Best way to monitor application clusters

[Hari Sekhon]

In the contrib directory of the standard plugins distribution there 
should be a check_cluster and better check_cluster2.c which you can 
compile to check a bunch of hosts or services and then go to warning or 
critical state only if a certain number of them fail.

Not used it myself, but it seems like exactly what you are looking for.

-h

Hari Sekhon



Paul Weaver wrote:
>
> I've recently started using nagios in our development environment, and 
> have knocked a few plugins for some of our programs (i.e. monitor a 
> log on a remote server to make sure it's growing, but not growing too 
> fast or too slow, or jumbo pings between two remote machines), which 
> is very impressive.
>
> One thing I would like to monitor is a group of hosts/services, and 
> flag a warning if x% are not available, and a critical if y% are 
> offline. A common example would be checking DNS services. If you have 
> 4 DNS servers, you don't want to be woken up at 3AM if one falls 
> offline, but if 3 are offline you would, and if 4 are offline you want 
> an APB. You still want to see the servers are offline though on a 
> webpage, and possible a notification in work hours.
>
> I'm aware of host/service groups, being one way of doing it, however 
> I'm unsure if notifications can be set based on % of hosts/services 
> available in a group.
>
> Another way would be a "virtual host", with a custom 
> "check_host_alive" which checks all hosts in a collection, and returns 
> an OK/critical/warning based on the number of failures, and likewise 
> with "virtual services". The original hosts could then be monitored 
> separately, or even not at all.
>
> For example, a service I would like to check is whether 3 mysql 
> databases are in sync with each other. I currently have a web page 
> that compares the log positions. It seems to me that logically the 
> service should run on the mysql boxes, however I only want it running on
>
> Another example would be I have a piece of java software (call it "A") 
> that must run on at least one of 4 machines, and preferably on 2 of 
> them. I don't care which machine it's on, but if it's not running I 
> want to be notified in red lights.
>
> I could have a simple "virtual service A", which would critical on 0, 
> warn on 1 and OK on 2 or more.
> This would be attached to "virtual host A", which would critical on 0, 
> warn on 1 and OK on 2 or more of the servers that the service runs on.
>
> I'd also like a "simple" login to the web page which would only 
> display the "clusters" of services/hosts, rather than the total view, 
> which would allow our support engineers to easilly see real problems, 
> and allow management to sleep hapilly with lots of green lights.
>
> I must admit I'm leaning to the virtual host/service thing, but I was 
> wondering if there's a standard/better way of monitoring these kind of 
> things?
>
> Thanks
>
>
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