Monitoring tool for a large enterprice? Is Nagios suitable to any degree?

[Andrew Cruse]

nagios-users-admin at lists.sourceforge.net wrote:
> Subhendu Ghosh wrote:
> 
>> For link traffic/app response times  - MRTG/Cricket/Cacti with alerts
>> to Nagios
> 
> 
>   Could you or someone else please expound a bit on this?
> I'm running Cacti and Nagios, and the other day an event
> cropped up that I wasn't explicitly monitoring for in Nagios.
>  A single PVC went down but the other PVC picked up the load
> so Nagios remained blissfully unaware of the damage.  (I'm
> monitoring the interfaces individually now. :)  In the
> post-event reporting, I checked Cacti and saw that it had
> noticed the individual interface went down.  In the grand
> scheme of things it probably isn't a huge deal to have both
> Cacti and Nagios checking SNMP iface stats every 5 minutes,
> but it might be a problem for others depending on their
> network complexity.  (And I'm borderline - our FR cloud is
> only 56k with about 20 sites, so I have to balance immediacy
> of reporting versus soaking up a sizable percentage of the
> could's total available bandwidth just in making sure it's
> still there.  Cacti came along to help me tweak the interval_length.)
> 
>   Cacti's forums rumble about doing this, but I haven't
> managed to find a clear picture about it yet.
> 
>   Or are you just thinking about something like
> user-developed glue to check the RRDs and give Nagios a
> holler if the data indicates it should?

There's two ways that I do it, depending on the situation.  If it's an
item that only needs to be polled every 5 minutes or less, I let Cacti
do the polling, and then use the check_rrd plugin (google should turn it
up) to check the values Cacti gets and alert based on those values.  If
I need polling more often than every 5 minutes, I do the polling in
Nagios and uses Nagiostat to create the RRD and then use Cacti to
display graphs from the RRD files created by Nagiostat.

Andrew



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