check_load

#! /usr/bin/env bash

#The following plugin checks and reports the load average of the system. The warning and critical thresholds are accepted as percentage values.

usage() { echo "Usage: $0 -c Critical -w Warning (% values, w<c)" 1>&2; exit 1; }

while getopts ":c:w:" o; do
    case "${o}" in
        c)
            c=${OPTARG}
            ;;
        w)
            w=${OPTARG}
            ;;
        *)
            usage
            ;;
    esac
done
#! [[ "$w" =~ ^[0-9]+$ ]] 
if [ -z "${c}" ] || [ -z "${w}" ] || [ $(echo "$w > $c" | bc) -ne 0 ]; then
    usage
fi

w=${w%.*}
c=${c%.*}
cpu=$(lscpu|grep CPU\(s\)|head -1|awk -F ':' '{print $2}')

#Half of w1/w
w15=$((w*cpu))
w15=$(echo "scale=3; $w15/200" | bc -l)

w1=$((w*cpu))
w1=$(echo "scale=3; $w1/100" | bc -l)

#Mean of w1 and w15
w5=$(echo $w1 + $w15| bc)
w5=$(echo "scale=3; $w5/2" | bc -l)

c15=$w1

c1=$((c*cpu))
c1=$(echo "scale=3; $c1/100" | bc -l)

#Mean of c1 and c15
c5=$(echo $c1 + $c15| bc)
c5=$(echo "scale=3; $c5/2" | bc -l)

load=$(uptime|awk -F ':' '{print $NF}')
IFS=',' read -ra addr <<< "$load"

#Load average for last 1,5 and 15 mins respectively
d1=${addr[0]}
d5=${addr[1]}
d15=${addr[2]}

echo "Load Average: $d1,$d5,$d15 (1,5,15 mins)"
echo "Warning Limit: $w1,$w5,$w15"
echo "Critical Limit: $c1,$c5,$c15"

#Reports critical/warning if either of the values get exceed (d1,d5,d15)
if [ $(echo "$d1 > $c1" | bc) -ne 0 ] || [ $(echo "$d5 > $c5" | bc) -ne 0 ] || [ $(echo "$d15 > $c15" | bc) -ne 0  ]; then
	exit 2
elif [ $(echo "$d1 > $w1" | bc) -ne 0 ] || [ $(echo "$d5 > $w5" | bc) -ne 0 ] || [ $(echo "$d15 > $w15" | bc) -ne 0 ]; then
	exit 1
fi