docker-patterns

npx skills add mturac/everything-openai-codex --skill docker-patterns --agent codex

Same command for any agent — swap --agent for claude-code, cursor, copilot.

# Docker Patterns Docker and Docker Compose best practices for containerized development. ## When to Activate - Setting up Docker Compose for local development - Designing multi-container architectures - Troubleshooting container networking or volume issues - Reviewing Dockerfiles for security and size - Migrating from local dev to containerized workflow ## Docker Compose for Local Development ### Standard Web App Stack ```yaml # docker-compose.yml services: app: build: context: . target: dev # Use dev stage of multi-stage Dockerfile ports: - "3000:3000" volumes: - .:/app # Bind mount for hot reload - /app/node_modules # Anonymous volume -- preserves container deps environment: - DATABASE_URL=postgres://postgres:postgres@db:5432/app_dev - REDIS_URL=redis://redis:6379/0 - NODE_ENV=development depends_on: db: condition: service_healthy redis: condition: service_started command: npm run dev db: image: postgres:16-alpine ports: - "5432:5432" environment: POSTGRES_USER: postgres POSTGRES_PASSWORD: postgres POSTGRES_DB: app_dev volumes: - pgdata:/var/lib/postgresql/data - ./scripts/init-db.sql:/docker-entrypoint-initdb.d/init.sql healthcheck: test: ["CMD-SHELL", "pg_isready -U postgres"]

Development (auto-loads override)
docker compose up
Production
docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d
View logs
docker compose logs -f app           # Follow app logs
docker compose logs --tail=50 db     # Last 50 lines from db
Execute commands in running container
docker compose exec app sh           # Shell into app
docker compose exec db psql -U postgres  # Connect to postgres