DockerComposeLabs/Labs/007-Networks/docker-compose-simple.yml at master · nirgeier/DockerComposeLabs · GitHub

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# Simple Multi-Network Docker Compose Example
# This demonstrates basic multi-network concepts with fewer services

services:
  # Frontend service
  web:
    image: nginx:alpine
    ports:
      - "80:80"
    networks:
      - frontend
      - dmz
    volumes:
      - ./web/nginx.conf:/etc/nginx/nginx.conf
    depends_on:
      - api

  # API service
  api:
    build: ./api
    networks:
      - frontend
      - backend
    environment:
      - DATABASE_URL=postgresql://user:pass@db:5432/mydb
    depends_on:
      - db
      - cache

  # Database service
  db:
    image: postgres:15-alpine
    environment:
      - POSTGRES_DB=mydb
      - POSTGRES_USER=user
      - POSTGRES_PASSWORD=pass
    networks:
      - backend
    volumes:
      - db_data:/var/lib/postgresql/data

  # Cache service
  cache:
    image: redis:7-alpine
    networks:
      - backend
    volumes:
      - cache_data:/data

  # Admin interface
  admin:
    image: adminer:latest
    ports:
      - "8080:8080"
    networks:
      - backend
      - dmz
    depends_on:
      - db

# Network definitions
networks:
  # Frontend network - web-facing services
  frontend:
    driver: bridge
    ipam:
      config:
        - subnet: 172.20.0.0/24

  # Backend network - internal services
  backend:
    driver: bridge
    ipam:
      config:
        - subnet: 172.21.0.0/24

  # DMZ network - admin/management interfaces
  dmz:
    driver: bridge
    ipam:
      config:
        - subnet: 172.22.0.0/24

# Volume definitions
volumes:
  db_data:
  cache_data: