Discuz! info: Can not connect to MySQL server

Time: 2018-10-21 4:29am
Script: /hertz-car-rental-what-people-like-about-hertz-car-rental-t648.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.