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add btrfs_subvol_usage plugin

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Plugin to monitor usage of subvolumes on a BTRFS filesystem.
This commit is contained in:
Alexander Knöbel 2016-06-04 14:48:42 +02:00
parent d42751c908
commit 11e4124ca8
1 changed files with 98 additions and 0 deletions
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plugins/disk/btrfs_subvol_usage Normal file
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#!/usr/bin/perl -w
=head1 NAME
btrfs_subvol_usage - Plugin to monitor usage of BTRFS subvolumes
=head1 CONFIGURATION
Must be run as root and you have to specify the path to the filesystem
[btrfs_usage]
user root
env.fsroot /path/to/btrfs/filesystem
=head1 MAGIC MARKERS
#%# family=auto
#%# capabilities=autoconf
=head1 USAGE
Link/Copy this plugin to /etc/munin/plugins/ and restart the munin-node.
=head1 AUTHOR
Alexander Knöbel <alex@belogy.de>
=head1 LICENSE
GPLv2
=cut
use strict;
use Munin::Plugin;
if ($ARGV[0] and $ARGV[0] eq 'autoconf') {
if (-e "/sbin/btrfs") {
print "yes\n";
} else {
print "no (/sbin/btrfs is missing)\n";
}
exit 0;
}
my @fsroot;
if ( !defined( $ENV{"fsroot"} ) ) {
die "No fsroot given! See the manual at top of this plugin file.";
}
@fsroot = $ENV{"fsroot"};
# get subvolumes
my %subvols;
open(SVS, "btrfs subvolume list --sort=path @fsroot |")
or die("Failed to run 'btrfs subvolume list': " . $!);
while (my $line = <SVS>) {
chomp $line;
$line =~ s/ID ([0-9]+) gen ([0-9]+) top level ([0-9]+) path (.+)//;
$subvols{$1}->{id} = $1;
$subvols{$1}->{name} = $4;
}
close SVS;
# get sizes from quota
open(QGS, "btrfs qgroup show @fsroot |")
or die("Failed to run 'btrfs qgroup show': " . $!);
while (my $line = <QGS>) {
chomp $line;
$line =~ s|([0-9]+)/([0-9]+)\s+([0-9]+)\s+([0-9]+)||;
if (defined($2) && defined($subvols{$2})) {
$subvols{$2}->{rfer} = $3;
$subvols{$2}->{excl} = $4;
}
}
close QGS;
# print config
if ($ARGV[0] and $ARGV[0] eq 'config') {
print "btrfs_usage\n";
print "graph_title BTRFS Subvolume usage\n";
print "graph_args --base 1024 --lower-limit 0\n";
print "graph_vlabel Bytes\n";
print "graph_category disk\n";
for my $id (sort { $subvols{$a}->{name} cmp $subvols{$b}->{name} } keys %subvols) {
print "$id.label " . $subvols{$id}->{name} . "\n";
print "$id.type GAUGE\n";
print "$id.draw LINE2\n";
}
exit 0;
}
# print usage
print "btrfs_subvol_usage\n";
for my $id (sort { $subvols{$a}->{name} cmp $subvols{$b}->{name} } keys %subvols) {
print "$id.value " . $subvols{$id}->{rfer} . "\n";
}