Docker Compose-在多个容器之间共享命名卷 [英] Docker Compose - Share named volume between multiple containers

问题描述

我正在使用docker-compose和v3。我正在尝试在Docker中装载卷：

I'm using docker-compose and v3. I'm trying to mount a volume in docker:

./ appdata：/ appdata

我想将此作为体积，然后从多个容器中引用该体积。 卷配置参考仅显示 data-volume：作为命名卷，没有任何值，因此看起来不像上面。

I'd like to have this as a volume and then reference that volume from multiple containers. The volume configuration reference only shows data-volume: as a named volume, with no value, so it doesn't look like the above.

services:

    nginx:
        build: ./nginx/
        ports:
            - 80:80
        links:
            - php
        volumes:
            - app-volume

    php:
        build: ./php/
        expose:
            - 9000
        volumes:
            - app-volume

volumes:
     app-volume: ./appdata:/appdata

这给了我：

错误：文件'./docker-compose.yml'中，卷 app-volume必须是映射而不是字符串。

ERROR: In file './docker-compose.yml', volume 'app-volume' must be a mapping not a string.

很明显，我知道我需要更改 volumes 键/值对，但是我不确定如何进行更改，以便我可以在服务之间共享卷。

Obviously I know I need to change the volumes key/value pair, but I'm not sure how to change this so I can share a volume between services.

我还检查了 volumes_from ，但这实际上只允许从其他容器继承。我见过有人在另一个包含他们想要的映射的容器上使用 volumes_from ，但是使用了 command：true 来设置容器从未真正运行过，在我看来就像是黑客。

I've also checked out volumes_from but this effectively just allows inheritance from other containers. I've seen someone use volumes_from on another container that contains the mapping they want, but with command: true set so that the container is never actually run, which to me just seems like a hack.

我该怎么做？

注意，我做具有以下工作：

Note, I do have the following working:

nginx:
    volumes:
        - ./appdata:/appdata
php:
    volumes:
        - ./appdata:/appdata

但这只是重复，我希望命名卷可以帮助我避免：-）

But that's just duplication and is something I'm hoping a named volume could help me avoid :-)

推荐答案

可以通过以下方式在容器之间共享命名卷：

The named volumes can be shared across containers in the following way:

services:
    nginx:
        build: ./nginx/
        ports:
            - 80:80
        links:
            - php
        volumes:
            - app-volume:location_in_the_container

    php:
        build: ./php/
        expose:
            - 9000
        volumes:
            - app-volume:location_in_the_container

volumes:
     app-volume: 

这是我用来更好理解的示例配置。我将从 web 容器生成的静态文件暴露给名为 static-content 的命名卷，然后读取该卷并由 nginx 容器提供服务：

Here's an example config that I use for better understanding. I'm exposing the static files generated from my web container to a named volume called static-content which is then read and served by the nginx container:

services:
  nginx:
    container_name: nginx
    build: ./nginx/

    volumes:
      - static-content:/usr/src/app

  web:
    container_name: web
    env_file: .env
    volumes:
      - static-content:/usr/src/app/public
    environment:
      - NODE_ENV=production

    command: npm run package

volumes:
  static-content:

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