Nagios script: check_processes

2006-06-01 00:00:00

This script was written at the time I was hired by UPC / Liberty Global.

Basic monitor to check percentage of used physical RAM.

This script was quickly hacked together for my current customer, as a Q&D solution for their monitoring needs. It's no beauty, but it works. Written in ksh and tested with:

UPDATE 19/06/2006:

Cleaned up the script a bit and added some checks that are considered the Right Thing to do. Should have done this -way- earlier!

I've also -finally- changed the script so that it takes the Warning and Critical percentages from the command line.

UPDATE 15/07/2006:

Whoops... I just noticed that the file had gone missing <3 


#!/bin/ksh
#
# Free physical RAM monitor plugin for Nagios
# Written by Thomas Sluyter (nagiosATkilalaDOTnl)
# By request of DTV Labs, Liberty Global, the Netherlands
# Last Modified: 20-10-2006
# 
# Usage: ./check_ram
#
# Description:
# This plugin determines how much of the physical RAM in the 
# system is in use.
#
# Limitations:
# Currently this plugin will only function correctly on Solaris systems.
# And it really is only usefull at DTV Labs.
#
# Output:
# The script returns either a WARN or a CRIT, depending on the 
# percentage of free physical memory.
#

# Enabling the following dumps information into DEBUGFILE at various
# stages during the execution of this script.
DEBUG="1"
DEBUGFILE="/tmp/foobar"
rm $DEBUGFILE >/dev/null 2>&1
echo "Starting script check_ram." > $DEBUGFILE

# Host OS check and warning message
if [ `uname` != "SunOS" ]
then
        echo "WARNING:"
        echo "This script was originally written for use on Solaris."
        echo "You may run into some problems running it on this host."
        echo ""
        echo "Please verify that the script works before using it in a"
        echo "live environment. You can easily disable this message after"
        echo "testing the script."
        echo ""
        exit 1
fi

# You may have to change this, depending on where you installed your
# Nagios plugins
PATH="/usr/bin:/usr/sbin:/bin:/usr/local/bin:/sbin"
LIBEXEC="/usr/local/nagios/libexec"
. $LIBEXEC/utils.sh

print_usage() {
        echo "Usage: $PROGNAME warning-percentage critical-percentage"
        echo ""
        echo "e.g. : $PROGNAME 15 5"
        echo "This will start alerting when more than 85% of RAM has"
        echo "been used."
        echo ""
}

print_help() {
        echo ""
        print_usage
        echo ""
        echo "Free physical RAM plugin for Nagios"
        echo ""
        echo "This plugin not developped by the Nagios Plugin group."
        echo "Please do not e-mail them for support on this plugin, since"
        echo "they won't know what you're talking about :P"
        echo ""
        echo "For contact info, read the plugin itself..."
}

if [ $# -lt 2 ]; then print_help; exit $STATE_WARNING;fi

case "$1" in
        --help) print_help; exit $STATE_OK;;
        -h) print_help; exit $STATE_OK;;
        *) if [  $# -lt 2 ]; then print_help; exit $STATE_WARNING;fi ;;
esac

RAM_WARN=$1
RAM_CRIT=$2
[ $DEBUG -gt 0 ] && echo "Warning and Critical percentages are $RAM_WARN and $RAM_CRIT." >> $DEBUGFILE

if [ $RAM_WARN -le RAM_CRIT ]
then
        echo "Warning percentage should be larger than critical percentage."
        exit $STATE_WARNING
fi

check_space()
{
[ $DEBUG -gt 0 ] && echo "Starting check_space." >> $DEBUGFILE
        TOTALSPACE=0
        TOTALSPACE=`prtconf | grep ^"Memory size" | awk '{print $3}'`
[ $DEBUG -gt 0 ] && echo "Total space is $TOTALSPACE." >> $DEBUGFILE

        TOTALFREE=0
        TOTALFREE=`vmstat 2 2 | tail -1 | awk '{print $5}'`
[ $DEBUG -gt 0 ] && echo "Free space is $TOTALFREE." >> $DEBUGFILE
        let TOTALFREE=$TOTALFREE/1000
[ $DEBUG -gt 0 ] && echo "Free space, div1000 is $TOTALFREE." >> $DEBUGFILE
}

check_percentile() 
{
[ $DEBUG -gt 0 ] && echo "Starting check_percentile." >> $DEBUGFILE
        FRACTION=`echo "scale=2; $TOTALFREE/$TOTALSPACE" | bc`
[ $DEBUG -gt 0 ] && echo "Fraction is $FRACTION." >> $DEBUGFILE

        PERCENT=`echo "scale=2; $FRACTION*100" | bc | awk -F. '{print $1}'`
[ $DEBUG -gt 0 ] && echo "Percentile is $PERCENT." >> $DEBUGFILE

        if [ $PERCENT -lt $RAM_CRIT ]; then
[ $DEBUG -gt 0 ] && echo "$PERCENT is smaller than $RAM_CRIT. Critical." >> $DEBUGFILE
          echo "RAM NOK - Less than $RAM_CRIT % of physical RAM is unused."
          exitstatus=$STATE_CRITICAL
          exit $exitstatus
        fi

        if [ $PERCENT -lt $RAM_WARN ]; then
[ $DEBUG -gt 0 ] && echo "$PERCENT is smaller than $RAM_WARN. Warning." >> $DEBUGFILE
          echo "RAM NOK - Less than $RAM_WARN % of physical RAM is unused."
          exitstatus=$STATE_WARNING
          exit $exitstatus
        fi
}

check_space
check_percentile

[ $DEBUG -gt 0 ] && echo "$PERCENT is greater than $RAM_WARN. OK." >> $DEBUGFILE
echo "RAM OK - $TOTALFREE MB out of $TOTALSPACE MB RAM unused."
exitstatus=$STATE_OK
exit $exitstatus

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