check_varnish_hit

#!/bin/bash
# bash simple script to get the varnish 3 hit_ratio
# by Felipe Ferreira Mar/2014

# update 08/2016 - VARNISH 4.1


if [ $# -ne 2 ]; then
# set default hit_ratio thresholds
CRIT=90
WARN=95
else
CRIT=$1
WARN=$2
fi

T=`varnishstat -1 -f MAIN.client_req |awk '{print $2 }'`
M=`varnishstat -1 -f MAIN.cache_hit |awk '{print $2 }' `
#MAIN.cache_hit
#echo "Total  req: " $T
#echo "Total  hit: " $M
if [ -z $T ] || [ -z $M ]; then
 echo "UNKOWN - Could not get the varnish client_req or varnish_hit information from varnishstat cmd"
 exit 3
fi

R1=`perl -e "printf('%.2f',100*${M})"`
R3=`perl -e "printf('%.2f',${R1}/${T})"`
#R3=`perl -e "printf('%.2f',100-${R2})"`

MSG="${R3}% hit_ratio|hit_ratio=${R3}"
H=`perl -e "printf('%.0f',${R3})"`
#echo "DEBUG: $H $CRIT $WARN"

if [ "$H" -le "$CRIT" ]; then
    echo "CRITICAL - $MSG"
    exit 2
fi
if [ "$H" -le "$WARN" ]; then
    echo "WARNING - $MSG"
    exit 1
else
    echo "OK - $MSG"
    exit 0
fi