version: "3"
services:
    echo:
      image: busybox
      command: ["/bin/busybox", "echo", "Zero"]
      ports:
        - '1234:1234'
      environment:
          - FOO=original
          - BAR=original
#      volumes:
#        - ./original:/foo
#        - ./original:/bar
    echo1:
      extends:
        service: echo
      command: ["/bin/busybox", "echo", "One"]
      ports:
        - '12345:12345'
#      volumes:
#        - ./local:/bar
#        - ./local:/baz
    env1:
      extends:
        service: echo
      command: ["/bin/busybox", "env"]
      environment:
        - BAR=local
        - BAZ=local