My vagrantfile for provisioning multiple boxes privately networked provisioned by puppet

Vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby sts=2 ts=2 expandtab sw=2:

Vagrant.configure("2") do |config|

  puppet_nodes = [  
    {
      :hostname => 'clusternode',
      :ip => '192.168.2.202',
      :ram => 1024
    },
    {
      :hostname => 'gfdomain',
      :ip => '192.168.2.50',
      :fwdports => [
        :guest => 4848, :host => 4848
      ],
      :ram => 1024
    }
  ]

  # craft a hosts file based on localhost plus the above nodes so that we can access our private network automatically
  $hosts = []
  puppet_nodes.each do |node|
    $hosts << node[:ip] + "    " + node[:hostname]
  end
  $overwrite_hosts_script = <<SCRIPT
echo "127.0.0.1 localhost">/etc/hosts
SCRIPT
  $hosts.each do |line|
    $overwrite_hosts_script += <<SCRIPT
echo "#{line}" >> /etc/hosts
SCRIPT
  end

  config.vm.box = "fedora-18-puppet"

  # for each puppet node, set it up and provision it via puppet with a manifest
  # corresponding to its hostname
  puppet_nodes.each do |node|
    config.vm.define node[:hostname] do |cfg|
      if node[:box] && node[:box_url]
        cfg.vm.box = node[:box]
        cfg.vm.box_url = node[:box_url]
      end
      cfg.vm.hostname = node[:hostname]
      cfg.vm.network :private_network, :ip => node[:ip]

      if node[:ram]
        cfg.vm.provider :virtualbox do |vb|
          vb.customize ["modifyvm", :id, "--memory", node[:ram] ]
        end
      end

      if node[:fwdports]
        node[:fwdports].each do |tuple|
          cfg.vm.network :forwarded_port, guest: tuple[:guest], host: tuple[:host]
        end
      end

      cfg.vm.provision :shell, :inline => $overwrite_hosts_script
      cfg.vm.provision :puppet do |puppet|
        puppet.manifests_path = "manifests"
        puppet.manifest_file = node[:hostname] + ".pp"
        puppet.module_path = "modules"
        # puppet.options = [ "--verbose" ]
      end
    end
  end
end