Shell Script Disk Usage Report and E-Mail Current Threshold Status

Shell Script - Disk Usage Report and E-Mail Current Threshold Status
Overview
The purpose of this script is to send notification of current disk space utilization and also to monitor disk
usage every 12 hours and find out disk usage difference in usage from last 12 hours in bytes for each
partition.
The script will generate disk space usage report and send notification to the recipients.
This report will help administrators whether the report has to be shared with appropriate application
owners to clean up disk(s).
Also when the threshold limit or 90% and above is reached, disk partition usage % is shade in “RED”,
signifying that it’s a “Critical Alert”.
Applies To
 Tested on CentOS 7
Pre-requisites
Bash
Shell Script – Snippet
Copy and paste the script into a file, change script permission and run it.
#!/bin/bash
#
# To debug uncomment the below line
#set -x
#
# Set Environment Variables
#
TODAY="at $(date '+%H:%M on %d-%b-%y')"
OutputFilename=$(date +"%b_%d_%Y".html)
LastReport=/tmp/LastReport.txt
NowReport=/tmp/NowReport.txt
CurDate=`date +%D %T %Z`
#
# Set Alert Type according to Percentage
#
CriticalPercentage=90
WarningPercentage=80
NormalPercentage=70

#
# Get IP Address set from hosts file
#
IPADDRESS=`head -n 1 /etc/hosts | awk ' { print $1 }'`
#
# Remove Output File, if it already exists
#
if [ -f /tmp/${OutputFilename} ]; then
rm -f /tmp/${OutputFilename}
fi
if [ -f ${NowReport} ]; then
mv ${NowReport} ${LastReport}
cp /dev/null ${NowReport}
fi
#
# Find out Difference Previous and Current Report for each partition
#
df -Pl | grep -vE "^Filesystem|tmpfs|cdrom" | awk 'NR>0 && NF==6' | awk '{print $3}' > ${NowReport}
if [ -f ${LastReport} ]; then
DiffValue=(`awk '{ getline getdifference < "/tmp/LastReport.txt"; $1 -= getdifference; print }'
/tmp/NowReport.txt`)
fi
#
# Defining HTML Table Format & Fields
#
(
echo '<HTML><HEAD><TITLE>Disk Usage Statistics</TITLE></HEAD>'
echo '<BODY>'
echo '<H3>Disk Usage Report for server - '$(uname -n) for ${IPADDRESS}'</H3>'
echo '<P>Report Generated '${TODAY}'</P>'
echo '<TABLE BORDER=3 CELLSPACING=2 CELLPADDING=0>'
echo '<TR BGCOLOR="#BBFFFF"> <TH>Filesystem</TH> <TH>Total</TH> <TH>Disk Used</TH>
<TH>Available</TH> <TH>Percentage Info</TH> <TH>Mounted On</TH> <TH>Critical Alert</TH>
<TH>Report Date</TH> <TH>12 Hrs Difference </TH><//TR>'

#
# Extract Disk Usage Information
# Suppress Listing of “FileSystem, tmpfs and cdrom” Information
#
ArryCount=0
df -Pl | grep -vE "^Filesystem|tmpfs|cdrom" | awk 'NR>0 && NF==6'|sort|while read FileSystem Size
DiskUsed DiskFree DiskPercentUsed MountPoint
do
PERCENT=${DiskPercentUsed%%%}
#
# Calculate the Difference between previous run and current run
#
TDiffValue=(`awk '{ getline getdifference < "/tmp/LastReport.txt"; $1 -= getdifference; print }'
/tmp/NowReport.txt`)
#
# Verify if disk usage is greater equal to than set threshold limit - 90%
#
if [[ ${PERCENT} -ge ${CriticalPercentage} ]];
then
COLOR=red
CRITICALALERT="Yes, Notify"
elif [ ${PERCENT} -ge ${WarningPercentage} ] && [ ${PERCENT} -le 80 ];
then
COLOR=orange
CRITICALALERT=No
else
COLOR=green
CRITICALALERT=NA
fi
echo '<TR><TD>'$FileSystem'</TD><TD ALIGN=RIGHT>'$Size'</TD>'
echo '<TD ALIGN=RIGHT>'$DiskUsed'</TD><TD ALIGN=RIGHT>'$DiskFree'</TD>'
echo '<TD><TABLE BORDER=0 CELLSPACING=3 CELLPADDING=0>'
echo '<TR><TD WIDTH='$((2 * $PERCENT))' BGCOLOR="'$COLOR'"></TD>'
echo '<TD WIDTH='$((2 * (100 - $PERCENT)))' BGCOLOR="gray"></TD>'
echo '<TD><FONT FONT-WEIGHT="bold" SIZE=-1
COLOR="'$COLOR'">'$DiskPercentUsed'</FONT></TD>'
echo '<TR></TABLE><TD>'$MountPoint'</TD>'
echo '<TD><FONT font-weight="bold">'$CRITICALALERT'</TD></FONT>'
echo '<TD><FONT font-weight="bold">'`date`'</TD></FONT>'
echo '<TD><FONT font-weight="bold">'${TDiffValue[ArryCount]} (in bytes)'</TD></FONT></TR>'
echo $DiskUsed >> `hostname`.usage.txt

ArryCount=$ArryCount+1
done
echo '</TABLE>'
echo '</P><BR>'
echo '<TABLE BORDER=1 CELLSPACING=3 CELLPADDING=0>'
echo '<TR><TH FONT font-weight="bold">Legend Information</TH></TR>'
echo '<TR><TD FONT color="white" BGCOLOR="RED">Critical Alert</TD></TR>'
echo '<TR><TD FONT color="white" BGCOLOR="ORANGE">Warning Alert</TD></TR>'
echo '<TR><TD FONT color="white" BGCOLOR="GREEN">No Action Alert</TD></TR>'
echo '</TABLE>'
echo '<BODY></HTML>'
echo '<P><FONT font-weight="bold">Report Generated by IT Team</P>'
) | tee `hostname`_${0##*/}.html
#
# Sending E-Mail Notification
#
(
echo To: ToRecipient.Account@domainname.com
echo From: FromRecipient.Account@domainname.com
echo "Content-Type: text/html; "
echo Subject: Disk Usage Report for server `hostname` 'for' $IPADDRESS
echo
cat `hostname`_${0##*/}.html
) | sendmail -t
echo -e "Report Generation is Completed... na"
Run Disk Usage Report – Shell Script
To run the script, ensure you change the file permission to “executable” and then run it;
chmod +x ./DiskUsageReport.sh
./DiskUsageReport.sh

Disk Usage E-Mail Report
A sample email report is shown below;

Shell Script Disk Usage Report and E-Mail Current Threshold Status

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