connection to dat Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

[root@t1 ~]# tail /tmp/zabbix_server.log 
 23392:20160303:131022.598 [Z3001] connection to database 'zabbix' failed: [2002] Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) 23