Docker 卷必須是一個映射，而不是一個字符串

Question

我在./wordpress/docker-compose.yaml有以下文件：

version: '3.3'

serivces:
  db:
    image: mysql:5.7
    volumes:
      - db_data:/var/lib/mysql
    restart: always
    evironment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress

  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    ports:
      - "8000:80"
    volumes:
      - ./:/var/www/html
    restart: always
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress

volumes:
  db_data

當我運行cd./wordpress && docker-compose up -d ，出現以下錯誤：

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

誰能告訴我我做錯了什么？

Answer 1

有一些錯字錯誤首先，像serivces ， evironment 。 他們應該拼出services和environment 。 同樣對於“...不是字符串”錯誤，只需在卷名后附加“：”，如下所示

volumes: db_data:

Answer 2

我剛才遇到了同樣的問題，關鍵是卷名的縮進，即 db_data。

我通過將卷名與上面示例中wordpress服務下的depends_on放在相同的縮進級別來修復它。 （點擊TAB）

volumes:
  mydata:

對比

volumes:
    mydata:

Answer 3

這會解決它，它對我有用

volumes:
  db_data:
    driver: local

Answer 4

version: '3.3'

serivces:
  db:
    image: mysql:5.7
    command: bash -c "mkdir -p /var/lib/mysql/"
    volumes:
      - db_data:/var/lib/mysql/
    restart: always
    evironment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress

  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    ports:
      - "8000:80"
    volumes:
      - ./:/var/www/html
    restart: always
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress

volumes:
  db_data: {}

save as docker-compose.yml
    cd wordpress
    docker-compose up