Commit 71a95c59 authored by Luc Didry's avatar Luc Didry
Browse files

Ajout du plugin du

parents
#!/usr/bin/perl
# vim: set filetype=perl sw=4 tabstop=4 expandtab smartindent: #
=head1 NAME
du - Plugin to monitor multiple directories size
=head1 AUTHOR AND COPYRIGHT
Copyright 2011 Luc Didry <luc AT didry.org>
=head1 HOWTO CONFIGURE AND USE :
=over
=item - /etc/munin/plugin-conf.d/du_
[du]
user root
env.interval 20 # INTERVAL OF DU POLLING IN MINUTES
env.dirs /home/foo /home/bar # DIRECTORIES TO POLL
env.suppr /home/ # PLEASE USE \# INSTEAD OF #
timeout 900 # 15 MINUTES IN SECONDS
=item - /etc/munin/plugins-enabled
ln -svf ../plugins-available/site/du
=item - restart Munin node
sudo killall -TERM munin-node
=back
=head1 CREDITS
Based on the 'du_multidirs-v2' initially written in Bash by Christian Kujau <lists@nerdbynature.de> and modified by dano229.
This script was based on the 'homedirs' plugin, initially written in Perl by Philipp Gruber <pg@flupps.net>
=head1 MAGIC MARKERS
#%# family=auto
#%# capabilities=autoconf
=head1 LICENSE
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
=cut
use warnings;
use strict;
use Munin::Plugin;
use POSIX qw(setsid);
my $PLUGIN_NAME = "du";
my $CACHEFILE="$Munin::Plugin::pluginstatedir/du.cache";
my $TEMPFILE="$Munin::Plugin::pluginstatedir/du.tmp";
my $LOCKFILE="$Munin::Plugin::pluginstatedir/du.lock";
my $TIMEFILE="$Munin::Plugin::pluginstatedir/du.time";
##### autoconf
if( (defined $ARGV[0]) && ($ARGV[0] eq "autoconf") ) {
print "yes\n";
## Done !
munin_exit_done();
}
## In the parent, it's just a regular munin plugin which reads a file with the infos
##### config
if( (defined $ARGV[0]) && ($ARGV[0] eq "config") ) {
print "graph_title Directory usage\n";
print "graph_args --base 1024 -l 1\n";
print "graph_vlabel Bytes\n";
print "graph_category disk\n";
print "graph_total total\n";
print "graph_info This graph shows the size of several directories\n";
my $foo = 0;
open (FILE, "<", $CACHEFILE) or munin_exit_fail();
while(defined (my $bar = <FILE>)) {
if ($bar =~ m/(\d+)\s+(.+)/) {
my $dir = $2;
clean_path(\$dir);
print "$dir.label $dir\n";
if ($foo++) {
print "$dir.draw STACK\n";
} else {
print "$dir.draw AREA\n";
}
}
}
close(FILE);
## Done !
munin_exit_done();
}
##### fetch
open (FILE, "<", $CACHEFILE) or munin_exit_fail();
while(defined (my $foo = <FILE>)) {
if ($foo =~ m/(\d+)\s+(.+)/) {
my ($field, $value) = ($2, $1);
clean_path(\$field);
print $field, ".value ", $value, "\n";
}
}
close(FILE);
daemonize();
#
##
### PUBLIC FONCTIONS
###############################################################################
## Used to create the fork
sub daemonize {
chdir '/' or die "Can't chdir to /: $!";
defined(my $pid = fork) or die "Can't fork: $!";
munin_exit_done() if $pid;
open STDIN, '/dev/null' or die "Can't read /dev/null: $!";
open STDOUT, '>/dev/null' or die "Can't write to /dev/null: $!";
open STDERR, '>&STDOUT' or die "Can't dup stdout: $!";
setsid or die "Can't start a new session: $!";
## In the child, let's get the du infos if necessary
if (cache_is_too_old() && du_not_running()) {
my $dirs = $ENV{dirs};
system("touch $LOCKFILE; du -sb $dirs > $TEMPFILE; cat $TEMPFILE > $CACHEFILE; rm $LOCKFILE; date +%s > $TIMEFILE;");
}
exit;
} ## daemonize
## Used to remove the beginning of the paths if wanted
sub clean_path {
my ($path) = @_;
if (defined $ENV{suppr}) {
my $pattern = $ENV{suppr};
$$path =~ s#^($pattern)##;
}
} ## clean_path
## Do you really need I told you what this functions are going to check ?
sub cache_is_too_old {
return 1 if (! -e $TIMEFILE);
my ($time) = `cat $TIMEFILE`;
chomp $time;
return 1 if ( (time - $time) > ($ENV{interval}*60) );
return 0;
} ## cache_is_too_old
sub du_not_running {
return 0 if (-e $LOCKFILE);
return 1;
}
sub munin_exit_done {
__munin_exit(0);
} ## sub munin_exit_done
sub munin_exit_fail {
__munin_exit(1);
} ## sub munin_exit_fail
#
##
### INTERNALS FONCTIONS
###############################################################################
sub __munin_exit {
my $exitcode = shift;
exit($exitcode) if(defined $exitcode);
exit(1);
} ## sub __munin_exit
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