ERROR! MySQL is running but PID file could not be found ?

出现这个问题原因很多
最常见的通常是PID进程未全部关闭
比如启动safe mysqld进程后
未关闭

运行 /etc/init.d/mysql status
会提示
ERROR! MySQL is running but PID file could not be found

先打印MYSQL进程
ps aux | grep mysql

然后KILL进程
kill -9 pid1 pid2 …

在启动MYSQL
/etc/init.d/mysql start

在检查
/etc/init.d/mysql status
SUCCESS! MySQL running (10021)

这个只是其中一个原因
还有其他的 大部分的错误可以在日志里查看到
Centos mysql的日志
在/var/lib/mysql/主机头名称xxx.err

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