[CentOS] Apache won't start, semaphores exhausted
sudoyang at gmail.com
Wed Oct 5 01:05:50 UTC 2005
On 10/4/05, Craig White <craigwhite at azapple.com> wrote:
> 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
Space is not the issue. That's the first thing I checked. It's
definitely because the system ran out of semaphores. After I cleared
out the semaphores belonging to Apache, it started again.
I need to understand why Apache is not releasing the semaphores on
shutdown (or why the system does not release the semaphore if Apache
is no longer running).
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