pfSense - Temperature Alert Script

cpu_temp_alert.sh

#!/bin/sh

#==================================================================
#title           :cpu_temp_alert.sh
#description     :This script will find the average temperature of
#                 the CPU and fire off an email if this temperature
#                 is over a set limit ($alert).
#author          :Justin Maciak
#date            :20160725
#version         :1.0
#usage           :./cpu_temp_alert.sh
#==================================================================

#Change the following number to the temperature you'd like to be alerted at
alert=55

#Get number of CPU cores
ncpu=$( sysctl hw.ncpu | awk '{ print $2 }' )

#Set hostname
thishost=$(hostname)

#Get temperature
get_temp() {
        avg=0

        for c in `jot ${ncpu} 0`; do
            temp=$( sysctl dev.cpu.${c}.temperature | sed -e 's|.*: \([0-9.]*\)C|\1|' )
            avg=$( echo "${avg} + ${temp}" | bc )
        done

        avg=$( echo "${avg} / (${ncpu})" | bc )
}

get_temp

#Compare current average temperature to alert threshold, email if equal or over
if [ "$avg" -gt "$alert" ]; then
        echo "WARNING: ${thishost} is currently at ${avg}C, which is over the alert threshold of ${alert}C" | /usr/local/bin/php -q /usr/local/bin/mail.php -s"ALERT: ${thishost} Temperature At ${avg}C"
        exit 1;
fi

exit 0