passenger status for munin

passenger_status

#!/usr/bin/env ruby
# by Daniel Paulus | 27 - 10 - 2011
#
# put in /usr/share/munin/plugins/passenger_status
# chmod a+x /usr/share/munin/plugins/passenger_status
# ln -s /usr/share/munin/plugins/passenger_status /etc/munin/plugins/passenger_status
#
# add this to /etc/munin/plugin-conf.d/munin-node:
# [passenger_*]
# user root
# command ruby %c
#
# restart munin-node

def output_config
  puts <<-END
graph_category Passenger
graph_title passenger status
graph_vlabel count

sessions.label sessions
max.label max processes
running.label running processes
active.label active processes
END
  exit 0
end

def output_values
  status = `/home/rails/.rvm/gems/ree-1.8.7-2011.03/gems/passenger-3.0.7/bin/passenger-status`
  unless $?.success?
    $stderr.puts "failed executing passenger-status"
    exit 1
  end
  status =~ /max\s+=\s+(\d+)/
  puts "max.value #{$1}"

  status =~ /count\s+=\s+(\d+)/
  puts "running.value #{$1}"

  status =~ /active\s+=\s+(\d+)/
  puts "active.value #{$1}"

  total_sessions = 0
  status.scan(/Sessions: (\d+)/).flatten.each { |count| total_sessions += count.to_i }
  puts "sessions.value #{total_sessions}"
end

if ARGV[0] == "config"
  output_config
else
  output_values
end