service dependency
Jason Martin
jhmartin at toger.us
Wed Jan 28 19:05:51 CET 2004
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This is fairly well spelled out at
http://nagios.sourceforge.net/docs/1_0/dependencies.html, but assuming
that apache is dependant on mysql, you'd get:
> apache-svc=UP, mysql-svc=DOWN - What notification should I get? Mysql
is down
> apache-svc=DOWN, mysql-svc=DOWN - What notification should I get? Mysql
is down
> apache-svc=DOWN, mysql-svc=UP - What notification should I get? Apache
is down
- -Jason Martin
On Wed, 28 Jan 2004, Neil wrote:
> Ok. So, are you saying here that when apache-svc goes down too, you will not
> receive any notifications anymore related to apache-svc?
>
> I think this matrix will help me better:
>
> apache-svc=UP, mysql-svc=DOWN - What notification should I get?
> apache-svc=DOWN, mysql-svc=DOWN - What notification should I get?
> apache-svc=DOWN, mysql-svc=UP - What notification should I get?
>
> Please bear with me for now. :)
>
> Thanks again.
>
> Jason Martin writes:
>
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> >
> > The idea is that somewhere you are monitoring both mysql-svc and
> > apache-svc. If mysql-svc goes down you would get a notification from
> > Nagios about it. However, if apache-svc depends on mysql-svc, you already
> > know that apache-svc will have problems and thus don't want a notificaiton
> > on it if mysql-svc is broken.
> >
> > - -Jason Martin
> >
> > On Wed, 28 Jan 2004, Neil wrote:
> >
> >> Hi Jason,
> >>
> >> So the purpose of servicedependency is to hold back notifications. Now, my
> >> question is, why would we not want to receive emails from nagios when the
> >> depended upon service fails? Like in my previous scenario, I still want to
> >> know if mysql-svc failed.
> >>
> >> I hope, the functionality I mentioned can be implemented in the future. If
> >> was just a good programmer, I would love to contribute. :(
> >>
> >> Thanks again.
> >>
> >>
> >> Jason Martin writes:
> >>
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> >> >> 1. What I want to happen is that when mysql-svc on svr-B fails, I would like
> >> >> to get notified that apache-svc on svr-A will not work properly too.
> >> > That functionalty doesn't exist right now. Service depenendcies are used
> >> > for event *suppression*, not generation.
> >> >
> >> >> 2. I was also thinking that in the Service Detail(left pane of the nagios
> >> >> monitor webpage), the dependent host will have a different color on the
> >> >> dependent service if the depended upon service is down.
> >> > That functionality is also not implemented at this time.
> >> >
> >> > - -Jason Martin
> >> >
> >> >
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