parent/child pains

[Ludwig Pummer]

Oops, forgot to send this to the list.



________________________________

	From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of Rossz
Vamos-Wentworth
	Sent: Friday, October 21, 2005 10:18 AM
	To: Nagios-users at lists.sourceforge.net
	Subject: [Nagios-users] parent/child pains
	
	
	I guess I'm misunderstanding how this works.  I'm running Nagios
1.2 on Debian. 
	
	I configured the remote servers to have my local router as their
parent.  The router status is tested by checking for an internet
connection from the nagios server.  The idea being when my nagios host
looses its internet connection I won't receive a ton of notifications.
I have one of the remote systems monitoring my nagios server just so it
can alert me when there is a connectivity problem.  This morning the
nagios server lost its internet connection and queued up a mess of
alerts for all the remote services it is monitoring.  It couldn't
actually send them out since that requires an internet connection.  When
connectivity returned all those "down" alerts went out, followed closely
by the "Up" alerts. 
	
	I did receive the notification from the remote system letting me
know my nagios server had a problem and recovered, so at least something
worked right. 
	
	
	-- 
	Rossz 
	
	

I think of parents as "previous hop" from the perspective of the Nagios
server doing the checking.
 
I'm not sure I've got the right picture of your setup, but I'll take a
stab at it.
Your Nagios --- Router --- Internet --- Remote Nagios
                              +-------- Remote service 1
                              +-------- Remote service 2
                              +-------- Remote service 3

>From the perspective of "Your nagios",

Router has no parent
Internet's parent is Router
Remote Nagios and Remote service 1-3's parent is Internet

If you don't already have an "Internet" host, make one and set its
address to the first hop after your router when you do a traceroute out
from "Your Nagios" (operating on the assumption that if the first hop is
the first router after your DSL/Cable/T1/whatever line).

>From the perspective of "Remote Nagios",

Internet has no parent (you'll want to use a different address, since
Remote Nagios' first hop won't be the same as Your Nagios's)
Router's parent is Internet
Remote service 1-3's parent is Internet (unless the Remote services are
behind the same connection as Remote Nagios, in which case they will
have no parents)
Your Nagios' parent is Router

--Ludwig Pummer

 

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