Parent and Child Relationships

[Andreas Ericsson]

On 04/26/2012 04:55 AM, Jim McNamara wrote:
> I'm having an issue figuring out the parents remote routers that are
> connected over radio links to my main router. In one of my installations
> I have remote hosts (D) behind a remote router (C)  that is connected to
> my "main" network via two radio connections (B1,B2). The "main" router
> (A) is needed to communicate with all of the remote hosts (C,D) because
> of the necessary routing and natting.
> 

So A is parent to B1 and B2.
B1 and B2 are parents to C.
C is parent to hosts at D.

> I've used the two radios (B1,B2) plugged into the remote routers (C) as
> the parents for the router (C), and discovered that with two parents,
> nagios uses an OR style to determine the child host state. In this case,
> if either B1 or B2 is up, the child C should be up. This is accurate to
> a point in my case, but for the complete picture I need to introduce
> something like an AND to this. Specifically, to reach host C, A must be
> up, and either B1 or B2.
> 
> I had though to make A the parent of B1 and B2, but it simply isn't. B1
> and B2 can be reached with A down.
> 

Ah, so A isn't parent to B1 and B2 then.

> Is there a way to specify parent/child relationships where there are
> three parents, but one specific parent must be up and at least one of
> the other two?
> 

Possibly with hostdependencies, but I'm not sure how that would look.
It won't register as an outage though, but it should be possible to do
(roughly) what you want, and especially if your main concern is to
avoid notificationspam.

As a last-ditch resort, make the host-checks for C fail if A or both
B[12] are down by wrapping the check in something that calls livestatus
or some such before running the actual check.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

Considering the successes of the wars on alcohol, poverty, drugs and
terror, I think we should give some serious thought to declaring war
on peace.

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Nagios-users mailing list
Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null