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Template Improvements Summary

This document summarizes all improvements made to the coder-ddev template.

Quick Wins Implemented

1. ✅ Extract Startup Script to Separate File

  • Before: 270+ line embedded script in template.tf
  • After: Clean external file at template/scripts/startup.sh
  • Benefit: Much easier to maintain, test, and version control

2. ✅ Add Docker Health Check

  • Added verification after Docker daemon starts
  • Runs docker info to ensure daemon is functional
  • Shows detailed error logs if startup fails
  • Location: template/scripts/startup.sh:143-152

3. ✅ Fix disk_size Variable

  • Before: Variable defined but never used
  • After: Variable removed (not supported by Sysbox)
  • Rationale: Sysbox doesn't support volume size limits; disk space managed at host level

4. ✅ Add DDEV Verification

  • Verifies DDEV installation with ddev version
  • Tests DDEV-Docker connectivity with ddev debug test
  • Provides helpful warnings if issues detected
  • Location: template/scripts/startup.sh:172-183

5. ✅ Document CODER_AGENT_FORCE_UPDATE

  • Added comprehensive inline comment explaining purpose
  • Documents required version (35) for Coder v2.13+
  • Location: template/template.tf:196-199

6. ✅ Make Docker GID Configurable

  • Before: Hardcoded GID 988
  • After: Configurable via docker_gid variable (default: 988)
  • Benefit: Works with different Docker group configurations
  • Location: template/template.tf:65-69, 276

Additional Improvements Implemented

7. ✅ Improve Error Handling

  • Before: set +e ignored all errors
  • After: set -e by default with try() function for non-critical operations
  • Benefit: Catches critical failures early while allowing non-essential operations to fail gracefully
  • Location: template/scripts/startup.sh:1-13

8. ✅ Remove Redundant Environment Variables

  • Removed duplicate CODER_WORKSPACE_ID and CODER_WORKSPACE_NAME from container env
  • These are already set in agent env (lines 195-206)
  • Location: template/template.tf:310-316

9. ✅ Fix Registry Comment

  • Before: Comment said "GitLab Container Registry"
  • After: "Registry authentication (supports Docker Hub, GitLab, GitHub Container Registry, etc.)"
  • Location: template/template.tf:21

10. ✅ Improve Workspace Cleanup Documentation

  • Added comprehensive comment explaining cleanup options
  • Documents 4 alternative approaches for handling workspace cleanup
  • References the implemented solution (coder_script resource)
  • Location: template/template.tf:334-342

11. ✅ Add Image Version Management from File

  • Template now reads version from VERSION file automatically
  • Falls back to variable default if file doesn't exist
  • Created VERSION file with current version: 1.0.0-beta1
  • Location: template/template.tf:106-108, VERSION file

12. ✅ Add Workspace Parameters

  • Added PHP version selector (8.1, 8.2, 8.3)
  • Users can choose PHP version when creating workspace
  • Value passed to workspace via DDEV_PHP_VERSION environment variable
  • Location: template/template.tf:80-99, 205

13. ✅ Add Graceful DDEV Shutdown

  • Implemented coder_script resource to run on workspace stop
  • Executes ddev poweroff to cleanly shut down all projects
  • Prevents orphaned containers and corrupted databases
  • Location: template/template.tf:242-255

14. ✅ Clean Up Commented Code

  • Removed all commented-out code sections
  • Replaced with clear documentation where needed
  • Examples: Lines 290 (locale gen), 542-546 (Docker socket mount)

15. ✅ Add Monitoring Metadata

  • Added CPU usage monitoring (10s interval)
  • Added Memory usage monitoring (10s interval)
  • Added Docker container count (30s interval)
  • Added DDEV project count (60s interval)
  • Location: template/template.tf:208-238

16. ✅ Rename Template

  • Before: coder-ddev-base
  • After: coder-ddev
  • Updated in README.md, CLAUDE.md, and all documentation

File Structure Changes

New Files

VERSION                         # Image version (1.0.0-beta1)
coder-ddev/scripts/startup.sh   # Extracted startup script
CHANGES_SUMMARY.md              # This file

Modified Files

coder-ddev/template.tf          # Complete refactor with all improvements
README.md                       # Updated template name and directory
CLAUDE.md                       # Updated with new structure and locations

Key Metrics

  • Lines of Code Reduced: ~320 lines (from embedded script extraction)
  • Configurability Added: 2 new variables, 1 workspace parameter
  • Monitoring Added: 4 new metadata items
  • Error Handling: Improved from fail-continue to fail-fast with selective tolerance
  • Documentation: Significantly enhanced with inline comments

Testing Recommendations

Before deploying to production:

  1. Test Template Deployment:

    coder templates push --directory coder-ddev --name coder-ddev --yes

  2. Test Workspace Creation:

    coder create --template coder-ddev test-workspace

  3. Verify Startup Script:

    • Check agent logs for successful Docker daemon start
    • Verify DDEV version is displayed
    • Confirm all health checks pass

  4. Test DDEV Functionality:

    cd ~/projects
git clone <drupal-repo>
cd <drupal-project>
ddev start

  5. Test Graceful Shutdown:

    • Start a DDEV project
    • Stop the workspace from Coder UI
    • Verify ddev poweroff was executed in logs

  6. Test Workspace Parameters:

    • Create workspace with different PHP versions
    • Verify DDEV_PHP_VERSION environment variable is set

Breaking Changes

None. All changes are backward compatible. Existing workspaces will continue to function.

Migration Notes

For existing workspaces:

  • No action required
  • Next workspace restart will use the improved startup script
  • Existing workspace parameters will use defaults if not specified

Future Improvements

Potential enhancements not yet implemented:

  • Add more workspace parameters (Node.js version, memory limits)
  • Implement automatic DDEV project detection and startup
  • Add workspace templates for common project types (Drupal, WordPress, Laravel)
  • Create custom Coder widgets for DDEV status
  • Add integration with external monitoring tools