docker-compose.yml，网络必须是映射，而不是数组

Question

不确定 yaml 缩进是如何工作的。定义应用程序通信的外部网络时出现错误

./docker-compose.yml', network must be a mapping, not an array

    version : '3'

    services:
       zmq_sub:
         image: zmq_sub
       zmq_pub:
         image: zmq_pub
         depends_on:
           - zmq_sub 

    networks:
       - zmq_network:
         external: true

Answer 1

请注意每个容器的节与末尾的卷和网络列表之间的语法差异：

<...snip...>
    volumes:
      - "database-volume:/var/lib/postgresql/data"    ## <---- dash !
    networks:
      - foo        ### <---- dash!
      - private    ### <----- dash!
volumes:
  foovol:      # NO dash!
  barvol:     # NO dash!
networks:
  dntp:       # NO dash!
  private:    # NO dash!

Answer 2

version: "3.8"

services:
  my_app:
    image: some_image
    networks:
      - ingress

networks:
  ingress:
    name: existing_docker_network
    external: true

或者使用默认堆栈网络名称

version: "3.8"

services:
  my_app:
    image: some_image

networks:
  default:
    name: existing_docker_network
    external: true

在我看来，您正在使用旧的 docker-compose 格式（~2）来执行新版本（3）