Nagios Uptime Plugin

After the recent nagios-plugins update that we applied to our centos nagios box, we found our uptime check we created no longer worked. The uptime check we created using the check_snmp plugin to grab the OID for Linux HOST-RESOURCES-MIB::hrSystemUptime.0 or for other devices 1.3.6.1.2.1.1.3.0 and then tell us if the uptime for a device was less than ten minutes. For some reason the new check_snmp plugin no longer parses the results of these MIB's in a similar manner. It reported the data correctly, but it would not trigger a critical alert when the uptime was less than what we specified.

In an attempt to get us back up and running I devised a bash script plugin to grab the snmp data manually parse it and report back the status. Here are the results aptly called check_uptime.sh:

#!/bin/bash

#Description: Nagios plugin to check uptimes of servers and equipment.

#Linux uses a different OID for uptime than does everything else. If you use the regular

#OID for Linux hosts you will get an erroneous answer.

#Version 0.5

#Created by Jason Wasser

#Until I can learn how to parse command line arguments, we must accept the command line

#argments in order.

#$1 - hostname

#$2 - community name

#$3 - critical (automatically chooses less than) value in ticks (100 ticks per second)

#$4 - OID - choose between one of the values below

#OID for Linux: HOST-RESOURCES-MIB::hrSystemUptime.0

#OID for Other: 1.3.6.1.2.1.1.3.0

UPTFULL=`snmpget -v1 -c $2 $1 $4 | cut -d "=" -f 2`

UPT=`echo $UPTFULL | cut -d "(" -f 2|cut -d ")" -f 1`

if [ $UPT -lt $3 ]; then

echo "CRITICAL -" "$UPTFULL"

RET=2

elif [ $UPT -gt $3 ]; then

echo "OK -" "$UPTFULL"

RET=0

else

echo "UNKNOWN -" "$UPTFULL"

RET=3

fi

exit $RET