85 lines
2.0 KiB
Ruby
Executable File
85 lines
2.0 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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#
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# unicorn_status - A munin plugin for Linux to monitor unicorn processes
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#
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# Copyright (C) 2010 Shinji Furuya - shinji.furuya@gmail.com
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# Licensed under the MIT license:
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# http://www.opensource.org/licenses/mit-license.php
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#
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# set path to your rails app
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RAILS_ROOT = '/path/to/rails/app'.freeze
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# set name to your unicorn.pid
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PID_NAME = 'unicorn.pid'.freeze
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module Munin
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class UnicornStatus
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attr_reader :pid_file
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def initialize(rails_root, pid_name)
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@pid_file = "#{rails_root}/tmp/pids/#{pid_name}"
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end
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def master_pid
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File.read(pid_file).to_i
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end
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def worker_pids
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result = []
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ps_output = `ps w --ppid #{master_pid}`
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ps_output.split("\n").each do |line|
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chunks = line.strip.split(/\s+/, 5)
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pid = chunks[0]
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pcmd = chunks[4]
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next if pid !~ /\A\d+\z/ || pcmd !~ /worker/
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result << pid.to_i
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end
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result
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end
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def worker_count
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worker_pids.size
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end
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def idle_worker_count
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result = 0
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before_cpu = {}
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worker_pids.each do |pid|
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before_cpu[pid] = cpu_time(pid)
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end
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sleep 1
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after_cpu = {}
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worker_pids.each do |pid|
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after_cpu[pid] = cpu_time(pid)
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end
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worker_pids.each do |pid|
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result += 1 if after_cpu[pid] - before_cpu[pid] == 0
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end
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result
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end
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def cpu_time(pid)
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usr, sys = `cat /proc/#{pid}/stat | awk '{print $14,$15 }'`.strip.split(/\s+/).collect { |i| i.to_i }
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usr + sys
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end
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end
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end
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case ARGV[0]
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when 'autoconf'
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puts 'yes'
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when 'config'
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puts "graph_title Unicorn [#{File.basename(__FILE__).gsub(/^unicorn_status_/, '')}] - Status"
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puts 'graph_args -l 0'
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puts 'graph_vlabel number of workers'
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puts 'graph_category webserver'
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puts 'total_worker.label total_workers'
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puts 'idle_worker.label idle_workers'
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else
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m = Munin::UnicornStatus.new(ENV['rails_root'] || RAILS_ROOT, ENV['pid_name'] || PID_NAME)
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puts "total_worker.value #{m.worker_count}"
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puts "idle_worker.value #{m.idle_worker_count}"
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end
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