Alerting on 'rate' thresholds
Tedman Eng
teng at dataway.com
Thu Oct 28 23:03:10 CEST 2004
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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