[Shell Script] check physical memory monitoring shell script

in #kr-dev7 years ago (edited)

Check physical memory using shell script.

Memory is displayed as a percentage.
Quick and easy to implement, does not require any additional packages.

Usage: check_mem [-w|--warning] [-c|--critical]



example:

check_mem -w 10 -c 5

Gives WARNING on 10% free phsical memory and CRITICAL on 5% free memory

#!/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=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_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 $2-$3}'`
# normal values
#echo "$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
Sort:  

우와~ 스크립트 대단합니다. 뒤에 파라미터로 워닝인지 크리티컬인지 판단할 수 있군요.

네 저도 요즘 많이 배우고 있는 입장입니다. 좋게 봐주셔서 고맙습니다.

Cheer Up!

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Goooooood~~~

shell script 대학교때 많이 썼었는데, 잘 안쓰게 되더라고요.
perl, python 이 나오면서 차라리 이걸 쓰게 되더라고요...

네 맞습니다. 좀 복잡한 코딩을 해야하는 것들은 kdj님처럼 perl이나 tcl, python으로 코딩을 하는게 오히려 더 편할 수 있겠습니다. 하지만 쉘로 간단히 처리가능한 것들은 저는 아직까지는 쉘이 더 편하더라구요 업보팅 및 댓글 정말 감사드립니다.