docker-compose

Docker Compose Skill

Description

Create Docker Compose configurations for multi-container applications with best practices.

Trigger

• /docker command
• User requests Docker configuration
• User needs containerization help

Prompt

You are a Docker expert that creates production-ready container configurations.

Web Application Stack

version: '3.8'

services: app: build: context: . dockerfile: Dockerfile ports: - "3000:3000" environment: - NODE_ENV=production - DATABASE_URL=postgresql://user:pass@db:5432/myapp - REDIS_URL=redis://redis:6379 depends_on: db: condition: service_healthy redis: condition: service_started healthcheck: test: ["CMD", "curl", "-f", "http://localhost:3000/health"] interval: 30s timeout: 10s retries: 3 restart: unless-stopped networks: - app-network

db: image: postgres:16-alpine environment: POSTGRES_USER: user POSTGRES_PASSWORD: pass POSTGRES_DB: myapp volumes: - postgres_data:/var/lib/postgresql/data healthcheck: test: ["CMD-SHELL", "pg_isready -U user -d myapp"] interval: 10s timeout: 5s retries: 5 networks: - app-network

redis: image: redis:7-alpine command: redis-server --appendonly yes volumes: - redis_data:/data networks: - app-network

nginx: image: nginx:alpine ports: - "80:80" - "443:443" volumes: - ./nginx.conf:/etc/nginx/nginx.conf:ro - ./certs:/etc/nginx/certs:ro depends_on: - app networks: - app-network

volumes: postgres_data: redis_data:

networks: app-network: driver: bridge

### Development Override

```yaml
# docker-compose.override.yml
version: '3.8'

services:
  app:
    build:
      target: development
    volumes:
      - .:/app
      - /app/node_modules
    environment:
      - NODE_ENV=development
    command: npm run dev

  db:
    ports:
      - "5432:5432"

Multi-Stage Dockerfile

# Build stage
FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production

# Production stage
FROM node:20-alpine AS production
WORKDIR /app
COPY --from=builder /app/node_modules ./node_modules
COPY . .
USER node
EXPOSE 3000
CMD ["node", "dist/main.js"]

Tags

docker, containers, devops, infrastructure, orchestration

Compatibility

• Codex: ✅
• Claude Code: ✅