[root@centos var]# service mysqld stop
MySQLmanager or server PID file could not be found! [FAILED]
解决办法：
首先查看一下进程
[root@irxpert-test /]# ps aux |grep mysq*
root 10274 0.0 0.0 68160 1336? S 13:43 0:00 /bin/sh/usr/bin/mysqld_safe --datadir=/var/lib/mysql--pid-file=/var/lib/mysql/irxpert-test.pid
mysql 10353 0.0 1.0 344360 39464? Sl 13:43 0:00 /usr/sbin/mysqld--basedir=/usr --datadir=/var/lib/mysql--plugin-dir=/usr/lib64/mysql/plugin --user=mysql--log-error=/var/lib/mysql/irxpert-test.err--pid-file=/var/lib/mysql/irxpert-test.pid
root 11884 0.0 0.0 63384 760pts/1 S+ 15:44 0:00 grep mysq*
如果看到上面的内容，那说明，Mysql的进程卡死了，这时用就要把这些卡死的进程都关闭
[root@centos mysql]# kill 10274
[root@centos mysql]# kill 10353
启动Mysql就ok了
[root@centos mysql]# service mysql start
Starting MySQL. [ OK ]
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