Discuz! info: Can not connect to MySQL server

Time: 2018-10-21 4:29am
Script: /kebmotickets-recent-endeavors-further-ignite-career-of-kebmo-t166716.html

Error: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (11)
Errno.: 2002

Similar error report has beed dispatched to administrator before.