[CentOS] Apache won't start, semaphores exhausted

Wed Oct 5 00:50:25 UTC 2005
Craig White <craigwhite at azapple.com>

On Tue, 2005-10-04 at 17:45 -0700, Fong Vang wrote:
> One of our systems run Apache 2.0.52 (httpd-2.0.52-12.2.ent.centos4
> rpm).  The kernel we're running is 2.6.9-11.ELsmp.  After a few weeks
> of uptime, Apache refuses to start with the following error in
> error.log:
> 
>     [crit] (28)No space left on device: mod_jk: could not create jk_log_lock
> 
> With Apache not running, there're a lot of semaphores left behind by
> Apache, e.g.:
> 
> ------ Semaphore Arrays --------
> key        semid      owner      perms      nsems
> 0x00000000 98304      root      600        1
> 0x00000000 131073     apache    600        1
> 0x00000000 163842     apache    600        1
> 0x00000000 196611     apache    600        1
> 0x00000000 229380     apache    600        1
> 0x00000000 786437     root      600        1
> ...
> ...
> ...
> /proc/sys/kernel/sem has the following settings:
>     250     32000   32      128
> 
> Is this an Apache issue or is this a kernel issue?  Why is Apache not
> releasing the semaphores?
----
my guess is that you are out of space on partition containing /var

try command line...

df -h

see what 'No space on device' actually means

Craig


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