Drupal 8未连接到Docker中的Mysql

durpal 8的目录结构：

.
├── docker-compose.yml
├── dump
│   └── drupal.sql
├── sessions
└── www
    └── core
    └── site
    └── modules
    └── vendor
    └── index.php

My settings.php数据库配置

$databases['default']['default'] = array (
'database' => 'drupal',
'username' => 'root',
'password' => 'test',
'prefix' => '',
'host' => '127.0.0.1',
'port' => '3306',
'namespace' => 'Drupal\\Core\\Database\\Driver\\mysql',
'driver' => 'mysql',
);

我的docker-compose.yml代码

version: "2"
services:
www:
    image: drupal:8
    ports: 
        - "8001:80"
    volumes:
        - ./www:/var/www/html/
    depends_on:
        - db
    networks:
        - default
db:
    image: mysql:latest
    command: --default-authentication-plugin=mysql_native_password
    ports: 
        - "3306:3306"
    environment:
        MYSQL_DATABASE: drupal
        MYSQL_USER: user
        MYSQL_PASSWORD: test
        MYSQL_ROOT_PASSWORD: test
    volumes:
        - ./dump:/docker-entrypoint-initdb.d
        - /var/lib/mysql
    networks:
        - default
phpmyadmin:
    image: phpmyadmin/phpmyadmin
    links: 
        - db:db
    ports:
        - 8000:80
    environment:
        PMA_HOST: db
        MYSQL_USER: user
        MYSQL_PASSWORD: test
        MYSQL_ROOT_PASSWORD: test

使用上面的代码，我能够将phpmyadmin连接到mysql，并且工作正常，但是我无法将Drupal连接到mysql，并且出现以下错误：

PDOException:79#0/var/www/html/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php第79行的/var/www/html/core/lib/Drupal/core/Database/Driver/mysql/Connection.php（420）：PDO->u构造（'mysql:host=127..，'root'，'test Array）\n#1/var/www/html/core/lib/Drupal/core/Database/Database.php（371）：Drupal\core\Database\Driver\mysql\Connection:：open（Array）\n#2/var/www/html/core/lib/Drupal/core/Database/Database.php（166）：Drupal\core\Database\Database:：openConnection（'default'，'）\n#3[内部函数]：Drupal\core\Database\Database\Database:：getConnection（'default'））\n#4/var/www/html/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php（79）：调用用户函数数组（'Drupal\\core\\Dat…'，数组）\n#5/var/www/html/core/lib/Drupal/Component/DependencyInjection/Container.php（171）：Drupal\Component\DependencyInjection\PhpArrayContainer->createService（数组，'database'）\n#6/var/www/html/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php（260）：Drupal\Component\DependencyInjection\Container->get（'database'，1）\n#7/var/www/html/core/lib/Drupal/Component/DependencyInjection/PhpArrayContainer.php（62）：Drupal\Component\DependencyInjection\PhpArrayContainer->resolvservices和parameters（数组）\n#8/var/www/html/core/lib/Drupal/Component/DependencyInjection/Container.php（171）：Drupal\Component\DependencyInjection\PhpArrayContainer->createService（数组，'cache.Container'）\n#9/var/www/html/core/lib/Drupal/core/Drupal/core/DrupalKernel.php（515）：Drupal\Component\DependencyInjection\Container->->->获取（'cache.Container\n#10/var/www/html/core/lib/Drupal/core/DrupalKernel.php（876）：Drupal\core\DrupalKernel->getCachedContainerDefinition（）\n#11/var/www/html/core/lib/Drupal/core/DrupalKernel.php（468）：Drupal\core\DrupalKernel\DrupalKernel->initializeContainer（）\n#12/var/www/html/core/lib/Drupal/DrupalKernel/core->boot（））\n#13/var/www/html/index.php（19）：Drupal\Core\DrupalKernel->handle（对象（Symfony\Component\HttpFoundation\Request））\n#14{main}

---

我想您应该将数据库连接指向在docker compose文件中创建的主机名。注册时不能是本地主机地址：

$databases['default']['default'] = array (
'database' => 'drupal',
'username' => 'root',
'password' => 'test',
'prefix' => '',
'host' => 'db', #here you point to the container's service name
'port' => '3306', 
'namespace' => 'Drupal\\Core\\Database\\Driver\\mysql',
'driver' => 'mysql',
);

---

替换loca ip地址

'host' => '127.0.0.1',

按服务docker名称

'host' => 'db',

---

谢谢Danieland，我尝试了所有其他方法，但一次就成功了。如果我没有在docker compose文件中定义

phpmyadmin:

部分，情况会怎样。我也面临同样的问题，如果我没有在docker compose文件中定义phpmyadmin:节，情况会怎样。我也面临同样的问题