Nombre: checkMemory.sh
Autor: Cristian Hernandez
Descripcion: Monitorea el uso total de la memoria.
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#!/bin/bash
#===============================================================================
# Author:
# Cristian Hernandez
#===============================================================================
#
# Description:
# Monitor total memory usage.
#
# Parameters:
# -w: Warning threshold (in percentiles)
# -c: Critical threshold (in percentiles)
# -h: Help message
#
#===============================================================================
#
# FUNCTIONS:
#
#-------------------------------------------------------------------------------
# Check CPU activity. Returns OK, WARNING or CRITICAL status based on command
# line arguments
function check_memory() {
local warning=$1
local critical=$2
local results=($(free -m | awk 'BEGIN {
total=0;
rss=0
}
{
if ($1 == "Mem:") {
total=$2; # Memory total
vmz=$3; # Memory in use (VMZ)
}
if ($1 == "-/+") {
rss=$3 # Memory in use (RSS)
cache=vmz-$3; # Memory in cache
}
}
END {
# Return array of results: [percent_memory_used, memory_in_cache]
print int(rss/total*100), cache
}'))
echo "Current:${results[0]} Threshold:[${warning}/${critical}]% Cache:${results[1]}MB"
# Check status and exit accordingly
[ "${results[0]}" -gt "$critical" ] && exit 2
[ "${results[0]}" -gt "$warning" ] && exit 1
exit 0
}
#-------------------------------------------------------------------------------
# Help message
function usage() {
echo "Usage:
-w: Warning threshold (in percentiles, i.e. from 0 to 100)
-c: Critical threshold (in percentiles, i.e. from 0 to 100)
-h: This Help message
Example: $0 -w 70 -c 90"
}
#-------------------------------------------------------------------------------
#
# MAIN:
#
#-------------------------------------------------------------------------------
# Check command line options
while getopts 'c:w:h' OPT
do
case $OPT in
w) warning=${OPTARG}
;;
c) critical=${OPTARG}
;;
h) usage && exit 1
;;
esac
done
# Validate command line arguments
if [ $# -eq 4 ]; then
if [ "$critical" -gt "$warning" ]; then
# Check memory usage and exit accordingly
check_memory $warning $critical
else
echo "ERROR: critical threshold must be greater than warning threshold"
usage
exit 1
fi
else
echo "ERROR: Missing argument!"
usage
exit 1
fi
