Can't connect to local MySQL server through socket '/tmp/mysql.sock'

 If you see this error message while trying to connect to a local MySQL Server:

ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'

It means either the MySQL server is not installed/running, or the file mysql.sock doesn’t exist in /var/lib/mysql/.

There are a couple of solutions for this error. 

On your command prompt or terminal try to stop the server first by running below command

Mysql.server stop

And after successfully stopped

Run below command to start the mysql server

Mysql.server start