Perl DBI MySQL エラー Can't connect to local MySQL server through socket '/tmp/mysql.sock'

DBI connect *** failed: Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) at ***
Got error Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) when connecting to DBI:***

参考
http://diary.lampetty.net/20060926.html
mysql_socketというオプションを指定