[ClusterLabs] Cluster monitoring

[Arjun Pandey]

Will have a look.

Thanks
Arjun

On Wed, Oct 21, 2015 at 8:26 PM, Ken Gaillot <kgaillot at redhat.com> wrote:

> On 10/21/2015 08:24 AM, Michael Schwartzkopff wrote:
> > Am Mittwoch, 21. Oktober 2015, 18:50:15 schrieb Arjun Pandey:
> >> Hi folks
> >>
> >> I had a question on monitoring of cluster events. Based on the
> >> documentation it seems that cluster monitor is the only method
> >> of monitoring the cluster events. Also since it seems to poll
> >> based on the interval configured it might miss some events. Is
> >> that the case ?
> >
> > No. the cluser is event-based. So it won't miss any event. If you
> > use the cluster's tools, they see hte events. If you monitor the
> > events you won't miss any either.
>
> FYI, Pacemaker 1.1.14 will have built-in handling of notification
> scripts, without needing a ClusterMon resource. These will be
> event-driven. Andrew Beekhof did a recent blog post about it:
> http://blog.clusterlabs.org/blog/2015/reliable-notifications/
>
> Pacemaker's monitors are polling, at the interval specified when
> configuring the monitor operation. Pacemaker relies on the resource
> agent to return status for monitors, so technically it's up to the
> resource agent whether it can "miss" brief outages that occur between
> polls. All the ones I've looked at would miss them, but generally
> that's considered acceptable if the service is once again fully
> working when the monitor runs (because it implies it recovered itself).
>
> Some people use an external monitoring system (nagios, icinga, zabbix,
> etc.) in addition to Pacemaker's monitors. They can complement each
> other, as the external system can check system parameters outside
> Pacemaker's view and can alert administrators for some early warning
> signs before a resource gets to the point of needing recovery. Of
> course such monitoring systems are also polling at configured intervals.
>
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