docker-stack.yml

version: "3"
services:

  db:
    image: postgres
    environment:
        POSTGRES_PASSWORD: password123
    volumes:
      - db-data:/var/lib/postgresql/data
    ports:
        - "5432:5432"
    networks:
      - backend
    deploy:
      placement:
        constraints: [node.role == manager]

  web:      
      image: twtrubiks/my_django
      # volumes:
      #   - api-data:/docker_api
      ports:
        - "8000:8000"
      networks:
        - backend
      depends_on:
        - db
      deploy:
        replicas: 10
        update_config:
          parallelism: 2
        restart_policy:          
          condition: on-failure  

  visualizer:
    image: dockersamples/visualizer:stable
    ports:
      - "8080:8080"
    stop_grace_period: 1m30s
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    deploy:
      placement:
        constraints: [node.role == manager]

networks:  
  backend:

volumes:
  db-data:
  # api-data: