-renovate.json`.

### Docker-Compose Repository Example

For repositories with `docker-compose.yml` files:

```json
{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "extends": ["config:recommended"],
  "docker-compose": {
    "enabled": true
  },
  "packageRules": [
    {
      "matchDatasources": ["docker"],
      "matchUpdateTypes": ["major"],
      "enabled": false
    }
  ]
}
```

### Terraform Repository Example

For repositories with Terraform code:

```json
{
  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
  "extends": ["config:recommended"],
  "terraform": {
    "enabled": true
  },
  "packageRules": [
    {
      "matchDatasources": ["terraform-provider", "terraform-module"],
      "automerge": false,
      "schedule": ["before 6am on Monday"]
    }
  ]
}
```

## Variables

| Variable | Description | Type | Default | Required |
|----------|-------------|------|---------|----------|
| `container_name` | Name of the Renovate container | `string` | `"renovate"` | No |
| `renovate_image` | Docker image for Renovate | `string` | `"renovate/renovate:latest"` | No |
| `restart_policy` | Restart policy for the container | `string` | `"unless-stopped"` | No |
| `memory_limit` | Memory limit for the container in MB | `number` | `2048` | No |
| `memory_swap_limit` | Memory swap limit in MB (-1 for unlimited) | `number` | `-1` | No |
| `domain` | Domain name for the application | `string` | `"bsdserver.lan"` | No |
| `dns_name` | DNS name for the Renovate service | `string` | `null` (uses container_name) | No |
| `create_cname_record` | Whether to create a DNS CNAME record | `bool` | `false` | No |
| `renovate_platform` | Git platform to use (gitea, github, gitlab) | `string` | `"gitea"` | No |
| `renovate_endpoint` | API endpoint for the git platform | `string` | - | Yes |
| `renovate_token` | Personal access token for authentication | `string` | - | Yes |
| `renovate_git_author` | Git author for Renovate commits | `string` | `"Renovate Bot <renovate-bot@example.com>"` | No |
| `renovate_username` | Username of the Renovate bot account | `string` | `"renovate-bot"` | No |
| `renovate_autodiscover` | Enable autodiscovery of repositories | `bool` | `true` | No |
| `renovate_onboarding_config` | Onboarding configuration for Renovate | `string` | See variables.tf | No |
| `github_com_token` | GitHub.com token for fetching changelogs | `string` | `""` | No |
| `log_level` | Log level for Renovate | `string` | `"info"` | No |
| `extra_env_vars` | Additional environment variables | `list(string)` | `[]` | No |
| `upload_config_file` | Upload a config.js file to the container | `bool` | `true` | No |
| `role_id` | Vault AppRole Role ID | `string` | - | Yes |
| `secret_id` | Vault AppRole Secret ID | `string` | - | Yes |

## Outputs

| Output | Description |
|--------|-------------|
| `container_id` | ID of the Renovate container |
| `container_name` | Name of the Renovate container |
| `config_volume` | Name of the config volume |
| `cache_volume` | Name of the cache volume |
| `renovate_platform` | Platform configured for Renovate |
| `renovate_endpoint` | API endpoint configured for Renovate |

## Configuration Details

### Hardcoded Values

The following values are hardcoded and may need customization:

- **Docker Host**: `tcp://192.168.2.170:2376` (provider.tf)
- **Vault Address**: `https://wbyc-srv-docker01.bsdserver.lan:8200` (provider.tf)
- **MinIO Endpoint**: `https://minio.bsdserver.nl:443` (backend.tf)
- **MinIO Credentials**: Access and secret keys in backend.tf (consider moving to variables)
- **State File Path**: `home/docker/renovate/renovate.tfstate` (backend.tf)

### Security Considerations

✅ **Security Improvements**:

1. **No Privileged Mode**: Container runs without elevated privileges
2. **No Root User**: Runs as standard user
3. **No Docker Socket**: Docker socket is not mounted
4. **Resource Limits**: Memory limits prevent resource exhaustion
5. **Token Security**: Renovate token is marked as sensitive in Terraform
6. **Vault Integration**: DNS credentials stored securely in Vault

