# Use official Node.js base image
FROM node:20-alpine
 
# Set working directory
WORKDIR /app
 
# Copy dependency files first (for layer caching)
COPY package*.json ./
RUN npm ci --only=production
 
# Copy source code
COPY . .
 
# Build the app
RUN npm run build
 
# Expose port
EXPOSE 3000
 
# Start command
CMD ["npm", "start"]

# docker-compose.yml
version: '3.8'
services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - DATABASE_URL=postgresql://postgres:password@db:5432/mydb
    depends_on:
      - db
    volumes:
      - .:/app          # Hot reload in dev
      - /app/node_modules
 
  db:
    image: postgres:16
    environment:
      POSTGRES_PASSWORD: password
      POSTGRES_DB: mydb
    volumes:
      - pgdata:/var/lib/postgresql/data
 
volumes:
  pgdata:

# Start everything
docker-compose up
 
# Run in background
docker-compose up -d
 
# Stop everything
docker-compose down

docker build -t myapp .        # Build image
docker run -p 3000:3000 myapp  # Run container
docker ps                       # List running containers
docker logs <container-id>      # View logs
docker exec -it <id> sh         # Shell into container
docker system prune             # Clean up everything