wordpress 错误：在文件“./docker-compose.yml”中，卷必须是映射而不是字符串

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

提问by Richard

Question:Why do I get this error?

问题：为什么会出现此错误？

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

错误：在文件“./docker-compose.yml”中，卷“mariavolume”必须是映射而不是字符串。

My docker-compose file is almost identical to this one: https://docs.docker.com/compose/wordpress/

我的 docker-compose 文件几乎与这个相同：https: //docs.docker.com/compose/wordpress/

version: '2'
services:
  wordpress:
    image: wordpress:latest
    restart: always
    depends_on:
      - db
    ports:
      - 8080:80
    environment:
      WORDPRESS_DB_PASSWORD: example
      WORDPRESS_DB_HOST: 3306
  db:
    image: mariadb
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
    volumes:
      - maria_volume: /var/lib/mysql
volumes:
  maria_volume: ~/mariadb

回答by Dhiraj Gupta

In my case this was happening because I missed adding a :after the volume name.

在我的情况下，发生这种情况是因为我错过了:在卷名后添加一个。

Instead of:

代替：

volumes:
    - mysqldata:

I had typed:

我输入了：

volumes:
    - mysqldata

docker-compose upgave me the same error as above.

docker-compose up给了我与上面相同的错误。

回答by DaNeSh

Unfortunately, there is no such a feature.

不幸的是，没有这样的功能。

You can't map a top-level volume in docker-compose.

您无法在 docker-compose 中映射顶级卷。

Here are the options:

以下是选项：

• Adding volume per container and map it there. (like what Daniel did here)

• Create a volume outside of the compose (with mapping) and use it in your compose.

  volumes:
     maria_volume: 
         external:
             name: volume-name
  

• 添加每个容器的卷并将其映射到那里。（就像丹尼尔在这里所做的那样）

• 在撰写之外创建一个卷（带映射）并在你的撰写中使用它。

  volumes:
     maria_volume: 
         external:
             name: volume-name
  

回答by JonWillis

I've just tackled this issue myself. If you just want a volume to store data, then do as below. This will create/reuse a volumethat is persisted to disk as part of the Dockergraph driver.

我刚刚自己解决了这个问题。如果您只是想要一个卷来存储数据，请执行以下操作。这将创建/重用volume作为Docker图形驱动程序的一部分持久保存到磁盘的。

The next question is where is this?.

下一个问题是这是哪里？.

You can find it inside the docker image - Default Location -

您可以在 docker 镜像中找到它 - 默认位置 -

C:\Users\Public\Documents\Hyper-V\Virtual hard disks

C:\Users\Public\Documents\Hyper-V\虚拟硬盘

db:
  image: mariadb
  restart: always
  environment:
    MYSQL_ROOT_PASSWORD: example
  volumes:
    - maria_volume: /var/lib/mysql

volumes:
  maria_volume:

Of course, if you are after mapping a host directory into docker rather than having it inside the Dockergraph driver. Then you can do it as follows.

当然，如果您将主机目录映射到 docker 而不是将它放在Docker图形驱动程序中。然后你可以按如下方式进行。

db:
  image: mariadb
  restart: always
  environment:
    MYSQL_ROOT_PASSWORD: example
  volumes:
    - maria_volume: /var/lib/mysql

volumes:
  maria_volume:
    driver: local
    driver_opts:
      o: bind
      type: none
      device: /C/mariadb

Please note, when mapping over host directories as volume (at least on windows) you can have issues with read/writepermissions, something I have yet to resolve myself.

请注意，将主机目录映射为卷（至少在 Windows 上）时，您可能会遇到read/write权限问题，这是我自己尚未解决的问题。

回答by Mohsen ZareZardeyni

try this:

尝试这个：

    volumes:
        - maria_volume: /var/lib/mysql
volumes:
    maria_volume: 
        external:
            name: ~/mariadb

回答by Akshay Vijay Jain

correct syntax for volume is
volumes: first:
where first is just a placeholder name to be used for volume

卷的正确语法是
volumes: first:
first 只是用于卷的占位符名称

回答by kinjelom

Try this:

尝试这个：

version: '2'
services:
  ...
  db:
    image: mariadb
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
    volumes:
      - ~/mariadb:/var/lib/mysql

回答by Daniel

I was running into the same issue as yourself and as a last act of despair I tried putting

我遇到了和你一样的问题，作为最后的绝望行为，我试着把

volumes:
  - maria_volume: /var/lib/mysql

before

前

environment:
  MYSQL_ROOT_PASSWORD: example

I'm not sure what kind of magic applied here but in my case, it worked

我不确定这里应用了什么样的魔法，但就我而言，它奏效了

Let me know!

让我知道！

回答by Deepak Sharma

For me this works:

对我来说这有效：

In #docker_compose.yml:

在#docker_compose.yml 中：

volumes:
  postgres_data: {}
  static: { }