"Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)") (Background on this error at: http://sqlalche.me/e/13/e3q8) code example

Example: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.s

> ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
> 
> service mysql start or service mysql start