Script for getting alert when the partition is full

arooooon · 01-12-2010, 04:33 PM

Hi Techies..

Is it possible to write a script for getting an automatic alert when a particular partition is full ?

Should we use crontab for this ?

Is any template is available in net for above scenario ? If so, pls give me the URL.

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ARUN

SaintDanBert · 01-12-2010, 05:48 PM

Quote:

Originally Posted by arooooon

[SIZE=4]
Is it possible to write a script for getting an automatic alert when a particular partition is full ?

Decide what you want from the script.
==>yes/no, true/false, error/success ... the partition is full

==> NNN % ... the partition is some percentage full

... or something else.

Use the df OPTION FILESYSTEM command to get a report on "free disk space" to standard output. Here is a script fragment:

Code:

user@host:$/Prj$ df -h /var
Filesystem Size Used Avail Use% Mounted on 
/dev/sda8  9.2G 877M 7.9G   10% /var

user@host:~/Prj$ foo=$(df -h /var)
user@host:~/Prj$ echo $foo
Filesystem Size Used Avail Use% Mounted on /dev/sda8 9.2G 877M 7.9G 10% /var
user@host:~/Prj$

The value of variable foo contains two records as one string.
The first record is column titles. The second record is the data.
Next write your code to parse the string for the numbers you want.

Once you have a running script to ask your question, embed this script into another script to (1) ask your question, and (2) report however you want to report.

Good luck,
~~~ 0;-Dan

arooooon · 01-13-2010, 11:42 AM

Hi Dan,

I'm able to understand somewhat, as i'm just started learning about scripts...plz give me any link for learning about scripts from the scratch and thank you very much for your reply

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ARUN

unSpawn · 01-13-2010, 11:57 AM

http://www.tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html
http://www.tldp.org/LDP/Bash-Beginne...tml/index.html
http://www.tldp.org/LDP/abs/html/ <- save this one for last, OK?

infinitiguy · 01-14-2010, 01:40 PM

Arun,
let me know how you get on with the script. I wrote a script a while back that does this, although it lacks some intelligence. i.e. it'll mail you on every cronrun until you fix the disk space issue.

if you get stuck, I may be able to help.
Cheers,
-Derek

arooooon · 01-15-2010, 12:22 AM

Sure Derek,i'll ..thanks

SaintDanBert · 01-16-2010, 03:33 AM

Quote:

Originally Posted by infinitiguy

...
I wrote a script a while back that does this, although it lacks some intelligence.
...

Perhaps you could post your script for all to see...?

NOTE to readers:
If 'infinityguy' posts a script remember that any critique might best apply to the code and not the coder. We are all learning something.
He gets two gold stars for free: (1) writing the script, (2)posting it for the lions and other beasties to chew on.

~~~ 0;-Dan

unSpawn · 01-16-2010, 05:15 AM

Without pretty printing, checking for empty emails or repeated warnings a /etc/cron.hourly entry for local storage could be as simple as

Code:

THRESH=75; /bin/df -mh | awk '/\/dev\/[h,s]d/ {print $1, $5, $6}' | while read partition percentage mountpoint; do [ ${percentage//\%/} -ge $THRESH ] && echo "$mountpoint $percentage"; done | mail -s "Storage warning for ${HOSTNAME}" rec@pi.ent

infinitiguy · 01-17-2010, 08:58 AM

Quote:

Originally Posted by SaintDanBert

Perhaps you could post your script for all to see...?

NOTE to readers:
If 'infinityguy' posts a script remember that any critique might best apply to the code and not the coder. We are all learning something.
He gets two gold stars for free: (1) writing the script, (2)posting it for the lions and other beasties to chew on.

~~~ 0;-Dan

#!/usr/local/bin/bash
#This defines the disk useage for said partition (i.e. it's checking /'s useage, and stripping out everything but the integer

root=`df -F ext3 -k | grep -vE '^Filesystem|tmpfs|cdrom' | grep /dev/sda3 | awk '{ print $5}' | cut -d'%' -f1`

#defines the partiion name we're alerting on
partition=/
#sets threshold
if [ $root -ge 90 ]; then
#emails alert
echo "Running out of space \"$partition ($root%)\" on $(hostname) as on $(date)" |
mail -s "Alert: Almost out of disk space on $(hostname). $partition is at $root%" dmurphy@domain.com
fi
exit 0

Here we go. It's really just a single command and then an if statement.
This was when I first started scripting

Hope it helps someone.