disk space check

myint45 · 01-23-2008, 06:18 PM

Hi,

I'm new to scripting so I'm trying to find a script that'll check disk space for let's say something above 65% usage. If that's the case then send me an e-mail.

And possibly go out and clean the dir.

Thanks in advance for any help you guys can give me.

L.M

unSpawn · 01-23-2008, 06:49 PM

This is just a generic idea.

Code:

#!/bin/sh --
# /etc/cron.hourly/diskusage.cron
# Error out
set -e
# Percentage threshold:
THRESH="75"
# E-mail recipient:
RECIPIENT="root@localhost"
# Tempfile location:
TEMPF="/dev/shm/diskusage.cron.$$"
# Make a report:
( /bin/df -mh 2>/dev/null | grep ^/ | while read partition size used available percentage mountpoint; do 
  [ ${percentage//\%/} -ge $THRESH ] && echo "$mountpoint full $percentage"; done | column -t ) > "$TEMPF"
# If it contains stuff send it off:
if [ -s "$TEMPF" ]; then 
 cat "$TEMPF" |  mail -s "${HOSTNAME} [WARN] (${THRESH}%)" $RECIPIENT
fi; rm -f "$TEMPF"
exit 0

Using something like Monit would make things more efficient since it's faster more versatile.
BTW I'd be against automagical deletion, unless it's a tempdir.
In that case you don't want a script but run "tmpwatch" instead.

* I've been lazy and used a temporary file for pretty printing instead of an array. Besides that this script doesn't handle exclusions which it should. Aww well.

ghostdog74 · 01-23-2008, 07:07 PM

Code:

df -k | awk 'int($5) > 95 { 
  subject = $1 " More than 95% disk usage "
  email = "email@test.com"
  cmd = "mailx -s \"" subject "\" " email
  cmd  | getline #or system(cmd)
  close(cmd)
  }
'

myint45 · 01-24-2008, 02:38 PM

Quote:

Originally Posted by ghostdog74

Code:

df -k | awk 'int($5) > 95 { 
  subject = $1 " More than 95% disk usage "
  email = "email@test.com"
  cmd = "mailx -s \"" subject "\" " email
  cmd  | getline #or system(cmd)
  close(cmd)
  }
'

df -k | awk 'int($5) > 95 === can I do df -mh and is int($5) going to make 45% just 45?

cmd | getline #or system(cmd) === what is this line doing?

myint45 · 01-24-2008, 02:40 PM

Quote:

Originally Posted by unSpawn

This is just a generic idea.

Code:

#!/bin/sh --
# /etc/cron.hourly/diskusage.cron
# Error out
set -e
# Percentage threshold:
THRESH="75"
# E-mail recipient:
RECIPIENT="root@localhost"
# Tempfile location:
TEMPF="/dev/shm/diskusage.cron.$$"
# Make a report:
( /bin/df -mh 2>/dev/null | grep ^/ | while read partition size used available percentage mountpoint; do 
  [ ${percentage//\%/} -ge $THRESH ] && echo "$mountpoint full $percentage"; done | column -t ) > "$TEMPF"
# If it contains stuff send it off:
if [ -s "$TEMPF" ]; then 
 cat "$TEMPF" |  mail -s "${HOSTNAME} [WARN] (${THRESH}%)" $RECIPIENT
fi; rm -f "$TEMPF"
exit 0

Using something like Monit would make things more efficient since it's faster more versatile.
BTW I'd be against automagical deletion, unless it's a tempdir.
In that case you don't want a script but run "tmpwatch" instead.

* I've been lazy and used a temporary file for pretty printing instead of an array. Besides that this script doesn't handle exclusions which it should. Aww well.

grep ^/ | while read partition size used available percentage mountpoint; == what's happening after the while statment?

chrism01 · 01-24-2008, 05:07 PM

He's using the while syntax:

Code:

while sometest
do  
    some stuff
done

in this case
do
check usage vs theshold, if thresh exceeded, output fact
done
pipe results through tab separators, redirect formatted result to tempfile

HTH