Starting MySQL. ERROR! The server quit without updating PID file (/var/lib/mysql/localhost.localdo

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问题：

[root@localhost ~]# /etc/init.d/mysqld start
Starting MySQL... ERROR! The server quit without updating PID file (/var/lib/mysql/localhost.localdomain.pid).

解决方法：

[root@localhost ~]# mv /etc/my.cnf /etc/my.cnf.bak
[root@localhost ~]# /etc/init.d/mysqld restart