Service dependencies

Thomas Guyot-Sionnest Thomas at zango.com
Fri Oct 20 17:41:20 CEST 2006
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Oops! There's almost certainely a bug (I didn't experienced it but I fixed
it) when you have multiple dependency definitions where some of them are not
same-host.

After a good sleep I realised that it would make much more sense to have
host_name set and dependent_host_name unset.

So now here's the new usage.

How to use it:

Just omit both "dependent_host_name" and "dependent_hostgroup_name" entries
in a servicedependency definition. Ex:.

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

Still EXPERIMENTAL (see comment in my previous post)

Please send me any bugs/comments you have with this patch...

Thomas Guyot-Sionnest
UNIX Systems Administrator
Zango
E: thomas at zango.com
P: 514.787.4714 |  F: 514.787.4707

www.zango.com
Read our blog at http://blog.zango.com 

> -----Original Message-----
> From: nagios-devel-bounces at lists.sourceforge.net 
> [mailto:nagios-devel-bounces at lists.sourceforge.net] On Behalf 
> Of Thomas Guyot-Sionnest
> Sent: October 20, 2006 1:03
> To: Nagios-Devel
> Cc: william(at)elan.net
> Subject: Re: [Nagios-devel] Service dependencies
> 
> Alright! I found out I'm not that bad in C and made my own patch. :)
> 
> What it does:
> 
> When Nagios duplicate servicedependency definitions, it checks for any
> missing required variables. When it checks for empty host_name entry,
> instead of returning an error I set a flag and fill-up the 
> master_hostslist
> using the dependent_host_name entry instead.
> 
> Later in the "duplication" loop, if the flag is present I 
> don't duplicate
> any definition that doesn't have the same hostname for master 
> and dependent
> host.
> 
> How to use it:
> 
> Just omit the "host_name" entry in a servicedependency definition ex:.
> 
> define servicedependency {
>  service_description           Master service
>  dependent_hostgroup_name      pool1,pool2
>  dependent_service_description Slave 1,Slave 2,Slave 3
>  notification_failure_criteria c,u
> }
> 
> WARNING: This patch is EXPERIMENTAL. It was only tested with 
> the expected
> configuration. I DID NOT TEST ANY NORMAL CONFIGURATION; 
> NEITHER DID I TEST
> CONFIGURATION ERROR HANDLING. I'll review and test this patch 
> thoughtfully
> as soon as I get some spare time.
> 
> Please send me any bugs/comments you have on this patch...
> 
> Thomas
> 
> > -----Original Message-----
> > From: william(at)elan.net [mailto:william at elan.net]
> > Sent: Thursday, October 19, 2006 22:42
> > To: Thomas Guyot-Sionnest
> > Cc: Tobias Mucke; Nagios-Devel
> > Subject: Re: [Nagios-devel] Service dependencies
> > 
> > 
> > On Thu, 19 Oct 2006, Thomas Guyot-Sionnest wrote:
> > 
> > > 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
> > > }
> > 
> > Interestingly enough I made a patch (for 2.2 & 2.3) that does almost
> > exactly that. But I did not do it cleanly as I did not add 
> new option
> > and changed the behavior so that:
> > 
> > define servicedependency {
> >    hostgroup_name      		group1
> >    servicegroup_name		master_servicegroup
> >    dependent_servicegroup_name   slavegroup1,slavegroup2
> >    notification_failure_criteria c,u
> >    execution_failure_critieria	n
> > }
> > 
> > would add dependency for each host in hostgroup from 
> services in master
> > group to all services in slave groups.
> > 
> > > 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
> > >>>
> > >>>
> > >> --------------------------------------------------------------
> > >> -----------
> > >>> Using Tomcat but need to do more? Need to support web
> > >> services, security?
> > >>> Get stuff done quickly with pre-integrated technology to
> > >> make your job easier
> > >>> Download IBM WebSphere Application Server v.1.0.1 based on
> > >> Apache Geronimo
> > >>>
> > >> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&
> > >> dat=121642
> > >>> _______________________________________________
> > >>> Nagios-devel mailing list
> > >>> Nagios-devel at lists.sourceforge.net
> > >>> https://lists.sourceforge.net/lists/listinfo/nagios-devel
> > >>>
> > >>
> > >> --------------------------------------------------------------
> > >> -----------
> > >> Using Tomcat but need to do more? Need to support web
> > >> services, security?
> > >> Get stuff done quickly with pre-integrated technology to make
> > >> your job easier
> > >> Download IBM WebSphere Application Server v.1.0.1 based on
> > >> Apache Geronimo
> > >> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&
> > >> dat=121642
> > >> _______________________________________________
> > >> Nagios-devel mailing list
> > >> Nagios-devel at lists.sourceforge.net
> > >> https://lists.sourceforge.net/lists/listinfo/nagios-devel
> 
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