Shell Script : File System Usage Monitoring

File System Usage Monitoring Shell Script

File System Usage Monitoring Shell Script . This script is written using df command and it will send an email alert when your file system usage exceeds mentioned threshold.

Environment: Script will work in all the Unix / Linux environments. Tested in RHEL 5/6/7 and Centos All Versions

Warranty: This shell script does not have WARRANTY. Comes with an no warranty. Execution of this script in any of your environments, we are not responsible for any data loss.

Note: Please test the script before you deploy to the production Environment.

Prerequisites: Before executing the script please verify below commands are working and mail relay agent should work.

# df -hP
# awk
# mail -s "Testing Email" YOUREMAIL-ADDRESS

File System Usage Monitoring Shell Script

#!/bin/bash
################################################### File system monitoring 
###################################################
# This Script will send an Alert when Disk exceeds mentioned threshold.
# Author: Ravi Kumar
# Date: 26th Dec 2015
MAILADDRESS="aravikumar48@gmail.com"
# set usage alert VALUE
VALUE=90
# Hostname
HOSTNAME=$(hostname)
# Mail client
MAIL=/bin/mail
EMAIL=""
for line in $(df -hP | egrep '^/dev/' | awk '{ print $6 "_:_" $5 }')
do
part=$(echo "$line" | awk -F"_:_" '{ print $1 }')
part_usage=$(echo "$line" | awk -F"_:_" '{ print $2 }' | cut -d'%' -f1 )
if [ $part_usage -ge $VALUE -a -z "$EMAIL" ];
then
EMAIL="$HOSTNAME - $(date): Below File System is exceeding VALUE\n"
EMAIL="$EMAIL\n$part ($part_usage%) >= (VALUE = $VALUE%)"
elif [ $part_usage -ge $VALUE ];
then
EMAIL="$EMAIL\n$part ($part_usage%) >= (VALUE = $VALUE%)"
EMAIL="$EMAIL\n"
fi
done
if [ -n "$EMAIL" ];
then
echo -e "$EMAIL" | $MAIL -s "File System Usage Alert "$HOSTNAME" Need your Attention!" "$MAILADDRESS"
fi
## END Script ###

copy the above shell script code and do as mentioned below steps

#touch DfAlert.sh
#vi DfAlert.sh
Paste the shell script 
:wq <<-- Save & Exit

Set the execution permissions

#chmod +x DfAlert.sh

Execute the script as mentioned below

#sh DfAlert.sh

If your script execution is successful then schedule to execute the shell script every 5 minutes OR every 30 minutes.

Edit the crontab entries

#crontab -e
# File System Usage Monitoring Using Below Shell Script
*/5 * * * * sh /SCRIPT-PATH/DfAlert.sh
:wq   << -- Save & Exit

Verify the crontab entry

# crontab -l

That’s about this script. Script is successfully scheduled in your environment.