Docker

Patterns for writing production-ready Dockerfiles and Compose configurations: minimal images, security hardening, layer caching, and health checks.

When to Use

• Writing or reviewing a Dockerfile
• Setting up docker-compose for local dev or deployment
• Containerizing a Node.js app (examples use Node.js; patterns apply to any runtime)
• Optimizing image size or build time

Don't use for:

• Kubernetes manifests (separate concern)
• CI/CD pipeline configuration
• Cloud-specific container registries