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#!/usr/bin/env perl
# Parameters supported:
#
# config
# autoconf
#
# Magic markers:
#%# family=auto
#%# capabilities=autoconf
use strict;
use warnings;
use LWP;
use JSON qw/decode_json/;
=head1 NAME
elasticsearch_open_files - A munin plugin that collects the number of open files in your elasticsearch instances
=head1 APPLICABLE SYSTEMS
Elasticsearch
=head1 CONFIGURATION
None
=head1 BUGS
None known so far. If you find any, let me know.
=head1 AUTHOR
Kentaro Yoshida - https://github.com/y-ken
=cut
my $host = exists $ENV{'host'} ? $ENV{'host'} : 'localhost';
my $port = exists $ENV{'port'} ? $ENV{'port'} : 9200;
my $ua = LWP::UserAgent->new;
$ua->timeout(10);
sub get_json_from_url {
my $uri = shift;
my $res = $ua->get($uri, 'Content-Type' => 'application/json' );
Carp::confess($res->code . " for " . $uri) unless $res->is_success;
my $data = do { local $@; eval { decode_json($res->content) } };
die("Could not decode JSON from: " . $res->content) unless $data;
return $data;
}
sub collect_max_file_descriptors {
my $data = get_json_from_url("http://$host:$port/_nodes/_local/stats/process");
foreach my $full_node_name (keys %{$data->{nodes}}) {
return $data->{nodes}{$full_node_name}{process}{max_file_descriptors};
}
}
sub collect_open_file_descriptors {
my $data = get_json_from_url("http://$host:$port/_nodes/_local/stats/process");
foreach my $full_node_name (keys %{$data->{nodes}}) {
return $data->{nodes}{$full_node_name}{process}{open_file_descriptors};
}
}
my %out = (
max_file_descriptors => collect_max_file_descriptors,
open_file_descriptors => collect_open_file_descriptors
);
if ($ARGV[0] and $ARGV[0] eq 'config') {
print "graph_title Elasticsearch open files\n";
print "graph_args --base 1000 -l 0\n";
print "graph_vlabel number of open files\n";
print "graph_category elasticsearch\n";
print "open_file_descriptors.label open files\n";
print "open_file_descriptors.type GAUGE\n";
print "open_file_descriptors.info The number of currently open files.\n";
print "max_file_descriptors.label max open files\n";
print "max_file_descriptors.type GAUGE\n";
}
elsif (!$ARGV[0] || $ARGV[0] eq 'autoconf') {
print "max_file_descriptors.value $out{max_file_descriptors}\n";
print "open_file_descriptors.value $out{open_file_descriptors}\n";
}
exit(0);
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