Docker Compose报错：services.dockeroperator不允许额外属性attach

我的docker-compose.yaml配置如下：

name: mydemo

volumes:
  operator-volume:
    driver: local

services:
  dockeroperator:
    build:
      dockerfile: .docker/Dockerfile
    volumes:
      - operator-volume:/terraform/dev
      - ./.kube:/root/.kube
      - ./utils:/operator/examples
    attach: false
    env_file: ".env"

执行docker-compose build时触发报错：

services.dockeroperator Additional property attach is not allowed

我的环境版本：

$docker version
Docker version 20.10.17, build 100c701
$docker compose version
Docker Compose version v2.7.0

attach并不是Docker Compose服务配置里的合法字段，不在Compose规范定义范围内，所以配置校验不通过。

直接删除配置中attach: false这一行即可，修改后的配置文件如下：

name: mydemo

volumes:
  operator-volume:
    driver: local

services:
  dockeroperator:
    build:
      dockerfile: .docker/Dockerfile
    volumes:
      - operator-volume:/terraform/dev
      - ./.kube:/root/.kube
      - ./utils:/operator/examples
    env_file: ".env"

重新运行docker-compose build就能正常完成镜像构建了。

内容的提问来源于stack exchange，提问作者Saurav K