version: '3'

networks:
  cluster:
    driver: bridge

services:

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

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

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


  # --- NGINX ---
  nginx:
      image: nginx:latest
      ports:
        - '8081:80'
      volumes: 
        - ./nginx/config.conf:/etc/nginx/nginx.conf:ro
      healthcheck:
        test: ["CMD", "service", "nginx", "status"]
      networks:
        - cluster