Service-Parent? Dependencies between nrpe agents and it's checks
John P. Rouillard
rouilj at cs.umb.edu
Thu Oct 20 19:44:32 CEST 2005
In message <1129816562.26376.159.camel at chi101100.int.tt.local>,
jeff vier writes:
>On Thu, 2005-10-20 at 15:05 +0200, Karim Vaes wrote:
>> Is it possible to build a kind of system (that is maintainable) that
>> makes sure if a nrpe isn't reacable, that it acts as a kind of parent,
>> as is with hosts?
>
>Just put check_dummy on your nrpe-checked hosts and make it a
>servicedependency of the other nrpe checks.
What you are recommending is to use check_dummy to define a
"check_nrpe" service and then creating a ton of service dependencies
of the form:
define servicedependency{
dependent_host_name MYHOST
dependent_service_description service_check_1_via_nrpe
host_name MYHOST
service_description check_nrpe
}
Repeat for all 20/30 service checks. However I claim that's not very
maintainable. What is more maintainable is a way to do the following:
define servicedependency{
dependent_servicegroup_name CHECKED_VIA_NRPE_GROUP
host_name =
service_description check_nrpe
}
Where the = sign says:
use the same host as in the dependent service
So a dependent_service_group that consisted of:
host1;svc1
host2;svc1
host2;svc2
would expand to the equivalent of:
define servicedependency{
dependent_host_name host1
dependent_service_description svc1
host_name host1
service_description check_nrpe
}
define servicedependency{
dependent_host_name host2
dependent_service_description svc1
host_name host2
service_description check_nrpe
}
define servicedependency{
dependent_host_name host2
dependent_service_description svc2
host_name host2
service_description check_nrpe
}
Then when defining a (new) service, you just add the servicegroups
line in the service definition:
define service {
hostgroup_name standard_host_checks
...
servicegroups CHECKED_VIA_NRPE_CROUP
}
and you will automatically get the service dependencies set up.
This way I can add a new host to a hostgroup (standard_host_checks),
and it will immediately get all the NRPE tests and dependencies. No
other command file changes are needed. Just select the hostgroups the
host should belong to an viola. Makes it a LOT less error prone.
I am working on some C coding, but it is not easy going. I may craft
together a filepp based solution instead.
Note, the examples/pseudo examples above only work with nagios 2.0.
-- rouilj
John Rouillard
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