Article ID: 117872, created on Oct 10, 2013, last review on Mar 31, 2016

  • Applies to:
  • Operations Automation
  • Plesk
  • Pro Control Panel


Apache cannot be started:

[root@store conf]# service httpd start
Starting httpd :                                       [Failed]

The following error can be found in the Apache error log file (/var/log/httpd/error_log):

[Mon Oct 07 18:20:01 2013] [error] (28)No space left on device: Cannot create SSLMutex


Those errors means that there is a lack of inner-process communication resources in the system, such as semaphores or shared memory segments:

[root@store conf]# ipcs -us

------ Semaphore Status --------
used arrays = 126
allocated semaphores = 130


  1. Increase the limits in "/etc/sysctl.conf":

    kernel.msgmni = 1024
    kernel.sem = 250 256000 32 1024
  2. Load the new sysctl settings from "/etc/sysctl.conf"

    [root@store conf]# sysctl -p

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