Alerting on 'rate' thresholds

[Tedman Eng]

Cricket is the ticket.  It has built in threshold alarms.  You can set up
the alarm mechanism to submit a passive check to Nagios.  It'll
automatically clear the alarms as well.

Nagios is a great status monitor, but isn't a very good RRD poller.  If
using Nagios to do RRD polling, you'll find that you'll get irregular RRD
data intervals if you have a large number of down hosts in Nagios.  This is
because the down hosts makes Nagios too busy host-checking and not RRD
collecting.  Cricket is tied to cron, so it'll try to collect at very
regular intervals (which is the basis for good trending).



-----Original Message-----
From: Nathan Ward [mailto:nward at quicksilver.co.nz]
Sent: Wednesday, October 27, 2004 5:32 PM
To: nagios-users at lists.sourceforge.net
Subject: [Nagios-users] Alerting on 'rate' thresholds


I'd like to use nagios to monitor things like octets transferred on an 
interface per second, and other things that are typically constantly 
incrementing counters.

I am looking at using the nagios performance data framework for putting 
data in to RRD for graphing, which enables several possible ideas: - 
Write a wrapper around each of the checks that return this performance 
data, which knows how to read a value from RRD and compare it against a 
threshold. Of course, this means that I am checking data that is >= 
normal_check_interval old, not the data I have just read.
- Set up another service for each rate threshold I want to monitor, 
which runs a script to do the above test on an RRD. This means that the 
data I am checking is <= normal_check_interval. Still, it's not the 
most up to date data.

Ideally, I'd like to run a check script right after the performance 
data command (ie inserting data in to RRD) has been run.
Any bright ideas?
What about cricket?
How are other people monitoring 'rate' thresholds?

--
Nathan Ward



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