Hosts with no services?

[Mooney, Ryan]

So create a passive "fping" service for those hosts and wrap a script around fping to pipe the output into nagios.
Nagios will then only spawn off its own ping check when your "service" ping fails.  Not perfect, but until passive
host checks in 2.x it works pretty good...

-----Original Message-----
From: John Senior [mailto:js at irishbroadband.ie]
Sent: Thursday, June 26, 2003 5:16 AM
To: nagios-users at lists.sourceforge.net
Subject: RE: [Nagios-users] Hosts with no services?



I disagree - I have many many devices on my network that I just need to 
know are alive with a ping - these devices just provide connectivity, things 
like switches, customer routers etc.  A simple ping is all that's required, 
no more.  I have plenty of hosts with more complex services (web, mail, dns 
etc.) that Nagios fits fine - but sometimes a ping is enough.  I too am using 
fping to provide the kind of info that I would rather integrate into Nagios. 

Regards, 

John. 

-- 
John Senior <js at irishbroadband.ie> 

> -----Original Message----- 
> From: nagios-users-admin at lists.sourceforge.net 
> [ mailto:nagios-users-admin at lists.sourceforge.net]On Behalf Of Dr. Dave 
> Blunt 
> Sent: 26 June 2003 04:54 
> To: 'Carroll, Jim P [Contractor]'; 'Furnish, Trever G' 
> Cc: 'Nagios-Users List (E-mail)' 
> Subject: RE: [Nagios-users] Hosts with no services? 
> 
> 
> Hi, 
> 
> I think I agree with Jim.  I guess I don't see why you would care if a 
> system was up if you didn't care about at least one service - unless 
> that 'service' is keeping the room warm.  Why not pull the power cord 
> now?  If you're not responsible for making sure the system is up or 
> tracking some metric about specific services then why even 
> configure it 
> in Nagios? 
> 
> $.02 
> 
> 
> Dr. Dave Blunt 
> Manager of Information Technology, Virage, Inc. 
> 411 Borel Ave., Suite 100S 
> San Mateo, CA 94402 
> 
> -----Original Message----- 
> From: nagios-users-admin at lists.sourceforge.net 
> [ mailto:nagios-users-admin at lists.sourceforge.net] On Behalf 
> Of Carroll, 
> Jim P [Contractor] 
> Sent: Wednesday, June 25, 2003 5:54 PM 
> To: Furnish, Trever G 
> Cc: Nagios-Users List (E-mail) 
> Subject: RE: [Nagios-users] Hosts with no services? 
> 
> 
> I suppose you could use check_dummy for your service check.  Caveat: 
> I've experienced hosts which are pingable but are otherwise 
> worthless/dead.  You've stated yourself that you need to know that the 
> box is alive.  So what constitutes 'alive'?  If I can ping a box but a 
> user cannot login to that box, is it still alive?  If I can't ping the 
> box but when I walk over to it, there are blinking lights and whirring 
> fans, is it still alive?  If the main HDD activity light is flickering 
> but bashing away on the console doesn't get me any response, 
> is it still 
> alive?  (These are purely rhetorical questions.) 
> 
> If you'd like to know within 5 minutes that a user cannot use service 
> XYZ, then configure Nagios to monitor the health of that service and 
> check on it frequently.  If you don't mind that a user cannot 
> login to a 
> host between 5pm and 9am, then configure Nagios to not bother checking 
> between those times (thus cutting down on 'unnecessary' CPU 
> and network 
> traffic). 
> 
> If you don't mind that your root filesystem is sitting at 99.99% 
> capacity, then don't bother with check_disk.  If you don't 
> mind the load 
> average hitting 20 frequently, then don't bother with check_load.  If 
> you don't mind that a HDD is starting to complain about bad 
> blocks, then 
> don't bother with check_log2. 
> 
> Yes, I'm playing devil's advocate here.  If after everything I've said 
> you still find keeping a finger on the pulse of the corporate 
> systems to 
> be uninteresting, then take another look at check_dummy, and 
> replace the 
> check_ping service with it.  (Bonus:  You'll cut down on 
> network traffic 
> and remote processing.  ;) 
> 
> jc 
> 
> 
> > -----Original Message----- 
> > From: Furnish, Trever G [ mailto:TGFurnish at herff-jones.com] 
> > Sent: Wednesday, June 25, 2003 2:16 PM 
> > To: Carroll, Jim P [Contractor] 
> > Cc: Nagios-Users List (E-mail) 
> > Subject: RE: [Nagios-users] Hosts with no services? 
> > 
> > 
> > But why should you monitor something you don't care about, 
> generating 
> > needless traffic and cpu overhead? 
> > 
> > I too do a ping in the host check and a redundant ping 
> > service check - but 
> > it's still a waste.  Sure there are other services on the 
> > box, but I don't 
> > need to monitor them -- all I need is to know the box is 
> > alive, in which 
> > case the extra ping is pointless and wastes resources. 
> > 
> > In a previous life I did this with a little shell script and 
> > fping.  You 
> > lose the benefit of being able to acknowledge individual 
> > hosts that way 
> > though.  Then again, if you allow your techs to log into the 
> > system doing 
> > fping, then adding a host a file listing those to ignore 
> becomes easy. 
> > 
> > -t. 
> 
> 
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