[rabbitmq-discuss] Monitoring queue size via Nagios

[Tim Rosenblatt]

I was searching for a Nagios plugin to monitor RabbitMQ, and only found an
unanswered question to this mailing list of how it could be done.

I wanted to share the Ruby code I wrote for monitoring queue size. A next
step for monitoring is to connect directly to the queue with the Bunny gem
and make sure it is accepting connections.

#########

#!/usr/bin/ruby

VERSION_STRING = "Cloudspace RabbitMQ queue size checker v1.0 2009-10-20"


require 'optparse'

options = { :warning => 0, :critical => 0 }

OptionParser.new do |opts|
  opts.banner = "Usage #{__FILE__} [options]"

  opts.on("-?", "-h", "Help") do |v|
    puts "use --help for usage information"
    exit(3)
  end

  opts.on("--nagios", "Running from Nagios") do |v|
    options[:nagios] = true
  end

  opts.on("-v", "--verbose", "Run verbosely") do |v|
    options[:verbose] = v
  end

  opts.on("-V", "--version", "Prints \"#{VERSION_STRING}\"") do |v|
    puts VERSION_STRING
    exit(0)
  end

  opts.on("-w NUMBER", "--warning NUMBER", "Queue size for warning
threshold") do |n|
    options[:warning] = n.to_i
    puts "-w must be an integer greater than 0" or exit(3) unless
options[:warning] > 0
  end

  opts.on("-c NUMBER", "--critical NUMBER", "Queue size for critical
threshold") do |n|
    options[:critical] = n.to_i
    puts "-c must be an integer greater than 0" or exit(3) unless
options[:critical] > 0
  end

end.parse!(ARGV)


output = `sudo rabbitmqctl list_queues`
queue_sizes = output.scan(/\d+/)

puts output.gsub(/\n/, "")

queue_sizes.each do |q_size|
  q_size = q_size.to_i
  exit(2) if q_size > options[:critical]
  exit(1) if q_size > options[:warning]
end

exit(0)
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