docker-compose.yml 文件中＆符号的含义

今天在搭建一个superset，发现docker-compose.yml文件有个&部分看不懂。

x-superset-image: &superset-image apache/superset:latest-dev
x-superset-user: &superset-user root
x-superset-depends-on: &superset-depends-on
  - db
  - redis
x-superset-volumes: &superset-volumes
  # /app/pythonpath_docker will be appended to the PYTHONPATH in the final container
  - ./docker:/app/docker
  - ./superset:/app/superset
  - ./superset-frontend:/app/superset-frontend
  - superset_home:/app/superset_home
  - ./tests:/app/tests

简单的例子

version: "3.4"

# x-docker-data is an extension and when docker-compose
# parses the YAML, it will not do anything with it

x-docker-data: &docker-file-info
  build:
    context: .
    dockerfile: Dockerfile

services:
  some_service_a:
    <<: *docker-file-info
    restart: on-failure
    ports:
      - 8080:9090
  some_service_b:
    <<: *docker-file-info
    restart: on-failure
    ports:
      - 8080:9595

然后经过docker-compose config 输出可以解析到内容，然后就能看明白了

root@kafka tmp]# docker-compose config
services:
  some_service_a:
    build:
      context: /tmp
      dockerfile: Dockerfile
    ports:
    - published: 8080
      target: 9090
    restart: on-failure
  some_service_b:
    build:
      context: /tmp
      dockerfile: Dockerfile
    ports:
    - published: 8080
      target: 9595
    restart: on-failure
version: '3.4'

其实描点那部分是yml的内容，有关内容可以找一下遵循EXTRA YAML FEATURES部分参考学习。

最后

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