docker-compose环境，docker重启后网站数据库连接出错

报错信息：

SQLSTATE[HY000] [1045] Access denied for user 'mysql'@'172.18.0.3' (using password: YES)
Typecho_Db_Adapter_Exception: SQLSTATE[HY000] [1045] Access denied for user 'mysql'@'172.18.0.3' (using password: YES) in /app/var/Typecho/Db/Adapter/Pdo.php:60
Stack trace:
#0 /app/var/Typecho/Db.php(199): Typecho_Db_Adapter_Pdo->connect(Object(Typecho_Config))
#1 /app/var/Typecho/Db.php(350): Typecho_Db->selectDb(1)
#2 /app/var/Typecho/Db.php(384): Typecho_Db->query(Object(Typecho_Db_Query), 1)
#3 /app/var/Widget/Options.php(358): Typecho_Db->fetchAll(Object(Typecho_Db_Query), Array)
#4 /app/var/Typecho/Widget.php(221): Widget_Options->execute()
#5 /app/var/Widget/Init.php(27): Typecho_Widget::widget('Widget_Options')
#6 /app/var/Typecho/Widget.php(221): Widget_Init->execute()
#7 /app/index.php(17): Typecho_Widget::widget('Widget_Init')
#8 {main}

docker-compose.yml：

version: '2'
services:
  nginx:
    image: nginx:1.13.9-alpine
    container_name: blog_nginx
    ports:
      - "80:80"
    restart: always
    volumes:
      - ./typecho:/app
      - ./typecho.conf:/etc/nginx/conf.d/default.conf
      - ./logs:/var/log/nginx
    links:
      - php-fpm
    depends_on:
      - php-fpm

  php-fpm:
    image: anguiao/php-fpm
   container_name: blog_fpm
    expose:
      - 9000
    volumes:
      - ./typecho:/app
    restart: always
    links:
      - mysql
    depends_on:
      - mysql
  mysql:
    image: mysql:5.7
    container_name: blog_db
    expose:
      - 3306
    volumes:
      - ./mysql:/var/lib/mysql/:rw
      - ./logs:/var/logs/mysql
    restart: always
    environment:
      - MYSQL_ROOT_PASSWORD=123456
      - MYSQL_DATABASE=typecho
      - MYSQL_USER=typecho
      - MYSQL_PASSWORD=123456

• 数据库版本：5.7
• PHP 版本：7.3

Start with docker-compose.yml and the reported connection path in var/Typecho/Db/Adapter/Pdo.php, then reproduce the failure after restarting Docker. Check whether the configured MySQL credentials and persisted database state still permit the application connection; done means the site starts and connects to its database successfully after a restart.