Nagios3, monitoring CPU usage without SNMP

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Is there currently anyway to monitor CPU usage with Nagios3 that doesn't involve SNMP setup? I want to setup notifications if I'm going above a certain threshold, such as 55% of the CPU time is being used up by the system.

Best Answer

The only other way other than SNMP to get remote information off a system that isn't checking a network based service (ie- HTTP, SMTP, POP, etc) is to use NRPE which means installing the NRPE daemon on the client machine and configuring the checks you want to be able to run locally over NRPE. NRPE uses SSL to communicate between machines over a port, 5666 by default, and can run any Nagios plugin locally on the client and transmit the result back to Nagios as if it had been run on the Nagios server.

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If you are having timeout issues due to load on the server, then I would submit that Nagios and the NSClient is working correctly. Other options will try to connect to the sever as well and have the same types of issues if it cannot respond due to load.

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Router – Monitoring router bandwidth usage via Nagios and SNMP

I did this with a cron script, stores current value in a temp file then next time uses it to calculate bandwidth utilization since last run.

#!/bin/bash

email_address=""
router_ip=""

# 80% BANDWIDTH [ (384000bps) 48,000Bps ] - 20% = 38,400 Bps
alertBW="76800"

lastBWFile="/var/log/ciscoGW.log"
lastBW=`cat $lastBWFile | awk '{print$2}'`
lastTime=`cat $lastBWFile | awk '{print$1}'`

curBW=` snmpget  -c snmap_name -v 1 $router_ip IF-MIB::ifOutOctets.2  | awk '{print$4}'`

let diffBW=$curBW-$lastBW
#echo "Diff BW: $diffBW"
timeNow=`date +%s`
let diffTime=$timeNow-$lastTime
let alertBW=$alertBW*$diffTime

echo "$timeNow $curBW" > $lastBWFile

if [ $diffBW -gt $alertBW ]; then
#       echo "Over limit!"
        echo "Bandwith used over $diffTime seconds: $diffBW" | mail -s "BANDWIDTH OVER LIMIT!!!!" $email_address
fi

Since I was more interested in actual peaks I've since moved to using rrdtool:

#start 15 minutes ago
#end 5 minutes ago since rrdtool queries every 5 minutes 
rrdtool fetch $FROM MAX -s -900 -e -300

Best Answer

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