我创建了一个小工具docker-compose.yml，过去它像一个魅力一样可以部署小型WordPress实例。看起来像这样：

wordpress:
  image: wordpress:latest
  links:
   - mysql
  ports:
   - "1234:80"
  environment:
    WORDPRESS_DB_USER: wordpress
    WORDPRESS_DB_NAME: wordpress
    WORDPRESS_DB_PASSWORD: "password"
    WORDPRESS_DB_HOST: mariadb
    MYSQL_PORT_3306_TCP: 3306
  volumes:
    - /srv/wordpress/:/var/www/html/
mysql:
  image: mariadb:latest
  mem_limit: 256m
  container_name: mariadb
  environment:
    MYSQL_ROOT_PASSWORD: "password"
    MYSQL_DATABASE: wordpress
    MYSQL_USER: wordpress
    MYSQL_PASSWORD: "password"
  volumes:
    - /srv/mariadb:/var/lib/mysql

但是当我现在启动它时（也许是因为docker更新到Docker 1.9.1版本，build a34a1d5），它失败了

wordpress_1 | Warning: mysqli::mysqli(): (HY000/2002): Connection    refused in - on line 10
wordpress_1 | 
wordpress_1 | MySQL Connection Error: (2002) Connection refused

当我的猫/etc/hosts的wordpress_1有项针对MySQL：

172.17.0.10 mysql 12a564fdbc56 mariadb

而且我能够ping通MariaDB服务器。

当我docker-compose up安装WordPress并多次重启后，MariaDB容器打印出来：

Version: '10.0.22-MariaDB-1~jessie'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  mariadb.org binary distribution

是哪个指示它正在运行，不是吗？

我如何获得WordPress才能连接到MariaDB容器？