Monitoring routers with accurate dependancies

[Carroll, Jim P [Contractor]]

I'd like to suggest that you take a look at the 'parents' directive, for one
thing.

Also, what you suggest sounds quite viable, moreso than you might think.
Here's a crude ASCII drawing of what a trivial example might be:

   Nagios
    host
     |
   [Int0]
   Router
[Int1][Int2]
  |      |
hosta  hostb

You would then:

- select the IP address of Int0 to do your comprehensive service checks
- define a ping service for each of the IPs for Int1 and Int2
- make Int0 a parent of Int1
- make Int0 a parent of Int2
- make Int1 a parent of hosta
- make Int2 a parent of hostb

Here are examples of what you would (or would not) be notified on:

- if hosta has a service problem, you would be notified
- if hosta goes down, you would be notified only of that (and not of any of
hosta's services)
- if Int1 goes down, you would be notified only of that
  - all host and service checks of hosta would wait, pending the resumption
of Int1
- if Int0 goes down, both Int1 and Int2 (and of course hosta and hostb)
would be ignored until the resumption of Int0

One bonus of using this approach:  Status Map (and 3-D Status Map) would
show the hierarchies, not one Big Flat Map.

HTH.

jc


> On Tue, 25 Feb 2003, Frank Sweetser wrote:
> 
> > I'm at an impasse here.  I've got a number of routers that 
> need to be
> > monitored, and I can't find a good way to represent them in nagios.
> > 
> > I've looked through the mailing lists a bit, and the 
> closest scenario that
> > I can find is someone dealing with a multihomed host.  I'd 
> rather not create
> > a gaggle of hosts for each router.  I'd like to be able to 
> create a single
> > host with the circuitless IP for monitoring services on the 
> router (checking
> > routes, SNMP agent, etc) and a ping based service for 
> checking the status of
> > each of the other interfaces.  This would work fine, except 
> that downstream
> > nodes can't be made to depend upon a service.
> > 
> > So does anyone have any suggestions how this could be 
> configured?  Or is there
> > any chance that in future versions, a host could be made to 
> depend upon a
> > service instead of another host?
> > 


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