禅道登录页面空白

你好，服务器硬盘不够，将整个zbox压缩到新硬盘，启动禅道服务器，网页打开网站是空白页。
打开debug后，log提示：

20:35:07 ERROR: SQLSTATE[HY000] [2002] Connection refused in /home/smatek/4T_DISK/ZenTao/zbox/app/zentao/framework/base/router.class.php on line 2180, last called by /home/smatek/4T_DISK/ZenTao/zbox/app/zentao/framework/base/router.class.php on line 2129 through function connectByPDO.

in /home/smatek/4T_DISK/ZenTao/zbox/app/zentao/framework/base/router.class.php on line 2235 when visiting

服务器启动时，mysql能再次启动，应该是mysql启动后又退出了。
sudo ./zbox start
Apache is running
Start Mysql success
smatek@smatek:/opt/zbox$ sudo ./zbox start
Apache is running
Start Mysql success

麻烦帮忙瞧瞧~