Service dependencies

[Thomas Guyot-Sionnest]

I guess you mean setting it up in the service definition? But you'll have to
define which host here as well. So is't excatly the same as the
servicedependency  definition.

Actually I'm just thinking there could be another way. What if by omiting
one of the host_name / hostgroup_name variable, instead of failling check it
would turn the "same host" mode.

define servicedependency {
  service_description           Master service
  dependent_hostgroup_name      pool1,pool2
  dependent_service_description Slave 1,Slave 2,Slave 3
  same_host_dependency          1
  notification_failure_criteria c,u
}

There is no host_name defined for "Master service", so for each host in
"dependent_hostgroup_name" it creates a dependency to "Master service" on
the same host.

Does it makes sense?

Thomas

> -----Original Message-----
> From: nagios-devel-bounces at lists.sourceforge.net 
> [mailto:nagios-devel-bounces at lists.sourceforge.net] On Behalf 
> Of Tobias Mucke
> Sent: October 19, 2006 11:31
> To: Nagios-Devel
> Subject: Re: [Nagios-devel] Service dependencies
> 
> Hi,
> 
> since we are using Nagios in a large environment here, we 
> also have to fight with service dependencies and the approach 
> how to configure it. What I would like to see in Nagios is 
> the possibility to define that a service always depends on 
> another service without even mentioning a host or hostgroup. 
> Look at the example.
> 
> I have a service called disk_os which checks all filesystems 
> of a system or even a large group of systems. I do this by 
> using nrpe. To check if nrpe is running I have a service 
> called nrpe. Today I have to configure for every host with  
> disk_os a single servicedependency to nrpe.
> 
> What I want to do is, to define that disk_os will always 
> depend on nrpe, so I don't have to mention that for each host 
> again and again.
> 
> Thanks.
> 
> Tobias
> 
> 
> -----Original Message-----
> From: "Thomas Guyot-Sionnest" <Thomas at zango.com>
> To: "Thomas Sluyter" <nagios at kilala.nl>,"Nagios-Devel" 
> <nagios-devel at lists.sourceforge.net>
> Date: Wed, 18 Oct 2006 23:51:25 -0700
> Subject: Re: [Nagios-devel] Service dependencies
> 
> > 
> > Sorry to bring up an old thread, but there were no follow 
> up on this. I
> > just find myself in the same situation (need one-to one mapping for
> > every hosts) and remembered this old thread.
> > 
> > How hard would if be to add a flag in servicedependency 
> definitions that
> > force every service dependency to reside on the same host, 
> and ignore
> > missing services.
> > 
> > So I could write something like this:
> > 
> > define servicedependency {
> >   hostgroup_name                pool1,pool2
> >   service_description           Master service
> >   dependent_hostgroup_name      pool1,pool2
> >   dependent_service_description Slave 1,Slave 2,Slave 3
> >   same_host_dependency          1
> >   notification_failure_criteria c,u
> > }
> > 
> > And I'd get:
> > 1: dependencies across services on the same host for every 
> hosts defined
> > in pool1 and pool2
> > 2: missing dependent services would be silently dropped.
> > 
> > Or to be more flexible different values for 
> same_host_dependency could
> > determine if Nagios does #1 or #1 & #2.
> > 
> > If you don't like #2, doing #1 would already reduce 
> significantly the
> > config required.
> > 
> > I never checked the pre-flight code, but I'd assume it 
> shouldn't be that
> > hard. I guess all you have to do is skip dependency creation on
> > conditional statements.
> > 
> > Thanks,
> > 
> > Thomas
> > 
> > > -----Original Message-----
> > > From: nagios-devel-bounces at lists.sourceforge.net 
> [mailto:nagios-devel-
> > > bounces at lists.sourceforge.net] On Behalf Of Thomas Sluyter
> > > Sent: Monday, June 12, 2006 5:58
> > > To: Nagios-Devel
> > > Subject: Re: [Nagios-devel] Service dependencies
> > > 
> > > I'm sorry if this is the second time this message gets sent to the
> > > list. I had a hunch that it didn't make it the first time 
> I sent it...
> > > 
> > > ============
> > > 
> > > Hi all.
> > > 
> > > I was actually wondering about the exact same thing Dirk 
> was thinking
> > > about! Such a shortcut would really help out in easing the use of
> > > dependencies.
> > > 
> > > > Try this...
> > > >
> > > > define servicedependency{
> > > > hostgroup_name windows-servers
> > > > service_description NRPE_NT
> > > > dependent_hostgroup_name windows-servers
> > > > dependent_service_description Drive_C
> > > > }
> > > 
> > > Ethan's solution wouldn't work if you look at it logically. Why?
> > > Because you're telling Nagios that:
> > > * All instances of service A in hostgroup X
> > > * Depend on all instances of service B in hostgroup X.
> > > 
> > > Meaning that all instances of A will "fail" if -any- instance of B
> > > goes down. That's not what we want to happen, is it? :p
> > > 
> > > Or am I completely off on this? Might be that I'm not reading this
> > > correctly.
> > > 
> > > As Dirk said: it would be great if there was some shortcut for
> > > telling Nagios that you want all instances of service A 
> in hostgroup
> > > X to be dependant of service B on -their-own- host. That way you
> > > could take care of all dependencies for a whole hostgroup 
> in a matter
> > > of a few dozen lines of code.
> > > 
> > > 
> > > - Thomas Sluyter (Cailin)
> > > 
> > > -----------------------
> > > This thread is located in the archive at this URL:
> > > http://www.nagiosexchange.org/nagios-devel.33.0.html?
> > > &tx_maillisttofaq_pi1[showUid]=18830
> > > 
> > > 
> > > 
> > > _______________________________________________
> > > Nagios-devel mailing list
> > > Nagios-devel at lists.sourceforge.net
> > > https://lists.sourceforge.net/lists/listinfo/nagios-devel
> > 
> > 
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