MySQLmanager or server PID file could not be found!

[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?                  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.             

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