[求助] ERROR! MySQL server PID file could not be found! 这个怎么处理？

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[root@localhost /]# service mysqld restart
ERROR! MySQL server PID file could not be found!
Starting MySQL.Logging to '/www/wdlinux/mysql/var/localhost.localdomain.err'.
ERROR! The server quit without updating PID file (/www/wdlinux/mysql/var/localhost.localdomain.pid).
[root@localhost /]# service mysqld start
Starting MySQL.Logging to '/www/wdlinux/mysql/var/localhost.localdomain.err'.
ERROR! The server quit without updating PID file (/www/wdlinux/mysql/var/localhost.localdomain.pid).
[root@localhost /]# service mysqld stop
ERROR! MySQL server PID file could not be found!