docker-compose-swarm.yml

version: '3.8'

services:

  web:
    image: mjhea0/flask-docker-swarm_web:latest
    deploy:
      replicas: 1
      restart_policy:
        condition: on-failure
      placement:
        constraints: [node.role == worker]
    expose:
      - 5000
    environment:
      - FLASK_ENV=production
      - APP_SETTINGS=project.config.ProductionConfig
      - DB_USER=postgres
      - DB_PASSWORD=postgres
    secrets:
      - secret_code
    depends_on:
      - db
    networks:
      - app
    healthcheck:
      test: curl --fail http://localhost:5000/ping || exit 1
      interval: 10s
      timeout: 2s
      retries: 5

  db:
    image: mjhea0/flask-docker-swarm_db:latest
    deploy:
      replicas: 1
      restart_policy:
        condition: on-failure
      placement:
        constraints: [node.role == manager]
    volumes:
      - data-volume:/var/lib/postgresql/data
    expose:
      - 5432
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    networks:
      - app

  nginx:
    image: mjhea0/flask-docker-swarm_nginx:latest
    deploy:
      replicas: 1
      restart_policy:
        condition: on-failure
      placement:
        constraints: [node.role == worker]
    ports:
      - 80:80
    depends_on:
      - web
    networks:
      - app

  visualizer:
    image: dockersamples/visualizer:latest
    ports:
      - 8080:8080
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
    deploy:
      placement:
        constraints: [node.role == manager]
    networks:
      - app

networks:
  app:
    driver: overlay

volumes:
  data-volume:
    driver: local

secrets:
  secret_code:
    external: true