[CentOS] Apache won't start, semaphores exhausted
sudoyang at gmail.com
Wed Oct 5 16:21:14 UTC 2005
On 10/4/05, Aleksandar Milivojevic <alex at milivojevic.org> wrote:
> Fong Vang wrote:
> > (or why the system does not release the semaphore if Apache
> > is no longer running).
> Because IPC resources (semaphores, message queues and shared memory
> segments) are not tied to a process, an process simply has access to
> them (and can request for resource to be created or destroyed). It is
> perfectly OK for a process to create any IPC resource, exit, and then
> some other process started at a later time to pick it up. If something
> is allocating IPC resources and not cleaning up behind itself, than it
> is a bug in application (where application != process). IPCs are
> outside of that nice box called process, so you should think outside of
> the box too.
Makes sense. So looks like there's a semaphore leak. The owner of
the semaphore is the "apache" user. Is this most likely Apache or
could it be something else?
Is there a way to have the system automatically cleanup?
thanks for the help.
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