#!/usr/bin/perl -w # ## Copyright (C) 2009 Gleb Voronich ## ## 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; set env.password for password protected Redis server) ## 4. Restart munin-node service ## ## Magic Markers #%# family=auto #%# capabilities=autoconf suggest 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 $PASSWORD = exists $ENV{'password'} ? $ENV{'password'} : undef; my $sock = &get_conn(); my $config = ( defined $ARGV[0] and $ARGV[0] eq "config" ); my $autoconf = ( defined $ARGV[0] and $ARGV[0] eq "autoconf" ); if ( $autoconf ) { if ( defined( $sock ) ) { print "yes\n"; exit 0; } else { print "no (unable to connect to $HOST\[:$PORT\])\n"; exit 0; } } my $suggest = ( defined $ARGV[0] and $ARGV[0] eq "suggest" ); if ( $suggest ) { if ( defined( $sock ) ) { my @plugins = ('connected_clients', 'key_ratio', 'keys_per_sec', 'per_sec', 'used_keys', 'used_memory'); foreach my $plugin (@plugins) { print "$plugin\n"; } exit 0; } else { print "no (unable to connect to $HOST\[:$PORT\])\n"; exit 0; } } 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(/:/, $_, 2); if (defined($key)) { $hash->{$key} = $val; } } close ($sock); $0 =~ s/(.+)redis_//g; switch ($0) { case "connected_clients" { if ( $config ) { print "graph_title Connected clients\n"; print "graph_vlabel Connected clients\n"; print "graph_category redis\n"; print "graph_args -l 0\n"; print "connected_clients.label connected clients\n"; exit 0; } print "connected_clients.value " . $hash->{'connected_clients'} . "\n"; } case "keys_per_sec" { if ( $config ) { print "graph_title Keys Per Second\n"; print "graph_vlabel per \${graph_period}\n"; print "graph_category redis\n"; print "graph_args -l 0\n"; print "hits.label hits\n"; print "hits.type COUNTER\n"; print "misses.label misses\n"; print "misses.type COUNTER\n"; print "expired.label expirations\n"; print "expired.type COUNTER\n"; print "evictions.label evictions\n"; print "evictions.type COUNTER\n"; exit 0; } print "hits.value " . $hash->{'keyspace_hits'} . "\n"; print "misses.value " . $hash->{'keyspace_misses'} . "\n"; print "expired.value " . $hash->{'expired_keys'} . "\n"; print "evictions.value " . $hash->{'evicted_keys'} . "\n"; } case "key_ratio" { if ( $config ) { print "graph_title Key Hit vs Miss Ratio\n"; print "graph_vlabel per \${graph_period}\n"; print "graph_category redis\n"; print "graph_args -u 100 -l 0 -r --base 1000\n"; print "hitratio.label hit ratio\n"; print "hitratio.type GAUGE\n"; print "hitratio.draw AREA\n"; print "missratio.label miss ratio\n"; print "missratio.type GAUGE\n"; print "missratio.draw STACK\n"; exit 0; } my $total = $hash->{'keyspace_hits'} + $hash->{'keyspace_misses'}; my $hitratio = 0; my $missratio = 0; if ($total > 0) { $hitratio = $hash->{'keyspace_hits'} / $total * 100; $missratio = $hash->{'keyspace_misses'} / $total * 100; } printf("hitratio.value %.2f\n", $hitratio); printf("missratio.value %.2f\n", $missratio); } case "per_sec" { if ( $config ) { print "graph_title Per second\n"; print "graph_vlabel per \${graph_period}\n"; print "graph_category redis\n"; print "graph_args -l 0\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 ( $config ) { print "graph_title Used memory\n"; print "graph_vlabel Used memory\n"; print "graph_category redis\n"; print "graph_args -l 0 --base 1024\n"; print "used_memory.label used memory\n"; print "used_memory.draw AREA\n"; exit 0; } print "used_memory.value ". $hash->{'used_memory'} ."\n"; } case "used_keys" { my $dbs; foreach my $key (keys %{$hash}) { if ( $key =~ /^db\d+$/ && $hash->{$key} =~ /keys=(\d+),expires=(\d+)/ ) { $dbs->{$key} = [ $1, $2 ]; } } if ( $config ) { print "graph_title Used keys\n"; print "graph_vlabel Used keys\n"; print "graph_category redis\n"; print "graph_args -l 0\n"; foreach my $db (keys %{$dbs}) { printf "%s_keys.label %s keys\n", $db, $db; printf "%s_expires.label %s expires\n", $db, $db; } exit 0; } foreach my $db (keys %{$dbs}) { printf "%s_keys.value %d\n", $db, $dbs->{$db}[0]; printf "%s_expires.value %d\n", $db, $dbs->{$db}[1]; } } } sub get_conn { my $sock = IO::Socket::INET->new( PeerAddr => $HOST, PeerPort => $PORT, Timeout => 10, Proto => 'tcp' ); if ( defined( $PASSWORD ) ) { print $sock "AUTH ", $PASSWORD, "\r\n"; my $result = <$sock> || die "can't read socket: $!"; } return $sock; } # vim: ft=perl ai ts=4 sw=4 et: