[error] (28)No space left on device: Cannot create SSLMutex Configuration Failed
The error indicates that system is running out of IPC (Inter-Process Communication) resources, such as semaphore arrays, message queues or shared memory segments.
Login to the system via SSH or console, and use the following command to check the status and information of IPC facilities.
$ ipcs
The output of the command looks like the following:
------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x01022bf8 4096000 root 600 1200712 111 ------ Semaphore Arrays -------- key semid owner perms nsems 0x00000000 0 root 600 1 0x00000000 32769 root 600 1 0x00000000 18186242 apache 600 1 0x00000000 18513923 apache 600 1 0x00000000 18841604 apache 600 1 0x00000000 19759109 apache 600 1 0x00000000 20086790 apache 600 1 0x00000000 20119559 apache 600 1 0x00000000 20152328 apache 600 1 0x00000000 19005449 root 600 1 0x00000000 20185098 apache 600 1 0x00000000 20217867 apache 600 1 ------ Message Queues -------- key msqid owner perms used-bytes messages
There should be a lot of semaphores used by Apache. To resolve the error, kill all those Apache processes by using the following command:
$ ipcs -s | grep apache | perl -e 'while (<STDIN>) {@a=split(/\s+/); print `ipcrm sem $a[1]`}'
Then, restart the Apache HTTPD web server service with the following command:
$ service httpd restart
Apache should now be started and running properly.