Shell - Script to Monitor Disk Usage

Linux Shell script to monitor disk usage.

==========================

On different system the script might need slight modification of positional parameters.

#!/bin/sh

# Shell script to monitor disk Usage

# Script name: diskmon.sh

# Usage: ./diskmon.sh

export logdir=/home/oracle/logs

export TIMESTAMP=`date +%T-%m-%d-%Y`

export logfile=$logdir/${TIMESTAMP}.log

{

   echo "HOSTNAME - $(hostname)"

   echo `date`

}>>$logfile

df -H | grep -vE '^Filesystem|tmpfs|cdrom|mapper|sda|media' | awk '{ print $3 " " $4 " " $5 " " $6 }' | while read result;

do

if [ $(echo $result | awk '{ print $3}') = '/' ]; then

{

   perc=$(echo $result | awk '{ print $2}' | cut -d'%' -f1  )

   mountp=$(echo $result | awk '{ print $3 }' )

}

else

{

   perc=$(echo $result | awk '{ print $3}' | cut -d'%' -f1  )

   mountp=$(echo $result | awk '{ print $4 }' )

}

fi

if [ $perc -ge 40 ]; then

{

   echo "Threshold limit reached  \"$mountp ($perc%)\" on $(hostname)"

}>>$logfile

fi

done

{

   echo "#######################################"

   echo "CURRENT MOUNT POINT INFORMATION"

   echo "#######################################"

   df -h

}>>$logfile

lines=`cat $logfile | wc -l | awk '{print $1}'`

if [[ $lines > 2 ]]; then

     /bin/mailx -s "Alert: Almost out of disk space on `hostname` " "abc@xmail.com" < $logfile

else

     rm $logfile

fi

Threshold value is set to 40 in above script to capture the output.

We will get result something like this.

[oracle@testing logs]$ cat 14\:15\:40-10-28-2016.log

HOSTNAME - testing.localdomain

Fri Oct 28 14:15:40 EDT 2016

Threshold limit reached  "/ (79%)" on testing.localdomain

Threshold limit reached  "/u02 (44%)" on testing.localdomain

#######################################

CURRENT MOUNT POINT INFORMATION

#######################################

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VolGroup00-LogVol00

                       11G  8.0G  2.2G  79% /

/dev/sda1              99M   13M   82M  13% /boot

tmpfs                 2.0G  636M  1.4G  33% /dev/shm

/dev/sdb1              30G   13G   16G  44% /u02

/dev/sdc1              30G  173M   28G   1% /u03

IBM_DB2               459G  253G  207G  56% /media/sf_IBM_DB2

Oracle_Setup          459G  253G  207G  56% /media/sf_Oracle_Setup

/dev/hda               56M   56M     0 100% /media/VBOXADDITIONS_5.1.0_108711