#!/bin/bash

# 

# Script to notify admin user if Linux,FreeBSD load crossed certain limit

# It will send an email notification to admin.

# This is free script under GNU GPL version 2.0 or above. 

# Support/FeedBack/comment :  http://cyberciti.biz/fb/

# Tested os: 

# * RedHat Linux

# * Debain Linux

# * FreeBSD





# Set up limit below

NOTIFY="6.0"



# admin user email id

EMAIL="root"



# Subject for email

SUBJECT="Alert $(hostname) load average"



# -----------------------------------------------------------------



# Os Specifc tweaks do not change anything below ;)

OS="$(uname)"

TRUE="1"

if [ "$OS" == "FreeBSD" ]; then

        TEMPFILE="$(mktemp /tmp/$(basename $0).tmp.XXX)"

	FTEXT='load averages:'

elif [ "$OS" == "Linux" ]; then

        TEMPFILE="$(mktemp)"

	FTEXT='load average:'

fi





# get first 5 min load

F5M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f1)"

# 10 min

F10M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f2)"

# 15 min

F15M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f3)"



# mail message

# keep it short coz we may send it to page or as an short message (SMS)

echo "Load average Crossed allowed limit $NOTIFY." >> $TEMPFILE

echo "Hostname: $(hostname)" >> $TEMPFILE

echo "Local Date & Time : $(date)" >> $TEMPFILE



# Look if it crossed limit

# compare it with last 15 min load average

RESULT=$(echo "$F15M > $NOTIFY" | bc)



# if so send an email

if [ "$RESULT" == "$TRUE" ]; then

        mail -s "$SUBJECT" "$EMAIL" < $TEMPFILE

fi



# remove file 

rm -f $TEMPFILE