#!/bin/bash
#
# Script to notify admin user if Linux,FreeBSD load crossed certain limit
# It will send an email notification to admin.
#
# Copyright 2005 (c) nixCraft project
# 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
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------

# Set up limit below
NOTIFY="6.0"

# admin user email id
EMAIL="root"

# Subject for email
SUBJECT="Alert $(hostname) 
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load average" # ----------------------------------------------------------------- # Os Specifc tweaks do not change anything below 😉 OS="$(uname)" TRUE="1" if [ "$OS" == "FreeBSD" ]; then
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TEMPFILE="$(mktemp /tmp/$(basename $0).tmp.XXX)" FTEXT='load
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averages:' elif [ "$OS" == "Linux" ]; then TEMPFILE="$(mktemp)" FTEXT='load average:' fi # get first 5 min load F5M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f1) | sed 's/ //g'" # 10 min F10M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f2) | sed 's/ //g'" # 15 min F15M="$(uptime | awk -F "$FTEXT" '{ print $2 }' | cut -d, -f3) | sed 's/ //g'" # 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