Service Dependencies "wildcarding" error ?

[Carroll, Jim P [Contractor]]

Paulo, that looks like an excellent scenario to streamline!
 
At some point I'll be trying my hand at service dependencies.  Here's the
scenario I hope to streamline:
 
- host1 is running NRPE
     - nrpe.cfg has several tests configured
- most other hosts will be similarly configured with NRPE
- some hosts will be running a superset of the NRPE definitions
 
Risk in this scenario:  if the NRPE daemon is down and Nagios starts
checking those services, naturally it will fail for each and every NRPE
service test defined.
 
Goal:  If NRPE is down, be notified that NRPE is down.  Silence on all the
NRPE tests.
 
Actually, I wouldn't mind some input on one aspect of setting this up.  I'm
torn between making one of the NRPE tests the service depended on by the
other NRPE tests (for a given host), versus just using check_tcp to verify
that the NRPE daemon is up and listening.  Thoughts anyone?
 
jc

-----Original Message-----
From: Paulo Pinto [mailto:japh at ip.pt]
Sent: Wednesday, October 16, 2002 7:07 AM
To: Scott; nagios-users at lists.sourceforge.net
Subject: Re: [Nagios-users] Service Dependencies "wildcarding" error ?


Hi.
 
Imagine the following scenario:
 
- 2 web servers, with 50 Vhosts each.
- 1 Alteon webswitch, virtualizing the 50 Vhosts
- Nagios is monitoring the 150 webservices. A failed service gets notified
by SMS. 
 
Now, without service dependencies, if a webserver goes down, you get 50 SMS.
If BOTH webservers go down, you get 150SMS. 
 
WITH service dependencies, you can make your webtests depend on the
RealServers status on the Alteon... if 1 webserver goes down, you get 1 SMS,
if both go down you got 2 sms.
That's why :-)
 
Anyway, I've already seen in the changelog that wildcarding was addedd on
1.0b6 (I'm running beta5) ... I'll upgrade it and see if it works :-)
 
Hugz all.
 

----- Original Message ----- 
From: Scott <mailto:lists.scott at themagicbox.net>  
To: Paulo Pinto <mailto:japh at ip.pt>  ; nagios-users at lists.sourceforge.net
<mailto:nagios-users at lists.sourceforge.net>  
Sent: Wednesday, October 16, 2002 11:32 AM
Subject: Re: [Nagios-users] Service Dependencies "wildcarding" error ?

how canb a service be dependant on all services like this? wouldnt you just
have a host dependancy and be done with it?

----- Original Message ----- 
From: Paulo Pinto <mailto:japh at ip.pt>  
To: nagios-users at lists.sourceforge.net
<mailto:nagios-users at lists.sourceforge.net>  
Sent: Tuesday, October 15, 2002 11:00 AM
Subject: [Nagios-users] Service Dependencies "wildcarding" error ?

Hi all.
 
I'm trying to setup service dependencies.
 
In my case, I want ALL services in host A to be dependent of service SERVICE
on host B.
 
So, I've configured dependencies.cfg like this:
 
define servicedependency{
        host_name                       HOST-B
        service_description             SERVICE
        dependent_host_name             HOST-A
        dependent_service_description   *
        execution_failure_criteria      n
        notification_failure_criteria   u,c
        }

 
Guess what:
 
$ /path/to/nagios/bin/nagios -v /path/to/nagios/etc/nagios.cfg
 
(...)
Error: Dependent service specified in service dependency for service '*' on
host 'HOST-A' is not defined anywhere!
Error: Dependent service specified in service dependency for service '*' on
host 'HOST-A' is not defined anywhere!
(...)
 
I'm using Nagios 1.0b5, btw
 
Any hints ?
 
Hugz,
 
Japh
 
 
 


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