mysql is dead but subsys locked

问题

I am using PHP-mysql on Linux (RHEL 5.0) For First Time
When I tried to connect to MySQL from my PHP Script using mysqli_connect.
It Displayed The Following Error:

Can't connect to local MySQL server through socket '/var/mysql/mysql.sock'(2)

After googling for hour I found solution to this as stated here.

When I followed that approach and issued command:

service mysqld status

as a root user I got : mysql is dead but subsys locked Any one know how to solve this and cause of this error ?

Also

Restarting
Starting
And Stopping of MySQL

is Giving Output as: FAILED
But PHP is working fine. I've tested the phpinfo(); for Demo.
I've installed MySQL in /usr/local/mysql/bin. Can Anyone Help me in this ? Any help is appreciated.

Thanks in advance.

回答1:

I had this problem with my OTRS server after I tried to update a to large package.

The solution was:

copy for safty:

cp /var/lock/subsys/mysqld /root/mysqld

than delete it

rm /var/lock/subsys/mysqld

than close all services that depends on mysql:

service httpd stop
service otrs stop

after that:

service mysqld restart
service httpd restart
service otrs restart

System is CentOS 6.x

回答2:

tail /var/log/mysqld.log to check the error log
then do the following actions:

rm /var/lock/subsys/mysqld chown -R mysql.mysql /var/run/mysqld

回答3:

service mysqld restart

Simply restarting the mysqld worked fro me on Centos.

回答4:

first,make sure that /etc/init.d/mysqld is running from /usr/local/mysql/bin then,kill mysqld ,delete the lock file and restart it.

回答5:

This (and all sorts of other weird errors) can also happen if you have a full disk. In my case, my /var partition had filled up. Freeing up space allowed mysqld to restart again.

回答6:

First find the PID number of mysqld:

1. Use top | grep mysqld
2. kill -9 PID

Safe method, works fine with Cent OS

回答7:

Rebooting the server worked for me. Please remember to start all the services once you reboot in case you haven't added 'chkconfig' for them, lets say httpd, named and mysql.

回答8:

i use command kill, step by step:

use command service mysqld status for find PID mysqld
kill -9 PID
use command service mysqld status again for find PID mysqld
kill -15 PID
check again with command service mysqld status , check until the PID dead OR subsys locked
use command service mysqld start

来源：https://stackoverflow.com/questions/19358194/mysql-is-dead-but-subsys-locked

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