Load Monitoring Script For Linux #1

#!/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="4.0"

# admin user email id

EMAIL="yourmail@mail.com"

# Subject for email

SUBJECT="Alert $(hostname) Load Average Exceeded The Limit"

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

# 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)"

#Save the current running processes in a file

/bin/ps -auxf >> /root/ps_output

# 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

echo "Load Average :" >> $TEMPFILE

echo -e "\n" >> $TEMPFILE

echo "$(top -n 1 -b|head -20)" >> $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