version: '3'

networks:
  cluster:
    external: false

services:

# 3 versions of the same app responding to host's 3001-3
  app1:
    build: .
    environment:
      - APP_NAME=App1
    ports:
      - "3001:3000"
    networks:
      - cluster

  app2:
    build: .
    environment:
      - APP_NAME=App2
    ports:
      - "3002:3000"
    networks:
      - cluster

  app3:
    build: .
    environment:
      - APP_NAME=App3
    ports:
      - "3003:3000"
    networks:
      - cluster


  # --- NGINX ---
  nginx:
      image: nginx:latest
      ports:
        - '8088:80'
      deploy:
        replicas: 4
        update_config:
          parallelism: 2
          order: start-first
          failure_action: rollback
          delay: 10s
        rollback_config:
          parallelism: 0
          order: stop-first
        restart_policy:
          condition: any
          delay: 5s
          max_attempts: 3
          window: 120s
      healthcheck:
        test: ["CMD", "service", "nginx", "status"]
      networks:
        - cluster