check_elasticsearch.pl

#!/usr/bin/perl -T
# nagios: -epn
#
#  Author: Hari Sekhon
#  Date: 2013-06-03 21:43:25 +0100 (Mon, 03 Jun 2013) 
#
#  https://github.com/harisekhon/nagios-plugins
#
#  License: see accompanying LICENSE file
#

$DESCRIPTION = "Nagios Plugin to check a given Elasticsearch node

Checks:

- node is online and returning json with ok 200 status
- optionally check node is a member of the expected cluster
- optionally checks node's Elasticsearch / Lucene versions
- in verbose mode also prints out the generated Marvel node name

Tested on Elasticsearch 0.90.1, 1.2.1, 1.3.0, 1.4.0, 1.4.4, 1.4.5, 1.5.2, 1.6.2, 1.7.5, 2.0.2, 2.2.2, 2.3.3, 2.4.1, 5.0.0";

$VERSION = "0.3";

use strict;
use warnings;
BEGIN {
    use File::Basename;
    use lib dirname(__FILE__) . "/lib";
}
use HariSekhonUtils;
use HariSekhon::Elasticsearch;

$ua->agent("Hari Sekhon $progname version $main::VERSION");

my $cluster;
my $es_version_regex;
my $lc_version_regex;

%options = (
    %hostoptions,
    "C|cluster=s"       => [ \$cluster,           "Cluster to expect membership of (optional, available from 1.3" ],
    "es-version=s"      => [ \$es_version_regex,  "Elasticsearch version regex to expect (optional)" ],
    "lucene-version=s"  => [ \$lc_version_regex,  "Lucene version regex to expect (optional)" ],
);
splice @usage_order, 6, 0, qw/cluster es-version lucene-version/;

get_options();

$host = validate_host($host);
$port = validate_port($port);
$cluster = validate_elasticsearch_cluster($cluster) if $cluster;
$es_version_regex = validate_regex($es_version_regex, "elasticsearch version") if defined($es_version_regex);
$lc_version_regex = validate_regex($lc_version_regex, "lucene version") if defined($lc_version_regex);

vlog2;
set_timeout();

$status = "OK";

$json = curl_elasticsearch "/";

my $elasticsearch_status = get_field("status", "noquit");
if(defined($elasticsearch_status)){
    $msg .= "status: '$elasticsearch_status', ";
    check_string($elasticsearch_status, 200);
}
my $cluster_name = get_field("cluster_name", 1);
if($cluster_name){
    $msg .= "cluster: '$cluster_name', ";
    check_string($cluster_name, $cluster) if $cluster;
}
my $node_name = get_field("name", 1);
$msg .= "node name: '$node_name', " if($node_name and $verbose);

my $es_version = get_field2(get_field("version"), "number");
my $lc_version = get_field2(get_field("version"), "lucene_version");
isVersion($es_version) or quit "UNKNOWN", "invalid version returned for elasticsearch";
isVersion($lc_version) or quit "UNKNOWN", "invalid version returned for lucene";
$msg .= "elasticsearch version: $es_version";
check_regex($es_version, $es_version_regex) if $es_version_regex;
$msg .= ", lucene version: $lc_version";
check_regex($lc_version, $lc_version_regex) if $lc_version_regex;

vlog2;
quit $status, $msg;