mysql.server startで"mysqladmin: connect to server at 'localhost' failed"と出たので.
$ mysql.server start
> mysqladmin: connect to server at 'localhost' failed
> error: 'Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)'
> Check that mysqld is running and that the socket: '/tmp/mysql.sock' exists!
$ vi ~/.my.cnf
$ mysql.server start
> Starting MySQL
> . SUCCESS!