⚠️ **Security Notes**:

1. **Hardcoded Credentials**: MinIO credentials in `backend.tf` should be moved to environment variables
2. **Token Management**: Store `renovate_token` in Vault or use environment variables
3. **Repository Access**: Ensure bot user only has access to intended repositories
4. **Log Retention**: Logs are sent to Docker daemon - ensure proper retention policies
5. **Network Security**: Renovate connects to external APIs - ensure proper firewall rules

## Providers

This module uses the following Terraform providers:

- **docker** (kreuzwerker/docker v3.0.2): For Docker resource management
- **vault** (hashicorp/vault v3.25.0): For secrets management
- **dns**: For DNS record management with TSIG authentication

## Managing Configuration

### Option 1: Use Template File (Recommended)

The module includes a `config.js.tpl` template that automatically configures Renovate based on your variables. Set `upload_config_file = true` to use this method.

### Option 2: Manual Configuration

Mount a custom config.js file to the config volume:

```bash
# Create config.js
cat > config.js << 'EOF'
module.exports = {
  platform: 'gitea',
  endpoint: 'https://gitea.example.com/api/v1/',
  gitAuthor: 'Renovate Bot <renovate-bot@example.com>',
  username: 'renovate-bot',
  autodiscover: true,
  onboardingConfig: {
    $schema: 'https://docs.renovatebot.com/renovate-schema.json',
    extends: ['config:recommended'],
  },
};
EOF

# Copy to volume
docker run --rm -v renovate-config:/config -v $(pwd):/source alpine \
  cp /source/config.js /config/

# Restart container
docker restart renovate
```

### Option 3: Environment Variables Only

Set `upload_config_file = false` and rely solely on environment variables configured in the module.

## Scheduling Renovate Runs

Renovate can be scheduled using various methods:

### Option 1: Cron Job

```bash
# Add to crontab to run daily at 2 AM
0 2 * * * docker restart renovate
```

### Option 2: Gitea Actions/Workflows

Create `.gitea/workflows/renovate.yaml` in a dedicated repository:

```yaml
name: Renovate
on:
  schedule:
    - cron: '0 2 * * *'
  workflow_dispatch:

jobs:
  renovate:
    runs-on: ubuntu-latest
    steps:
      - name: Trigger Renovate
        run: |
          docker restart renovate || true
```

### Option 3: System Timer

Create a systemd timer for automated scheduling.

## Troubleshooting

### Container Won't Start

```bash
docker logs renovate
```

Check for:
- Invalid Gitea endpoint or token
- Network connectivity issues
- Missing configuration
- Resource limit issues

### Renovate Not Creating PRs

Verify:
1. Bot user has write access to repositories
2. Gitea token has correct permissions
3. Repositories have valid `renovate.json` configuration
4. Check logs for API errors: `docker logs renovate`

### Authentication Failures

- Verify token scopes in Gitea settings
- Ensure token hasn't expired
- Check endpoint URL is correct (should end with `/api/v1/`)
- Verify bot user account is active

### DNS Record Not Created

- Verify Vault DNS credentials are correct
- Check DNS server allows dynamic updates
- Ensure TSIG key has proper permissions

### Rate Limiting Issues

If you see rate limit errors:

1. Add `github_com_token` for GitHub.com changelog access
2. Configure `prConcurrentLimit` in repository config
3. Adjust scheduling to reduce API calls

## Maintenance

### Updating Renovate

```bash
# Pull latest image
docker pull renovate/renovate:latest

# Recreate container
terraform apply -replace=docker_container.renovate
```

### Viewing Logs

```bash
# Container logs
docker logs renovate -f

# Filter for specific repository
docker logs renovate 2>&1 | grep "repository-name"
```

