Munin contributed plugins

#!/usr/bin/env ruby

=begin

mongrel_process_memory - A munin plugin to monitor memory size of

                         each individual mongrel process

Copyright (C) 2007 Ben VandenBos and Avvo, Inc.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License version 2

as published by the Free Software Foundation.

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.,

51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

Author: Ben VandenBos

Contributors: Adam Jacob (<adam@hjksolutions.com>)

              Ryan Woodrum

#%# family=auto

#%# capabilities=autoconf

=end

module Munin

  class MongrelProcessMemory

    def run

      h = get_pids()

      ps_output = ""

      # I have no doubt that this is a terrible way of doing this.

      h.each do |k, v|

        ps_output = ps_output + `ps --no-heading l #{k}`

      end

      if ps_output

        port_list = Hash.new

        ps_output.each_line do |l|

          if l =~ /-p (\d+)/

            port = $1

            l_ary = l.split(/\s+/)

            if l_ary.length > 6

              port_list[port] = l_ary[7].to_i * 1024

            end

          end

        end

        port_list.sort.each do |port|

          puts "mongrel_#{port[0]}.value #{port[1]}"

        end

      end

    end

    def get_pids

      h = Hash.new

      pids = []

      pids = `pgrep mongrel_rails`

      pids.each { |p|

        l = `ps #{p}`

        l =~ /-p (\d+)/

        h[p] = $1

      }

      h

    end

    def autoconf

      pids.length > 0

    end

  end

end

mpm = Munin::MongrelProcessMemory.new

case ARGV[0]

when "config"

  puts "graph_title Mongrel Memory"

  puts "graph_vlabel RSS"

  puts "graph_category memory"

  puts "graph_args --base 1024 -l 0"

  puts "graph_scale yes"

  puts "graph_info Tracks the size of individual mongrel processes"

  mpm.get_pids.values.sort.each do |port|

    puts "mongrel_#{port}.label mongrel_#{port}"

    puts "mongrel_#{port}.info Process memory"

    puts "mongrel_#{port}.type GAUGE"

    puts "mongrel_#{port}.min 0"

  end

when "autoconf"

  if mpm.autoconf

    puts "yes"

    exit 0

  end

  puts "no"

  exit 0

else

  mpm.run

end