version: "3"
networks:
    net1:
    net2:
services:
    web1:
      image: busybox
      #container_name: web1
      hostname: web1
      command: ["/bin/busybox", "httpd", "-f", "-h", "/var/www/html", "-p", "8001"]
      working_dir: /var/www/html
      networks:
      - net1
      ports:
        - 8001:8001
      volumes:
        - ./test1.txt:/var/www/html/index.txt:ro,z
    web2:
      image: busybox
      #container_name: web2
      hostname: web2
      command: ["/bin/busybox", "httpd", "-f", "-h", "/var/www/html", "-p", "8001"]
      working_dir: /var/www/html
      networks:
      - net1
      - net2
      ports:
        - 8002:8001
      volumes:
        - ./test2.txt:/var/www/html/index.txt:ro,z
    web3:
      image: busybox
      command: ["/bin/busybox", "httpd", "-f", "-h", "/var/www/html", "-p", "8001"]
      working_dir: /var/www/html
      networks:
        net1:
          aliases:
          - alias11
          - alias12
        net2:
          aliases:
          - alias21
      volumes:
        - ./test2.txt:/var/www/html/index.txt:ro,z