<HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1479" name=GENERATOR></HEAD> <BODY style="MARGIN: 4px 4px 1px; FONT: 12pt Tahoma">Thanks for the ideas. I'll look into the passive service check. I just have to convince the Citrix guys to let me install a client on them. >>> Demetri Mouratis <dmourati@cm.math.uiuc.edu> 2/18/2005 1:28:20 PM >>> <DIV style="COLOR: #000000">On Fri, 18 Feb 2005, Andreas Ericsson wrote: > Demetri Mouratis wrote: > > On Thu, 17 Feb 2005, Bill Akins wrote: > > > > > >>Hi folks, > >> > >>Running Nagios 2.0b1 on RHEL3 > >> > >>I have about 160 servers monitored with over 600 services monitored and > >>Nagios is working great. I do have a problem with a pool of Citrix > >>servers I monitor. Through Control-M, machines are rebooted at random > >>times (once no users are logged on and certain other conditions are met) > >>and then they are added back into the pool. > >> > >>My question is how can I turn off or delay alerting on unreachable for > >>5 minutes to accommodate the reboot? I want to know if the machine goes > >>away for more than 5 minutes. I am currently checking for several > >>services running on these machines as well as disk space and ping. > > > > > > Have your citrix servers send a passive service check to your Nagios box > > saying to deactivate service checks for that host. Then have you init > > script, or some such on your citrix box turn checks back on once it comes > > back up. > > > > This is a good idea, and not terribly cumbersome to implement. > > > That or increase your service check times or retries times to accommodate > > a 5 minute outage but not a 10 minute one. > > This won't work. Nagios will start checking host status upon soft > service states and do ALL host checks in serial until it gets a good > response or runs out of max_check_attempts, meaning this idea would > effectively DOS your nagios every time a machine reboots for > (hostobject)max_check_attempts * hostcheck_timeout seconds. You're right. I was thinking about my own environment where I fake host checks with check_dummy to avoid the problem you mention above. --------------------------------------------------------------------- Demetri Mouratis dmourati at linfactory.com ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. <A href="http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click">http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click</A> _______________________________________________ Nagios-users mailing list Nagios-users@lists.sourceforge.net <A href="https://lists.sourceforge.net/lists/listinfo/nagios-users">https://lists.sourceforge.net/lists/listinfo/nagios-users</A> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </DIV></BODY></HTML>