docker-compose端口与expose之间有什么区别

Ports定义为：

Expose ports. Either specify both ports (HOST:CONTAINER), or just the container port (a random host port will be chosen).

> docker-compose.yml中提到的端口将在docker-compose启动的不同服务之间共享.
>端口将暴露给主机到随机端口或给定端口.

我的docker-compose.yml看起来像：

mysql:
  image: mysql:5.7
  ports:
    - "3306"

如果我做docker-compose ps,它看起来像：

  Name                     Command               State            Ports
-------------------------------------------------------------------------------------
  mysql_1       docker-entrypoint.sh mysqld      Up      0.0.0.0:32769->3306/tcp

Expose定义为：

Expose ports without publishing them to the host machine – they’ll only be accessible to linked services. Only the internal port can be specified.

端口不会暴露给主机,只会暴露给其他服务.

mysql:
  image: mysql:5.7
  expose:
    - "3306"

如果我做docker-compose ps,它看起来像：

  Name                  Command             State    Ports
---------------------------------------------------------------
 mysql_1      docker-entrypoint.sh mysqld   Up      3306/tcp