Distributed Monitoring with passive Host checks

[Marc Powell]

Passive host checks are not supported at all until 2.0.

You're on the right track for a solution until it's supported natively
though.

marc

> -----Original Message-----
> From: Thomas Fischer [mailto:thomas.fischer at quadriga.com]
> Sent: Friday, August 01, 2003 9:51 AM
> To: Olaf Hoyer
> Cc: nagios-users at lists.sourceforge.net
> 
> Olaf,
> 
> cheers for your answer. Service checks are not the problem and run
> already. I need a passive host check ability. At the moment the
central
> server does active host checks, but due to the fact that the remote
site
> is not reachable from external sources the host checks fail. So i get
a
> display where the hosts are marked as critical while the services are
> marked as OK. I need a method to transmit (maybe via NSCA) the host
checks
> passively to the central server. Otherwise i have to write a new
plugin
> that allows above. However if that works with Nagios is a diff story.
I
> could for example write an event handler that takes the NSCA results,
> writes them into a status file (or Database) and the host check on the
> central server then extracts the info and flags the result
accordingly.
> 
> Tom
> 
> -----Original Message-----
> From: Olaf Hoyer [mailto:ohoyer at gaff.hhhr.ision.net]
> Sent: 01 August 2003 15:44
> To: Thomas Fischer
> Cc: nagios-users at lists.sourceforge.net
> Subject: Re: [Nagios-users] Distributed Monitoring with passive Host
> checks
> 
> 
> On Fri, 1 Aug 2003, Thomas Fischer wrote:
> 
> > Guys and Gals,
> >
> > following situation. We have multiple remote sites (currently over
400
> but expanding to over 2000 in the next 3 years) which use internally
> exactly the same adressing scheme. Don't ask why the same Addresses,
but
> be assured that i pointed already a 45 Magnum at the idiot who
designed
> this. Anyway back to the prob.
> >
> > I want to remotely monitor all hosts in every site (well not all
because
> that would already now mean about 100k hosts), but i don't have direct
> access at the moment into each site. Also i would need to include a
second
> Firewall to open a VPN tunnel to our HQ where the central server sits.
An
> additional Firewall would cost. I hear you all crying out already why
2
> Firewalls, but unfortunately the sites use PIX Firewalls which is a
piece
> of shi* and can't do split tunnels and NAT at the same time,
thankfully i
> will sooner or later be able to use a Nokia with CP FW-1 for each
site.
> >
> > How can i do passive host checks from the central server without
> spending loads of development time, loads of money and have loads of
> headaches? Anybody did that already? Ohhh and no i can't wait a
minimum of
> 12 months until Nagios 2.0 comes out.
> >
> > Any ideas, pointers etc. highly welcome. If anybody has an idea just
> contact me and i can pass more details on about the Network setup.
> >
> I also had the scenario in another setup.
> We had some management LANs in the company, where we needed to monitor
> some services, too.
> 
> I set up distributed monitoring via NSCA.
> 
> 
> works as follows:
> 
> In the remote LAN you set a dedicated box, which actively checks all
> services that are needed.
> The check-results are transmitted via a small script (available on
> nagios.org) via the nsca-demon to a central master nagios-server.
> 
> The nagios-Master identifies the checks that come in according to
their
> name, not due to ip.
> 
> So this will be:
> 
> Master----Firewall------Slave----Lots of targets
> |
> +---FW2----Slave2----Lots of other targets
> 
> 
> 
> So Slave1 uses designations as hostnames in hostgroups.cfg:
> 
> site1_smtp01.foo.bar
> 
> and Slave2 uses site2_smtpxxx.foo.bar, this will be transmitted to the
> master, and there is an unique parts as identifier.
> 
> Also has the advantage, that you do not need to buy extra firewall,
> because all data is coming from the internal side of the network.
> 
> The extra box also is needed badly to offload some work from the
master.
> 
> HTH
> Olaf
> 
> --
> Olaf Hoyer        ohoyer at gaff.hhhr.ision.net
> Fuerchterliche Erlebniss geben zu raten,
> ob der, welcher sie erlebt, nicht etwas Fuerchterliches ist.
> (Nietzsche, Jenseits von Gut und Boese)
> 
> 
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