问顶级属性"app01“无效。此合成文件的有效顶级部分包括:版本、服务、网络、卷和扩展

EN

version: '2.1'
control:
  build: ./env
  hostname: control
  links:
    - lb01
    - app01
    - app02
    - db01
  ports:
    - "2200:22"
  volumes:
    - ./:/work
lb01:
  build: ./env
  hostname: lb01
  links:
    - app01
    - app02
  ports:
    - "2201:22"
    - "8001:80"
app01:
  build: ./env
  hostname: app01
  links:
    - db01
  ports:
    - "2211:22"
    - "8081:80"
app02:
  build: ./env
  hostname: app02
  links:
    - db01
  ports:
    - "2212:22"
    - "8082:80"
db01:
  build: ./env
  hostname: db01
  ports:
    - "2222:22"
    - "3306:3306"

ERROR: The Compose file '.\docker-compose.yml' is invalid because:
Invalid top-level property "app01". Valid top-level sections for this Compose file are version, services, networks, volumes, and extensions starting with "x-".

You might be seeing this error because you're using the wrong Compose file version. Either specify a supported version (e.g "2.2" or "3.3") and place your service definitions under the `services` key, or omit the `version` key and place your service definitions at the root of the file to use version 1.
For more on the Compose file format versions, see https://docs.docker.com/compose/compose-file/