[error] (28)No space left on device: Cannot create SSLMutex Apache Solution Linux CentOS Ubuntu Debian Mint

Have you got this error from Apache?

[notice] suEXEC mechanism enabled (wrapper: /usr/sbin/suexec)
[error] (28)No space left on device: Cannot create SSLMutex

At first glance it appears that you may be out of disk space but the issue is ipc or interprocess communication.

This will clear out the ipcs processes so things can work, this often happens during high traffic and may be a sign of DDOS.

The command below will fix it, it will list all of the ipcs processes that belong to your apache user (change the part in bold to whatever apache runs as) and then

ipcs -s | grep YOURAPACHEuser | awk '{ print $2 }' | xargs -n 1 ipcrm -s

The above should fix it, but if you're curious here is the raw output of ipcs -s on a random VM.

------ Semaphore Arrays --------
key        semid      owner      perms      nsems     
0x00000000 0          root       600        1         
0x00000000 65537      root       600        1         
0x00000000 1081346    apache     600        1         
0x00000000 1114115    apache     600        1  

That's why we do awk on the second column to get the semid, and then we pipe to xargs which then uses the ipcrm -s command to remove all of the semid's that we found.


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