nagios监控内存

#script to check real memory usage # L.Gill 02/05/06 - V.1.0 # ------------------------------------------ # ########  Script Modifications  ########## # ------------------------------------------ # Who         When           What # ---    ----      ---- # LGill         17/05/06  "$percent" lt 1% fix - sed edits dc result beggining with "." # # #!/bin/bash USAGE="`basename $0` [-w|--warning]<percent free> [-c|--critical]<percent free>"THRESHOLD_USAGE="WARNING threshold must be greater than CRITICAL: `basename $0` $*"calc=/tmp/memcalc percent_free=/tmp/mempercent critical=""warning=""STATE_OK=0STATE_WARNING=1STATE_CRITICAL=2STATE_UNKNOWN=3# print usage if [[ $# -lt 4 ]] then         echo ""         echo "Wrong Syntax: `basename $0` $*"         echo ""         echo "Usage: $USAGE"         echo ""         exit 0 fi # read input while [[ $# -gt 0 ]]   do         case "$1" in                -w|--warning)                shift warning=$1         ;;                -c|--critical)                shift critical=$1         ;;         esac         shift   done # verify input if [[ $warning -eq $critical || $warning -lt $critical ]] then         echo ""         echo "$THRESHOLD_USAGE"         echo ""         echo "Usage: $USAGE"         echo ""         exit 0 fi # Total memory available total=`free -m | head -2 |tail -1 |gawk '{print $2}'` # Total memory used used=`free -m | head -2 |tail -1 |gawk '{print $3}'` # Calc total minus used free=`free -m | head -2 |tail -1 |gawk '{print $4+$7}'` # normal values #echo "$total"MB total #echo "$used"MB used #echo "$free"MB free # make it into % percent free = ((free mem / total mem) * 100) echo "5" > $calc # decimal accuracy echo "k" >> $calc # commit echo "100" >> $calc # multiply echo "$free" >> $calc # division integer echo "$total" >> $calc # division integer echo "/" >> $calc # division sign echo "*" >> $calc # multiplication sign echo "p" >> $calc # print percent=`/usr/bin/dc $calc|/bin/sed 's/^\./0./'|/usr/bin/tr "." " "|/usr/bin/gawk {'print $1'}` #percent1=`/usr/bin/dc $calc` #echo "$percent1" if [[ "$percent" -le  $critical ]]         then                 echo "CRITICAL - $free MB ($percent%) Free Memory"                 exit 2 fi if [[ "$percent" -le  $warning ]]         then                 echo "WARNING - $free MB ($percent%) Free Memory"                 exit 1 fi if [[ "$percent" -gt  $warning ]]         then                 echo "OK - $free MB ($percent%) Free Memory"                 exit 0 fi