multiple host parents

[Christoph Maser]

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Daniel Wüthrich wrote:
> Hi
>
> I had some discussions about host parents. If using more than one
> parent  nagios assumes that the parents are redundant paths. But in our
> VLAN  environment I need the possibility to define multiple parents
> where ALL  parents are needed. E.g. a Host depends on a router AND a
> switch (this is  possible, not the host depends on the switch and the
> switch depend on the  router!).
>
> It doesn't seem that there's a possibility to implement this,
> especially  in a big network. Therefore I modified nagios source:
> I added a new variable in the host definition where I can say whether
> the  host depends on at least one parent (as it already is) or whether
> it  depends on all parents at the same time.
>
> In our network it does work and now I would like to contibute this to
> the  official source.
>
> Daniel

Independent of nagios i had some thoughts about service-dependencies. My
prefered solution is to "weight" the dependencies. e.g.:
serviceA depends on serviceB weight 1 and serviceC weight 0.5

If in this szenario serviceC fails serviceA is degraded 50%. If serviceB
fails serviceA fails also. Additionally a group of similar services
should be definable with a "weight" for each service and a "weight" for
the complete group.

Chris



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