The following problem in MySQL for Mac:
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/tmp/mysql.sock’ (2)
It’s solved by doing:
$ sudo chown -R _mysql /usr/local/var/mysql
$ sudo chmod -R o+rwx /usr/local/var/mysql
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/tmp/mysql.sock’ (2)
EN 
ES