Docker Expert

When to Use

• Creating or reviewing Dockerfiles
• Optimizing image size or build performance
• Hardening container security
• Setting up Docker Compose for multi-service apps
• Debugging container networking, volumes, or runtime issues
• Containerizing applications (Node.js, Python, Go, Java, Rust)

Out of scope (recommend dedicated skills):

• Kubernetes orchestration → kubernetes expert
• CI/CD pipelines → github-actions expert
• Cloud-specific container services (ECS, Cloud Run) → devops expert

Core Principles

1. Layer caching — order layers from least to most frequently changing