parents/dependencies confusion

[brianmas at highstream.net]

Quoting Scot Jenkins <scotjenkins at gmail.com>:

> On 10/4/05, brianmas at highstream.net <brianmas at highstream.net> wrote:
> >
> > ok what I have done is set up a hosts.cfg entries for the default gateway
> of the
> > 3 networks and set the 'parents' directive for all hosts in each respective
> > networks. I guess I wasn't thinking about monitoring machines that are not
> > under our control (all our servers are colo'd).
> >
>
> I find looking at the "status map" cgi also helps to see if you have
> your "parents" set up correctly.
>
> I have multiple NIC's on my firewall and set each NIC up as it's own
> host to more accurately reflect the network and then use the (nic)
> host as a parent for things beyond it.  So I have something like this:
>
> Assume nagios runs on the firewall box itself.
>
>  nagios process ---- fw_inside_nic --- inside_host_a
>   |        |
>   |       +----fw_dmz_nic --- dmz_host_a
>   |
>   +---- fw_outside_nic --- dsl_router ----- isp_upstream_link ----
> outside_host_a
>
> Then in my config:
>
> inside_host_a's parents == fw_inside_nic
> dmz_host_a's parents == fw_dmz_nic
>
> outside_host_a's parents == isp_upstream_link
> isp_upstream_link's parents == dsl_router
> dsl_router's parents == fw_outside_nic
>
> This seems to work well.  If I were to unplug my dsl router, the
> dsl_router host would show down and the isp_upstream_link and
> outside_host_a will show unreachable.

yes, I understand, if we had a single point of access on the network such as a
router or
firewall I would have known what to do, but all these machines have 1 interface
with a firewall on each one. So I set up the default gateways for each network
as a host instead.

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.


> HTH,
>
> Scot




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