elb-pinger.rb

#!/usr/bin/env ruby

require 'socket'
require 'net/https'
require "uri"

# Pings all addresses of an ELB every INTERVAL

interval = (ARGV[0] || 1).to_f
elb_name = ARGV[1]
host = ARGV[2] || elb_name

while true
  addrs = Socket.getaddrinfo(elb_name, nil).select{|e| e[0]["AF_INET"] }.map{|e| e[2]}.uniq
  addrs.sort.each do |addr|
    uri = URI.parse("https://#{addr}/")
    http = Net::HTTP.new(uri.host, uri.port)
    http.use_ssl = true
    http.verify_mode = OpenSSL::SSL::VERIFY_NONE
    headers = {"Host" => host}
    res = http.get(uri.path, headers)

    puts [Time.now.utc, "connected to #{addr}".ljust(29," "), res.code].join(" ")
  end

  sleep interval
end