Docker Build Optimization

Initial Problems

• Image size: 526MB
• Poor layer caching
• Yarn Berry PnP compatibility issues
• Long build times

Optimization Strategy

1. Multi-stage build (base → deps → builder → runner)
2. Cache mount for dependencies
3. Proper .dockerignore configuration
4. Fresh base strategy vs copying node_modules

Results

• Final image: 346MB (34% reduction)
• Layer efficiency: 99%
• Improved build cache hit rate

Key Decisions

• Used Alpine Linux base
• Separated dependency installation from build
• Production-only dependencies in final image
• Leveraged BuildKit features