collectd redis metrics in ruby

collectd-redis.conf

LoadPlugin exec

<Plugin exec>
	Exec "nobody:nogroup" "/path/to/collectd-redis.rb" "127.0.0.1" "6379"
</Plugin>

collectd-redis.rb

#!/usr/bin/env ruby

require 'redis'
require 'socket'

# See: http://www.collectd.org/documentation/manpages/collectd-exec.5.shtml
hostname = ENV['COLLECTD_HOSTNAME'] || Socket.gethostname
interval = ENV['COLLECTD_INTERVAL'] || 60

host = ARGV.shift
port = ARGV.shift
redis = Redis.new(:host => host, :port => port)

while sleep(interval) do
  mem = redis.info['used_memory']

  puts "PUTVAL #{hostname}/exec-redis/memory-redis0 interval=#{interval} N:#{mem}"
end