遇到的问题---mysql 启动错误-server PID file could not be found

[root@centos var]# service mysqld stop

MySQL manager 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/