经过测试的：

services:
   db_wp:
     image: mariadb:latest
     volumes:
       - ./db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: xxxxx
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress-yh
       MYSQL_PASSWORD: xxxxx
   wordpress:
     depends_on:
       - db_wp
     image: wordpress:latest
     ports:
       - "3002:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db_wp:3306
       WORDPRESS_DB_USER: wordpress-yh
       WORDPRESS_DB_PASSWORD: xxxxx
       WORDPRESS_DB_NAME: wordpress
     volumes:
       - ./wordpress:/var/www/html