Nagios- Memory Check Plugin Rumi, January 6, 2013January 6, 2013 Dave the below code as check_mem.sh using nano and chmod it to +x. (file to be saved inside nagios libexec- such as /usr/local/nagios/libexec/check_mem.sh #!/bin/sh # Determine memory usage percentage on Linux servers. # Original write for RHEL3 for PC1 Project – jlightner 05-Jul-2005 # # Modified for RHEL5 on mailservers. # -Some of the escapes previously required for RHEL3's ksh not needed on RHEL5. # -Changed comparisons to allow for decimal rather than integer values. # jlightner 23-Jan-2009 # # Usage: check_mem.sh WARNING CRITICAL # Where WARNING and CRITICAL are the integer only portions of the # percentage for the level desired. # (i.e. 85% Warning & 95% Critical should be input only as "85 95".) # Define Levels based on input # WARNLEVEL=$1 CRITLEVEL=$2 # Setup standard Nagios/NRPE return codes # UNKNOWN_STATE=3 CRITICAL_STATE=2 WARNING_STATE=1 OK_STATE=0 # Give full paths to commands – Nagios can't determine location otherwise # BC=/usr/bin/bc GREP=/bin/grep AWK=/bin/awk FREE=/usr/bin/free TAIL=/usr/bin/tail HEAD=/usr/bin/head # Get memory information from the "free" command – output of top two lines # looks like: # total used free shared buffers cached # Mem: 8248768 6944444 1304324 0 246164 5647524 # The set command will get everything from the second line and put it into # posiional variables $1 through $7. # set `$FREE |$HEAD -2 |$TAIL -1` # Now give variable names to the positional variables we set above # MEMTOTAL=$2 MEMUSED=$3 MEMFREE=$4 MEMBUFFERS=$6 MEMCACHED=$7 # Do calculations based on what we got from free using the variables defined # REALMEMUSED=`echo $MEMUSED – $MEMBUFFERS – $MEMCACHED | $BC` USEPCT=`echo "scale=3; $REALMEMUSED / $MEMTOTAL * 100" |$BC -l` #USEPCT=`echo scale=3 "\n" $REALMEMUSED \/ $MEMTOTAL \* 100 |$BC -l |$AWK -F\. '{print $1}'` # Compare the Used percentage to the Warning and Critical levels input at # command line. Issue message and set return code as appropriate for each # level. Nagios web page will use these to determine alarm level and message. # #if [ `echo "5.0 > 5" |bc` -eq 1 ] #then echo it is greater #else echo it is not greater #fi if [ `echo "$USEPCT > $CRITLEVEL" |bc` -eq 1 ] then echo "CRITICAL – Memory usage is ${USEPCT}%" exit ${CRITICAL_STATE} elif [ `echo "$USEPCT > $WARNLEVEL" |bc` -eq 1 ] then echo "WARNING – Memory usage is ${USEPCT}%" exit ${WARNING_STATE} elif [ `echo "$USEPCT < $WARNLEVEL" |bc` -eq 1 ] then echo "OK – Memory usage is ${USEPCT}%" exit ${OK_STATE} else echo "Unable to determine memory usage." exit ${UNKNOWN_STATE} fi echo "Unable to determine memory usage." exit ${UNKNOWN_STATE} Then in nrpe.cfg or if you're using icinga place it in the command.cfg file on each host I have something like: # MEMORY Check # check_mem <WARN%> <CRIT%> = MEMORY at defined warning and critical use %. command[check_mem]=/usr/local/nagios/libexec/check_mem.sh 85 95 On your Nagios master you would then need to modify service.cfg to include something like: define service{ use generic-service host_name BILLYBOB service_description # Memory Use Pct contact_groups ux-admins, noc-op check_command check_nrpe!check_mem } Src: http://www.linuxquestions.org/questions/linux-software-2/nagios-check-ram-usage-on-remote-server-747531/ Related Administrations Configurations (Linux) Scripts icingaNagiosNRPE
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