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MIGRATION_GUIDE.md - From kaniko-builder to hephy-builder

Status: ✅ Transformation Complete - Active Migration Support
Purpose: Guide existing users through hephy-builder evolution and new feature adoption

🎯 Migration Status: Seamless Transition

✅ What's Already Complete

  • Documentation transformation: Professional docs/ structure with comprehensive navigation
  • Vision definition: Complete hephy-builder roadmap and heritage connection
  • Backward compatibility: All existing build-config.yaml files continue working unchanged
  • Infrastructure: Multi-arch builds remain fully functional

🚀 What's Available Now

  • Enhanced documentation: Better guides, examples, and troubleshooting
  • Community infrastructure: Clear contribution paths and GitHub issues
  • Heritage understanding: Connection to Deis Workflow legacy and modern vision
  • Development roadmap: Transparent path to "git push hephy main" experience

Migration Phases

Phase 1: Backward Compatibility (Immediate)

Current kaniko-builder users can continue without changes

# Existing build-config.yaml works as-is
upstream_repo: https://github.com/owner/repo
dockerfile_path: Dockerfile
platforms:
  - linux/amd64  
  - linux/arm64
additional_tags:
  - latest

Phase 2: Backend Selection (Opt-in)

Add backend selection for optimization

# Enhanced build-config.yaml
build_backend: kaniko  # Default, no change
# OR
build_backend: ko      # Optimize Go applications
# OR  
build_backend: spin    # WebAssembly builds

Phase 3: Platform Expansion (Choose your CI)

Add GitHub Actions support while maintaining GitLab CI

# New .hephy/config.yaml (optional)
build_backend: ko
ci_platforms:
  - gitlab
  - github  # Enable GitHub Actions
platforms:
  - linux/amd64
  - linux/arm64

Step-by-Step Migration

Step 1: Update Documentation References

# Update any references in your documentation
# kaniko-builder → hephy-builder
# "container builds" → "modern PaaS builds"

Step 2: Evaluate Build Backend

# For Go applications
build_backend: ko      # Faster builds, smaller images

# For complex Dockerfiles  
build_backend: buildkit # Advanced features

# For WebAssembly
build_backend: spin     # Modern WASM deployment

# For maximum compatibility
build_backend: kaniko   # Existing behavior (default)

Step 3: Choose CI Platform Strategy

  • GitLab CI only: No changes required
  • GitHub Actions only: Migrate workflows
  • Both platforms: Hybrid configuration
  • Enterprise: Custom runner setup

[TODO: Create platform migration scripts]

Step 4: Test New Features

# Gradual adoption approach
directories:
  old-app/:
    build_backend: kaniko    # Keep existing
  new-service/:  
    build_backend: ko        # Optimize new projects
  experimental/:
    build_backend: spin      # Try WebAssembly

Configuration Mapping

Kaniko Backend (Default)

# No changes needed - existing configs work
build_backend: kaniko  # Optional, this is default
dockerfile_path: Dockerfile
context_path: .

Ko Backend (Go Optimization)

build_backend: ko
ko_config:
  import_path: ./cmd/server
  base_image: distroless.dev/static-debian12
  ldflags: ["-s", "-w"]

Spin Backend (WebAssembly)

build_backend: spin
spin_config:
  template: http-rust
  component_name: my-wasm-app
platforms:
  - wasm32-wasi  # Different platform target

[TODO: Complete configuration examples for all backends]

Troubleshooting Common Issues

Build Backend Selection

# Problem: Don't know which backend to choose
# Solution: Start with current (kaniko), optimize later

# Go application?
build_backend: ko

# Complex Dockerfile with BuildKit features?
build_backend: buildkit

# Want to try WebAssembly?
build_backend: spin

# Maximum compatibility?
build_backend: kaniko  # (default)

Platform Migration

# Problem: GitLab CI works, GitHub Actions fails
# Solution: Check runner availability, secret configuration

# Problem: Authentication differences between platforms  
# Solution: Use platform-specific credential configuration

[TODO: Add common error scenarios and solutions]

Performance Optimization

Build Speed Improvements

  • Ko: Typically 2-3x faster than Kaniko for Go apps
  • BuildKit: Better caching, parallel builds
  • Spin: Fast WASM compilation

Image Size Reductions

  • Ko: Distroless base images, optimized binaries
  • Spin: WASM modules typically smaller than containers

[TODO: Add benchmark comparisons]

Feature Parity Matrix

Feature kaniko-builder hephy-builder Notes
Multi-arch builds ✅ ✅ Same functionality
Remote repositories ✅ ✅ Same pre-clone system
Additional tags ✅ ✅ Same crane integration
GitLab CI ✅ ✅ Maintained compatibility
GitHub Actions ❌ 🔧 New feature
Ko builds ❌ 🔧 New backend
Spin builds ❌ 🔧 New backend

[TODO: Complete feature comparison table]

Migration Timeline

Immediate (Available Now)

  • ✅ Backward compatibility maintained
  • ✅ New backend selection (opt-in)
  • ✅ Documentation updates

Short Term (Next Release)

  • 🔧 GitHub Actions workflows
  • 🔧 Platform portability tools
  • 🔧 Migration automation

Long Term (Future Releases)

  • 🔧 SpinKube integration
  • 🔧 Advanced enterprise features
  • 🔧 Community templates

Support and Community

Getting Help

  • GitHub Issues: Technical problems and feature requests
  • Documentation: Updated guides and examples
  • Community: Deis/Hephy heritage discussions

Contributing Back

  • Backend implementations: New build system support
  • Platform adapters: Additional CI/CD platforms
  • Documentation: Usage examples and best practices

[TODO: Set up community channels, contribution guidelines]