Loading ...Perl script to monitor disk space and send an email
Here is a quick question by one of our regular reader :
How to write a perl script that can monitor my disk space under UNIX or Linux and send me an email alert?
There is a nice perl system routine called Perl df or Filesys::DiskSpace. This routine displays information on a file system such as its type, the amount of disk space occupied, the total disk space and the number of inodes etc.
Task: Install Filesys::DiskSpace
First you need to install this perl module using apt-get or from cpan (Comprehensive Perl Archive Network).
$ sudo apt-get install libfilesys-diskspace-perl
Perl script code to monitor disk space
Now write a perl script called df.pl:
$ vi df.pl
Append following code:
#!/usr/bin/perl use strict; use warnings; use Filesys::DiskSpace; # file system /home or /dev/sda5 my $dir = "/home"; # get data for /home fs my ($fs_type, $fs_desc, $used, $avail, $fused, $favail) = df $dir; # calculate free space in % my $df_free = (($avail) / ($avail+$used)) * 100.0; # display message my $out = sprintf("Disk space on $dir == %0.2f\n",$df_free); print $out;
Save and close the file. Run this script as follows:
$ chmod +x df.pl
$ ./df.pl
Output:
Disk space on /home == 75.35
So /home has 75.35% free disk space. Next logical step is to compare this number to limit so that you can send an email if only 10% free disk space is left on /home file system. Here is the code with
#!/usr/bin/perl use strict; use warnings; use Filesys::DiskSpace; my $dir = "/home"; # warning level 10% my $warning_level=10; my ($fs_type, $fs_desc, $used, $avail, $fused, $favail) = df $dir; my $df_free = (($avail) / ($avail+$used)) * 100.0; # compare free disk space with warning level if ($df_free < $warning_level) { my $out = sprintf("Send an Email - Disk space on $dir => %0.2f%% (WARNING Low Disk Space)\n",$df_free); print $out; } else { my $out = sprintf("Disk space on $dir => %0.2f%% (OK)\n",$df_free); print $out; }
Run script as follows:
$ ./df.pl
Output:
Send an Email - Disk space on /home => 3.99% (WARNING Low Disk Space)
Here is final code that send an email alert ( download):
#!/usr/bin/perl # Available under BSD License. See url for more info: # http://www.cyberciti.biz/tips/howto-write-perl-script-to-monitor-disk-space.html use strict; use warnings; use Filesys::DiskSpace; # file system to monitor my $dir = "/home"; # warning level my $warning_level=10; # email setup my $to='admin@yourdomain.com'; my $from='webmaster@YOURDOMAIN.COM'; my $subject='Low Disk Space'; # get df my ($fs_type, $fs_desc, $used, $avail, $fused, $favail) = df $dir; # calculate my $df_free = (($avail) / ($avail+$used)) * 100.0; # compare if ($df_free < $warning_level) { my $out = sprintf("WARNING Low Disk Space on $dir : %0.2f%% ()\n",$df_free); # send email using UNIX/Linux sendmail open(MAIL, "|/usr/sbin/sendmail -t"); ## Mail Header print MAIL "To: $to\\n"; print MAIL "From: $from\\n"; print MAIL "Subject: $subject\\n"; ## Mail Body print MAIL $out; close(MAIL); }
You can run this script as a cron job:
@hourly /path/to/df.pl
Recommended readings
=> Read man page of this module by typing following command:
$ man filesys::diskspace
=> CPAN filesys::diskspace webpage
=> Sending mail with Perl mail script and How do I send html email from Perl?
=> Shell script to monitor or watch the disk space
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Tags: comprehensive perl archive network, cpan, email, Filesys::DiskSpace, free disk space, perl archive network, perl df, perl script, pl, script code, sprintf, system routine, use strict, usr bin ~ Last updated on: May 5, 2008
Nice script.
I though had to change the sendmail part to:
## Mail Header
print MAIL “To: $to\n”;
print MAIL “From: $from\n”;
print MAIL “Subject: $subject\n”;
to get sendmail working correctly.
Thomas,
Opps stupid xhtml was causing problem. Post has been updated
Appreciate your post.
No prb. Nothing beats a good script ;ø)
You could also you Monit [1] to monitor disk space and several other services/daemons.
[1] http://www.tildeslash.com/monit/
IMHO, it would be better to implement a server monitoring system, which will also allow monitoring of other metrics, such as CPU utilisation, memory use, network port counts, log messages, network traffic, network checks, and more.
I use hobbit for this, which supports all of this out-the-box, and with no configuration required to have the memory, cpu utilisation, disk usage graphs working.
Although your perl script is nice, you could do it with a standard shell script as well:
for fs in `df -k|awk ‘{print $1}’|sed -n “2,14 p”`; do
x=”`df -kl | grep $fs | awk ‘{ print $5 }’| sed -e ’s/%//’`”
y=”75″
if [ $fs != "kernfs" ]; then
if [ $fs != "procfs" ]; then
if [ "${x}" -gt "${y}" ]; then
message=”File System `df -k |grep $fs |a
wk ‘{print $6\”,\”$5}’` Full”
echo $message | mail -s “`hostname` - Fi
le System Full Warning” root
fi
fi
fi
done
@Markus / Buchan
I do agree with all of you monit is much better but one of our loyal and regular reader wanted perl script.
@Pete
Thanks for a shell script.
Appreciate all of your posts.
[...] Para monitorar o espaço em disco de uma máquina, existe uma ótima rotina Perl chamada Perl df ou Filesys::DiskSpace. Esta rotina apresenta informações de um sistema de arquivos, como seu tipo, o quanto de disco está sendo usado e livre, o número de inodes, etc. Este artigo, disponibilizado pelo cyberciti.biz, demonstra a criação de um script Perl para monitorar o espaço em disco de servidores… [ link ] Converter em pdf. [...]
hi, can you please help me to write a perl script to read emails?
I am installing the Filesys::diskspace module and when I do make test I get the error as
———————————————-
t/linux-ext2…..Can’t use an undefined variable as ARRAY reference at t/linux-ext2.t line26
——————————————–
Anyone has encountered this problem previously..can you please tell me what the problem is
I get this error
“Cannot use df on this machine (untested or unsupported). ”
everything installed (moudles etc..)
can some one help me?
thank you!
I get “statfs failed on /home (new filesystem type?) .. ” error. Any idea?
Thanks!
I am getting an error “An error occured. statvfs failed. Did you run h2ph?” Any idea?
How we can make tests that we don’t send multiple e-mails? I’ve done that in shell scripts by setting up /tmp/mail_sent file and checking if it exists. After I logged onto a machine and free up some disk, I would remove the lock file.
My Perl is a bit rusty, so can anyone write the enhancement?
Well, for multiple e-mails, here it is:
## Mail Body
if (-e "/tmp/sms_sent")
{
print "already sent";
}
else
{
print MAIL $out;
system ("touch /tmp/sms_sent");
}