docker-compose-with-depends-on.yml

version: '3'
services:
  postgres:
    build:
      context: .
      dockerfile: postgres/Dockerfile
    image: postgres:tag
    env_file: .env
    ports:
      - '5432:5432'
  backend:
    build:
      context: .
      dockerfile: backend/Dockerfile
    image: backend
    environment:
      database:postgresql://user:password@postgres:5432'
    depends_on:
      - postgres
    ports:
      - '8000:8000'
  frontend:
    build:
      context: .
      dockerfile: frontend/Dockerfile
    image: frontend
    ports:'5000:5000'