On-demand host checks and performance issues..

[Thomas Guyot-Sionnest]

Thanks for the fast answer. Indeed this seems great; I can't wait for 3.0
now.. :)

Hey BTW any chance you take a look at my OCHP/OCSP daemon thingy? I know you
asked for a howto with a crontab script but I really think my daemon has
huge advantages (I also often experienced problems feeding Nagios with lots
of checks at the same time)... I can write the Howto that goes with it in
whichever language you want (SGML I guess?) and will test it on a real
master/slave setup (though it was well tested in every technical aspects,
like keeping all its polled pipes full for some time and then testing
integrity and ordering (per pipe) of the data piped to send_nsca)...

Thomas Guyot-Sionnest
UNIX Systems Administrator
Zango
E: thomas at zango.com
P: 514.787.4714 |  F: 514.787.4707

www.zango.com
Read our blog at http://blog.zango.com 

> -----Original Message-----
> From: nagios-devel-bounces at lists.sourceforge.net 
> [mailto:nagios-devel-bounces at lists.sourceforge.net] On Behalf 
> Of Ethan Galstad
> Sent: March 5, 2007 11:34
> To: Nagios Developers List
> Subject: Re: [Nagios-devel] On-demand host checks and 
> performance issues..
> 
> The host check logic in Nagios 2.x and earlier is not optimal.  I 
> rewrote the entire host check logic for Nagios 3 and I've seen a 
> significant improvement in performance in my testing.
> 
> - Scheduled host checks are now run in parallel
> - On-demand host checks can now be skipped if the cached host check 
> logic kicks in
> 
> You can see what's new in Nagios 3 by looking at the latest CVS docs:
> 
> http://nagios.cvs.sourceforge.net/*checkout*/nagios/nagios/htm
> l/docs/whatsnew.html
> 
> 
> Thomas Guyot-Sionnest wrote:
> > Hi list,
> > 
> > While building a Nagios server I noted that as soon as I 
> have a few hosts
> > going down, Nagios starts lagging behind and missing some 
> checks. Even with
> > the check timeout set to 1 second I still get some 
> problems. My current
> > workaround is to disable active checks on hosts that are 
> down and this could
> > be done automatically with a service check and event handler.
> > 
> > Part of the problem seems to be caused by the fact that 
> Nagios check the
> > host on every service failure (and recovery?). I think it 
> wouldn't be hard
> > to add a max_check_frequency parameter for hosts so that 
> they wouldn't be
> > check more often than a defined interval.
> > 
> > What do you think about this idea? It could solve most 
> performance problems
> > related with on-demand host checks. Is there any change I 
> could see this at
> > least for Nagios 3.0 (AFAIK parallelizing is only done on 
> scheduled hosts
> > checks in 3.0)... Even better would be using multiple 
> threads for  reaping
> > service check but I have no idea if that's technically 
> possible and/or how
> > hard it would be...
> > 
> > Thanks,
> > 
> > Thomas
> > 
> 
> 
> 
> Ethan Galstad,
> Nagios Developer
> ---
> Email: nagios at nagios.org
> Website: http://www.nagios.org
> 
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