错误建立数据库连接 docker compose

Question

我正在尝试使用docker 设置wordpress。我在下面包含了我的 yaml 文件。在这里，我将 mariadb_database 设置为 db_tyre。

当我点击docker-compose up -d 时，它正在创建所有需要的wordpress 文件。这也在创建 db_tyre 数据库，但是当我尝试 localhost:8000 时，它给了我Error establishing a database connection。

我检查了 wp-config.php 文件，它有以下几行。

define( 'DB_NAME', 'wordpress');

/** MySQL database username */
define( 'DB_USER', 'wordpress');

/** MySQL database password */
define( 'DB_PASSWORD', 'wordpress');

/** MySQL hostname */
define( 'DB_HOST', 'mariadb:3306');

yml 文件

version: '3'

services:
  # Database
  db:
    image: bitnami/mariadb:latest
    volumes:
      - db_data:/var/lib/mysql
    restart: always
    environment:
      MARIADB_ROOT_PASSWORD: password
      MARIADB_DATABASE: db_tyre
      MARIADB_USER: wordpress
      MARIADB_PASSWORD: wordpress
    networks:
      - wpsite
  # Wordpress
  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    ports:
      - '8000:80'
    restart: always
    volumes: ['./:/var/www/html']
    environment:
      WORDPRESS_DB_HOST: mariadb:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
    networks:
      - wpsite
  # phpmyadmin
  phpmyadmin:
    depends_on:
      - db
    image: phpmyadmin/phpmyadmin
    restart: always
    ports:
      - '8080:80'
    environment:
      PMA_HOST: db
      MYSQL_ROOT_PASSWORD: password 
    networks:
      - wpsite
networks:
  wpsite:
volumes:
  db_data:

Answer 1

正如评论中提到的，您应该设置更新HOST，但它仍然不起作用，因为 WordPress 数据库配置似乎不正确。

DB 的 ENV 是

      MARIADB_ROOT_PASSWORD: password
      MARIADB_DATABASE: db_tyre
      MARIADB_USER: wordpress
      MARIADB_PASSWORD: wordpress

所以应该更新 WordPress 数据库配置，它应该是 db_tyre

define( 'DB_NAME', 'db_tyre');

/** MySQL database username */
define( 'DB_USER', 'wordpress');

/** MySQL database password */
define( 'DB_PASSWORD', 'wordpress');

/** MySQL hostname */
define( 'DB_HOST', 'db:3306');

或者可以试试官方图片

version: '3.1'

services:

  wordpress:
    image: wordpress
    restart: always
    ports:
      - 8080:80
    environment:
      WORDPRESS_DB_HOST: db
      WORDPRESS_DB_USER: exampleuser
      WORDPRESS_DB_PASSWORD: examplepass
      WORDPRESS_DB_NAME: exampledb
    volumes:
      - wordpress:/var/www/html

  db:
    image: mysql:5.7
    restart: always
    environment:
      MYSQL_DATABASE: exampledb
      MYSQL_USER: exampleuser
      MYSQL_PASSWORD: examplepass
      MYSQL_RANDOM_ROOT_PASSWORD: '1'
    volumes:
      - db:/var/lib/mysql

volumes:
  wordpress:
  db: