Discuz! info: Can not connect to MySQL server

Time: 2018-10-20 5:00am
Script: /the-best-value-holiday-destinations-skyscanner-reveals-the-holes-in-our-preconceptions-t1285369.html

Error: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
Errno.: 2002

Similar error report has beed dispatched to administrator before.