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Disk Usage alert script

 
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sysconfig
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Joined: 12 Oct 2025
Posts: 12
PostPosted: Thu Oct 12, 2025 11:40 am    Post subject: Disk Usage alert script Reply with quote
Hi,


Intro
I am using /home/sysadmin/script/ folder for this script location.
/home/sysadm/script/tmp/ - For storing temporary file.

you need to initialize the value of some text file only first time like:

Quote:
# echo "0" > /home/sysadm/script/tmp/count


Now, set this script in your cron as mentioned below:

Quote:
*/15 * * * * /bin/sh /home/sysadm/script/alert.sh >> /dev/null 2>&1



Code:

Quote:
#!/bin/bash

stdout="/home/sysadm/script/tmp/disk.out" # for formated output
counterfile="/home/sysadm/script/tmp/count" # Couter file required to store variable value
hostnm=`hostname` # set hostname
reply="/home/sysadm/script/tmp/reply" # for formated output when problem is resolved

loop=`df -h | grep dev | wc -l` # get the no. of device

while [ 0 -lt "$loop" ] # loop for all mounted disk device
do
usage=`df -h |grep dev |sed -n "$loop s/%//p" | awk '{print $5}'` # stores the value of disk partion usage in it
devnm=`df -h |grep dev |sed -n "$loop s/%//p" | awk '{print $1}'` # stores the disk device partition name

if [ $usage -ge 90 ]; then # condition if values goes above 90% then send an alert email to System Administrator
############### Formated output redirect to file ########################
echo " " > $stdout
echo "Hi," >> $stdout
echo " " >> $stdout
echo "Presently the disk usage of the server $hostnm is using more than 90 % of its disk space. Check the below mentioned output:" >> $stdout
echo " " >> $stdout
echo " " >> $stdout
echo "`df -h`" >> $stdout
echo " " >> $stdout
echo "Please remove unwanted files/folders." >> $stdout
echo " " >> $stdout
echo "Disk device information is:" >> $stdout
echo " " >> $stdout
cat /proc/scsi/scsi >> $stdout
echo " " >> $stdout
echo "Thanks," >> $stdout
echo " " >> $stdout
#################################################################

counter=`cat $counterfile` # get the value of counter file so that it will not send repeated email

if [ $counter -eq 1 ]; then # condition to send email when value of counter file is one

mail -s "Alert: Disk Usage for `hostname` on `date` " [email protected] < $stdout # send an alert email
echo "2" >$counterfile # change the value in counter file
echo $devnm > $reply # get the device name in antoher file which is using more than 90% of disk space

fi
fi

if [ $devnm = `cat $reply` ] && [ "$usage" -lt 85 ]; then
# condition if sysadmin will work and clenup the disk space then sent email that disk space problem is resolved

############ Formated out put after the system admin will clean up space ##################
echo " " > $stdout
echo "Hi," >> $stdout
echo " " >> $stdout
echo "There was a high disk usage on the device $devnm, it seems that system admin has clean up the disk space as a precaution" >> $stdout
echo " " >> $stdout
echo " " >> $stdout
echo "`df -h`" >> $stdout
echo " " >> $stdout
echo "Thanks," >> $stdout
echo " " >> $stdout
echo "-Linux Sysadmin" >> $stdout
#################################################################

mail -s "Alert: Disk Usage is in control for `hostname` on `date`" [email protected] < $stdout
echo "nodev" > $reply # change the value in reply file if disk space is cleaned to avoid repeated email

fi

loop=`expr $loop - 1`
done

temp=`cat $counterfile`
counter=`expr $temp + 1`
echo $counter > $counterfile

###This will avoid repeated email when problem occur it will send email every 3 hour if you have set this script in cron for 15 mins

if [ $counter -eq 15 ]; then
echo "1" > $counterfile
fi

############# End Script #####################



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crouse
Site Admin


Joined: 17 Apr 2025
Posts: 8985
Location: Iowa
PostPosted: Thu Oct 12, 2025 7:09 pm    Post subject: Reply with quote
Interesting script.



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