gistfile1.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'xenapi'
require 'pp'

class Net::HTTP
  alias_method :old_initialize, :initialize
  def initialize(*args)
    old_initialize(*args)
    @ssl_context = OpenSSL::SSL::SSLContext.new
    @ssl_context.verify_mode = OpenSSL::SSL::VERIFY_NONE
  end
end

@config = YAML.load(File.read("/etc/secrets"))
REAL = 51_539_607_552 
crit = 95
warn = 85
critout = ''
warnout = ''
okout   = ''

servers = {
           'linbsd1' => nil,
           'linbsd2' => nil,
           'linbsd3' => nil,
           'linbsd4' => nil,
}

servers.keys.each do |s|
  total = 0
  client = XenApi::Client.new("https://#{s}:443")
  client.login_with_password('root', @config[s][:password])
  client.VM_metrics.get_all_records.each_pair { |k,v| total += v["memory_actual"].to_i }
  client.logout
  servers[s] = total
end

servers.each_pair do |k,v|
  used = (((REAL - v)/REAL.to_f) * 100).to_i
  if used  > crit
    critout << "\tCRIICAL: #{k} using #{used}% total memory"
  elsif used > warn
    warnout << "\tWARNING: #{k} using #{used}% total memory"
  else
    okout << "\tOK: #{k} using #{used}% total memory"
  end
end

critout = nil if critout.empty?
warnout = nil if warnout.empty?

if critout
  puts critout
  exit(1)
elsif warnout
  puts warnout
  exit(1)
else
  puts okout
  exit(0)
end