Munin contributed plugins

#!/usr/bin/perl -w

#

## Copyright (C) 2009 Gleb Voronich <http://stanly.net.ua/>

##

## 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; version 2 dated June,

## 1991.

##

## 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, write to the Free Software

## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

##

##

## $Log$

##

## Based on Redis module code v0.08 2009/from http://svn.rot13.org/index.cgi/Redis

##

## Installation process:

##

## 1. Download the plugin to your plugins directory (e.g. /usr/share/munin/plugins)

## 2. Create 3 symlinks at the directory that us used by munin for plugins detection (e.g. /etc/munin/plugins): redis_connected_clients, redis_per_sec and and redis_used_memory

## 3. Edit plugin-conf.d/munin-node if it is needed (env.host and  env.port variables are accepted)

## 4. Restart munin-node service

use strict;

use IO::Socket::INET;

use Switch;

my $HOST = exists $ENV{'host'} ? $ENV{'host'} : "127.0.0.1";

my $PORT = exists $ENV{'port'} ? $ENV{'port'} : 6379;

my $server = "$HOST:$PORT";

my $sock = IO::Socket::INET->new(

	PeerAddr => $server,

	Proto => 'tcp'

);

print $sock "INFO\r\n";

my $result = <$sock> || die "can't read socket: $!";

my $rep;

read($sock, $rep, substr($result,1)) || die "can't read from socket: $!";

my $hash;

foreach (split(/\r\n/, $rep)) {

  my ($key,$val) = split(/:/, $_, 2);

  $hash->{$key} = $val;

}

close ($sock);

$0 =~ s/(.+)redis_//g;

switch ($0) {

    case "connected_clients" {

	if ( defined $ARGV[0] and $ARGV[0] eq "config" ) {

            print "graph_title Connected clients\n";

            print "graph_vlabel Connected clients\n";

            print "connected_clients.label connected clients\n";

            print "graph_category redis\n";

            exit 0;

	}

	print "connected_clients.value " . $hash->{'connected_clients'} . "\n";

    }

    case "per_sec" {

	if ( defined $ARGV[0] and $ARGV[0] eq "config" ) {

            print "graph_title Per second\n";

            print "graph_vlabel per \${graph_period}\n";

            print "graph_category redis\n";

            print "requests.label requests\n";

            print "requests.type COUNTER\n";

            print "connections.label connections\n";

            print "connections.type COUNTER\n";

            exit 0;

	}

	print "requests.value ". $hash->{'total_commands_processed'} ."\n";

	print "connections.value ". $hash->{'total_connections_received'} ."\n";

    }

    case "used_memory" {

	if ( defined $ARGV[0] and $ARGV[0] eq "config" ) {

            print "graph_title Used memory\n";

            print "graph_vlabel Used memory\n";

            print "used_memory.label used memory\n";

            print "graph_category redis\n";

            exit 0;

	}

	print "used_memory.value ". $hash->{'used_memory'}  ."\n";

    }

}