* mysql启动报错时

        重启时    /etc/init.d/mysqld restart

                 Stopping mysqld:                                           [  OK  ]

                 Another MySQL daemon already running with the same unix socket.

                 Starting mysqld:                                           [FAILED]

        删除文件  rm -fr /var/lib/mysql/mysql.sock

        重启mysql /etc/init.d/mysqld restart

                 Stopping mysqld:                                           [  OK  ]

                 Starting mysqld:                                           [  OK  ]