sonyboy.dk » semaphore http://www.sonyboy.dk Tools, tip, tricks and other stuff I might come up with Sat, 04 Sep 2010 19:41:25 +0000 en hourly 1 http://wordpress.org/?v=3.1.3 Apache2 – No space left on device http://www.sonyboy.dk/2009/07/22/apache-no-space-left-on-device/ http://www.sonyboy.dk/2009/07/22/apache-no-space-left-on-device/#comments Wed, 22 Jul 2009 07:32:59 +0000 Sonyboy http://www.sonyboy.dk/?p=34 I had problems restarting Apache2… After researching a lot I found that it was due there were myriads of semaphore-arrays left, owned by my www-data user.

The following appears to be some of the errors Apache writes in the log.

  • [emerg] (28)No space left on device: Couldn’t create accept lock

    or

  • [crit] (28)No space left on device: mod_rewrite: could not create rewrite_log_lock Configuration Failed

    or

  • [error] (28)No space left on device: Cannot create SSLMutex

After stopping Apache I found the semaphores with the following command

ipcs -s | grep www-data

Removing this semaphores immediately solved the problem.

ipcs -s | grep www-data | perl -e ‘while (<STDIN>) { @a=split(/\s+/); print `ipcrm sem $a[1]`}’
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