ERROR! MySQL is not running, but lock exists : MySQL ERROR

MySQL is not running on the server. when I try to connect to MySQL I get the following error :-

root@server [~]# mysql
ERROR 2002 (HY000): Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)
root@server [~]# /etc/init.d/mysql status
ERROR! MySQL is not running, but lock exists
root@server [~]#

When checked with the MySQL service I got this error

root@server [~]# /etc/init.d/mysql status

ERROR! MySQL is not running, but lock exists

Here are the steps that should fix the issue.

root@server [~]# rm /var/lock/subsys/mysql
rm: remove regular empty file `/var/lock/subsys/mysql’? y

root@server [~]# /etc/init.d/mysql start

If still it doesn't solve the issue, The best possibility is that the mysql PID file was left after the system restart and I assume that mysql server was not stopped properly.

So please check mysql by following command

root@server [~]# top |grep mysql

OR

root@server [~]# ps aufx | grep mysql

If it shows the mysql process, Kill that mysql process and again run the command :-

root@server [~]# rm /var/lock/subsys/mysql

and start the mysql service by

root@server [~]# /etc/init.d/mysql start

This should resolve the issue

Note : There could be some chances that your disk usage 100% full.

root@server [~]# df -h

If that one is usr, var or tmp then you can remove old logs.

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