parents/dependencies confusion

[Guy B. Purcell]

On Oct 5, 2005, at 09:20, brianmas at highstream.net wrote:

> The Status Map does show what I'd expect: nagios ---> gateway/ 
> parent machine
> ---> fans out to a bunch of servers. One thing though the "Status  
> Information"
> for 2 of the 3 gateways are in "Pending" state. They are  
> pingable ... little
> confused on that. It's been 20 hours. hm adding a service to them  
> (ping, kinda
> redundant) and they now show  as OK. Known issue? Still using 1.2 btw.

Well, yes, it's a known issue in the sense that it's the way Nagios  
works:  it doesn't assume initial states.  When you add a new  
service, it's in the Pending state until the service check returns a  
different state.  If, as in your case, you add a new host with _no_  
associated services, then Nagios will keep the host in the Pending  
state.  If you add a service, Nagios will then track the host's state.

I've often wondered whether I consider it a bug or not that Nagios  
doesn't just force one initial active host check for new hosts.  I'm  
still on the fence, because I need to run some tests.  It all comes  
down to what happens if such a service-devoid host (let's say it's a  
router) goes down and is the parent of other hosts:  in that case,  
active checks of the child hosts should ensue (and fail), followed by  
an active check of the router (which also fails), and an active check  
of the router's parent (which we'll assume succeeds)--all of which  
should yield one DOWN alert for the router, and possibly some  
UNREACHABLE alerts for its children (I forget--been a while since  
I've read the docs).  If Nagios does that, and marks the host as back  
UP when it comes back up & the hosts & services beyond it are  
"visible" once again, then I'd consider the lack of an initial host  
check a quirk of Nagios, rather than a bug; otherwise, I'd consider  
it a bug.

-Guy




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