### Backup

The Renovate data is stored in Docker volumes. To backup:

```bash
# Backup config
docker run --rm -v renovate-config:/data -v $(pwd):/backup alpine \
  tar czf /backup/renovate-config-backup.tar.gz /data

# Backup cache
docker run --rm -v renovate-cache:/data -v $(pwd):/backup alpine \
  tar czf /backup/renovate-cache-backup.tar.gz /data
```

### Restore

```bash
# Restore config
docker run --rm -v renovate-config:/data -v $(pwd):/backup alpine \
  tar xzf /backup/renovate-config-backup.tar.gz -C /

# Restore cache
docker run --rm -v renovate-cache:/data -v $(pwd):/backup alpine \
  tar xzf /backup/renovate-cache-backup.tar.gz -C /
```

## Advanced Configuration

### Custom Renovate Image

To use a specific version:

```hcl
module "renovate" {
  source = "./terraform-docker-renovate"

  renovate_image = "renovate/renovate:37.100.0"
  # ... other variables
}
```

### Multiple Platform Support

While this module is optimized for Gitea, you can configure it for other platforms:

```hcl
module "renovate_github" {
  source = "./terraform-docker-renovate"

  renovate_platform = "github"
  renovate_endpoint = "https://api.github.com/"
  renovate_token    = var.github_token
  # ... other variables
}
```

### SonarQube Integration

Add SonarQube scanning to Renovate PRs by configuring your repository's `renovate.json`:

```json
{
  "extends": ["config:recommended"],
  "postUpgradeTasks": {
    "commands": [
      "sonar-scanner -Dsonar.projectKey=myproject"
    ]
  }
}
```

## Integration with CI/CD

### Gitea Actions Integration

Renovate PRs can automatically trigger Gitea Actions workflows. Example `.gitea/workflows/test.yaml`:

```yaml
name: Test Dependencies
on:
  pull_request:
    branches: [main]

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Run Tests
        run: |
          docker-compose up -d
          docker-compose exec -T app npm test
```

### Pipeline Configuration

For automated testing and deployment:

1. Configure branch protection rules in Gitea
2. Require status checks to pass before merging
3. Enable auto-merge in `renovate.json` for passing PRs

## Best Practices

1. **Start with Manual Approval**: Don't enable automerge until you trust the process
2. **Use Dependency Dashboard**: Enable `"dependencyDashboard": true` for visibility
3. **Schedule Updates**: Use `schedule` to avoid overwhelming your team
4. **Group Updates**: Group related dependencies to reduce PR noise
5. **Test Updates**: Always have CI/CD tests run on Renovate PRs
6. **Monitor Logs**: Regularly check Renovate logs for errors
7. **Pin Versions**: Use semantic versioning tags instead of `latest`

## Example Workflow

1. **Initial Setup**:
   - Create Renovate bot user in Gitea
   - Generate access token with required scopes
   - Deploy this Terraform module
   - Add bot as collaborator to repositories

2. **Repository Configuration**:
   - Add `renovate.json` to repository root
   - Configure package rules and schedules
   - Enable dependency dashboard

3. **First Run**:
   - Renovate creates onboarding PR
   - Review and merge onboarding PR
   - Renovate starts scanning dependencies

4. **Ongoing**:
   - Renovate creates PRs for updates
   - CI/CD tests run automatically
   - Review and merge PRs
   - Monitor dependency dashboard

## Resources

- [Renovate Documentation](https://docs.renovatebot.com/)
- [Gitea Platform Configuration](https://docs.renovatebot.com/modules/platform/gitea/)
- [Self-Hosting Renovate](https://docs.renovatebot.com/examples/self-hosting/)
- [Configuration Options](https://docs.renovatebot.com/configuration-options/)
- [Renovate Docker Hub](https://hub.docker.com/r/renovate/renovate)

## License

This module is part of the webuildyourcloud automation infrastructure.

## Contributing

When contributing, ensure:
- Terraform code follows best practices
- Variables are properly documented
- Security implications are considered
- State backend configuration is tested
- Configuration examples are validated