Nagios defunct processes

[Mark Frasa]

On 2007.01.19 10:58:25 -0600, Marc Powell wrote:
> 
> 
> > -----Original Message-----
> > From: nagios-users-bounces at lists.sourceforge.net [mailto:nagios-users-
> > bounces at lists.sourceforge.net] On Behalf Of Mark Frasa
> > Sent: Friday, January 19, 2007 10:21 AM
> > To: nagios-users at lists.sourceforge.net
> > Subject: Re: [Nagios-users] Nagios defunct processes
> > 
> > On Fri, 19 Jan 2007 10:05:51 -0600
> > "Marc Powell" <marc at ena.com> wrote:
> > 
> > >
> 
> [chop]
> 
> > > And do your defunct processes go away after 10 seconds?
> > >
> > > --
> > > Marc
> > 
> > Hello,
> > 
> > The little ones i pasted go away even faster, but you are orientating
> on
> > the wrong part of my question :)
> > The real problem is that this process:
> > 
> > nagios   14417  2593  0 Jan16 ?        00:00:00 [nagios <defunct>]
> 
> I'm not necessarily on the wrong track but admittedly this is a grey
> area for me. Others on the list (Andreas Ericsson for example) have a
> better understanding of the internals of this process than I. My
> understanding is that nagios forks child/grandchild process for each
> service check that it executes and sends results up via IPC pipe.
> 
>    [nagios parent] (fork)-> [nagios child] (fork)-> [nagios grandchild]
> (fork)-> [plugin]
> 
> A defunct process is one in which the parent has not yet released the
> child process. Logically, the nagios grandchild will release the plugin
> after it executes and then the child will release the grandchild after
> processing its results on up to the top so something would appear to be
> preventing that release.
> 
> > The real problem is that this process:
> > 
> > nagios   14417  2593  0 Jan16 ?        00:00:00 [nagios <defunct>]
> > 
> > Will last there until we kill -HUP kill -9 and restart nagios.
> > And while this process stays defunct nagios is acting like there are
> two
> > instances running.
> 
> This is a child process of parent 2593. Is 2593 your master nagios
> daemon? In the end the grandchild should be owned by init, not nagios. I
> am presuming that you've stopped nagios and have verified that you
> really don't have multiple master processes running. What OS and nagios
> version are you seeing this on?
> 
> --
> Marc

Hello,

The versions:

Red Hat Enterprise Linux ES release 3 (Taroon Update 8)

Nagios 2.5
Copyright (c) 1999-2006 Ethan Galstad (http://www.nagios.org)
Last Modified: 07-13-2006


Cheers,
Mark
> 
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