java-tutorials/docker-modules/docker-compose/depends-on_vs_links/docker-compose-network.yml

services:
  db:
    image: postgres:latest
    restart: always
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    ports:
      - 5432:5432
    volumes:
      - db:/var/lib/postgresql/data
    networks:
      - mynet

  web-app:
    image: web-app:latest
    depends_on:
      - db
    networks:
      - mynet
    ports:
      - 8080:8080
    environment:
      DB_HOST: db
      DB_PORT: 5432
      DB_USER: postgres
      DB_PASSWORD: postgres
      DB_NAME: postgres

networks:
  mynet:
    driver: bridge

volumes:
  db:
    driver: local