Apache failed to start with the “No space left on device” error.
If you receive the following error while restarting Apache in the server, you need to do the following steps.
These errors means that there is no available IPC (inter-process communication) resources in the system, such as semaphores or shared memory segments. You need to check IPC resources which are used in the server using ‘ipcs’ command:
$ ipcs -a
…
—— Semaphore Arrays ——–
key semid owner perms nsems
0×00000000 201293824 apache 600 1
…
—— Semaphore Arrays ——–
key semid owner perms nsems
0×00000000 201293824 apache 600 1
You will be able to see a lot of semaphores under Apache . You need to kill those processes using the following script and restart apache.
$ ipcs -s | grep apache | perl -e ‘while (<STDIN>) {@a=split(/\s+/); print `ipcrm sem $a[1]`}’
$ service httpd restart
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