wordpress - 错误 : In file './docker-compose.yml' , 卷必须是映射而不是字符串

Question

问题:
为什么我会收到这个错误？

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

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

Answer 1

就我而言，这是因为我错过了添加 :在卷名之后。

代替:

volumes:
    - mysqldata:

我输入了:

volumes:
    - mysqldata

docker-compose up给了我与上面相同的错误。