parent host relatiionship

[Neil]

Hi Matt, 

Let say we have this topology: 

  Please view in a fixed-width font such as Courier. 

                     nagios server
                        +-----+
                        |     |
                        |     |
                        |     |
                        |     |
                        +-----+
                           |
                           |
                           |link-A
                           |
                           |
                           |
                          /--\
                         |    | router-A
                         |    \
                         /\--/ \\
                        /        \
           link-AB     /          \\ link-AC
                     //             \
                    /                \
               /--\/                  \ /--\
    router-B  |   /|                   |    |
              |    |                   |    | router-C
               \+-/                     \-+/
                |                         |
       +--------+---+                +----+--------+
       |            |                |             |
       |            |                |             |
       |            |              +-+-+         +-+-+
     +-++         +-++             |   |         |   |
     |  |         |  |             +---+         +---+
     |  |         |  |            --------      --------
     |  |         |  |
     |  |         |  |                 workstations
     +--+         +--+ 

   svr-A          srv-B 

What I want to happen is receive notifications only if srv-A or srv-B is 
really down. Also, what I want is to not get tons of notifications if hosts 
are behind a down parent. So something like this message is what I want to 
receive: 

1. router-A or router-B is down
2. svr-a or svr-B is unreachable
3. or svr-a/svr-B is down 

Can you give me an example of how a host should be configured in hosts.cfg 
this way? 

I am seeing now the power of Nagios after reading your POST. :) 

Thanks in advance for your help. 

Ronneil 

Matt Pounsett writes: 

> On Sat, 17 Jan 2004, Ric Moseley wrote: 
> 
>> No one attempted to answer this so I am sending it again.   
>> 
>> If I do want to get notifications for hosts that are behind another
>> server/router that is down at the time is the 'parents' option in the host
>> config the option to use?  When I set that option up to the server/router
>> that is in front of the host and then turn off the notifications option of
>> 'u' (unreachable) will I not get emails if the router goes down about the
>> server behind it going down?
> 
> It sounds a bit like you might be confusing two related, but different
> features of Nagios.  I'll try and give you a quick rundown on how this works,
> from which I think you should be able to pick out the things you need for your
> setup. 
> 
> First, let's assume a simple set of hosts.  The Nagios machine (N),     N
> connected to a switch (S) which has two other machines connected in     |
> turn to it (A and B).                                                   |
>                                                                         S
> If you want Nagios to be able to draw you a useful status map,          /\
> you should set the "parents" for hosts A and B to S.  This             /  \
> indicates to Nagios that, in order to reach A or B, packets must      A    B
> flow through S.   
> 
> Now, the other option involved here is the 'notification_options'.
> Notification option 'D' tells nagios to complain when a host is down.  A host
> is down when at least one of its parents are reachable, but it is not.
> Notification option 'U' tells nagios to complain when a host is unreachable.
> A host is unreachable when all of its parents are either down or unreachable. 
> So, if your 'notification_options' for S, A and B are all set to "D,R" (R is
> Recovery), and if you were to pull the power on S, you would only be notified
> about S being down, since A and B get marked as Unreachable, and you haven't
> included the Unreachable option for notification.  If, instead of pulling the
> plug on S you left it up and pulled the plug on A and B, then you'd get
> notified of A and B being down. 
> 
> If you also want to be notified when hosts are unreachable, then include the
> 'U' option in notification_options. 
> 
> Does that answer your question? 
> 
> -- 
> Matt Pounsett                 CIRA - Canadian Internet Registration Authority
> Technical Support Programmer                    350 Sparks Street, Suite 1110
> matt.pounsett at cira.ca                                 Ottawa, Ontario, Canada
> 613.237.5335 ext. 231                                      http://www.cira.ca 
> 
>  
> 
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_______________________________________________
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::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null