No space left on device: AH00023: Couldn't create the mpm-accept mutex

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 No space left on device: AH00023: Couldn't create the mpm-accept mutex

The issue is caused due to Apache running out of Semaphores. 

Semaphores are used for communicating between the active processes of a certain application. In the case of Apache, 

Semaphores are used to communicate between the parent and child processes. 

Generally, Apache cleans up these things itself, but sometimes it can’t due to some semaphores getting stuck. 

Then it can’t communicate properly with the newly started processes. Hence, the Apache/HTTPD goes down.
 
To resolve this issue,
 
run below command
 
ipcs -s | awk -v user=apache '$3==user {system("ipcrm -s "$2)}'

Once done, you need to run apache/httpd restart. 

The issue will be resolved.

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