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

services:
  db:
    image: postgres:latest
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    ports:
      - 5432:5432
  web-app:
    image: web-app:latest
    ports:
      - 8080:8080
    links:
      - db