Munin contributed plugins

#!/usr/bin/env ruby

# thin_memory - A munin plugin for Linux to monitor memory size of each individual thin process

#

# For Linux ONLY !

# DOES NOT WORK on OSX, Solaris or BSD.

# only linux, because this script relies on proc filesystem

#

# Original author:

#   Frederico de Souza Araujo - fred.the.master@gmail.com

#   http://www.frederico-araujo.com

#

# Usurper:

#   Adam Michel - elfurbe@furbism.com

#   http://www.furbism.com

#

# Originally based on:

#   thin_process_memory -

#       A munin plugin to monitor memory size of

#       each individual thin process

#   by 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.

#

#

#%# family=auto

#%# capabilities=autoconf

module Munin

  class ThinProcessMemory

    # run main method

    def run

      instances = get_pids()

      instances.each do |instance|

        pid, port = instance.split("|")

        rss = (pid_rss(pid).to_i)/1024

        puts "thin_#{port}.value #{rss}"

      end

    end

    # only get the memory for each pid

    def pid_rss(pid)

      res = `grep "VmRSS" /proc/#{pid}/status`.split[1]

      if res.match("cannot access")

        return nil

      else

        return res

      end

    end

    # fetch all pids that match thin

    def get_pids

      pids = `pgrep -f 'thin' -l | awk -F " " '{ if (substr( $4, 10, 4)>=1) print $1"|"substr( $4, 10, 4)}' | sort -t'|' -nk 2`.split(/\r?\n/)

    end

    def autoconf

      get_pids().length > 0

    end

  end

end

mpm = Munin::ThinProcessMemory.new

case ARGV[0]

when "config"

  puts "graph_title Thin Memory"

  puts "graph_vlabel RSS"

  puts "graph_category webserver"

  puts "graph_args --base 1024 -l 0"

  puts "graph_scale yes"

  puts "graph_info Tracks the size of individual thin processes"

  mpm.get_pids.each do |instance|

    pid, port = instance.split("|")

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

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

    puts "thin_#{port}.type GAUGE"

    puts "thin_#{port}.min 0"

  end

when "autoconf"

  if mpm.autoconf

    puts "yes"

    exit 0

  end

  puts "no"

  exit 1

else

  mpm.run

end