禅道安装与部署问题已解决悬赏5积分

1，CentOS7按linux用一键安装包方式安装完成且系统一切OK，但重启服务器后报如下故障

Fatal error: Uncaught PDOException: SQLSTATE[HY000] [2002] Connection refused in /opt/zbox/app/zentao/lib/dbh/dbh.class.php:98 Stack trace: #0 /opt/zbox/app/zentao/lib/dbh/dbh.class.php(98): PDO->__construct('mysql:host=127....', 'root', '123456') #1 /opt/zbox/app/zentao/framework/base/router.class.php(3134): dbh->__construct(Object(stdClass), true, 'MASTER') #2 /opt/zbox/app/zentao/framework/base/router.class.php(3001): baseRouter->connectByPDO(Object(stdClass), 'MASTER') #3 /opt/zbox/app/zentao/framework/base/router.class.php(522): baseRouter->connectDB() #4 /opt/zbox/app/zentao/framework/base/router.class.php(576): baseRouter->__construct('pms', '/opt/zbox/app/z...', 'running') #5 /opt/zbox/app/zentao/www/index.php(33): baseRouter::createApp('pms', '/opt/zbox/app/z...', 'router') #6 {main} thrown in/opt/zbox/app/zentao/lib/dbh/dbh.class.php on line98

2，数据库默认在/opt目录下，存在root磁盘容量不够问题

basedir  = /opt/zbox/run/mysql

datadir  = /opt/zbox/data/mysql

tmpdir   = /opt/zbox/tmp/mysql

能否提供一下软连接的小白教程。