diff --git a/Vagrantfile b/Vagrantfile
index ee31732..3399321 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -3,29 +3,37 @@
 ROOT = File.dirname(File.expand_path(__FILE__))
 
 # Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
-VAGRANTFILE_API_VERSION = "2"
+VAGRANTFILE_API_VERSION = '2'
+
+BASE_BOX_URL    = ENV['BASE_BOX_URL'   ] || "https://oss-binaries.phusionpassenger.com/vagrant/boxes/"
+VAGRANT_BOX_URL = ENV['VAGRANT_BOX_URL'] || BASE_BOX_URL + "ubuntu-12.04.3-amd64-vbox.box"
+VMWARE_BOX_URL  = ENV['VMWARE_BOX_URL' ] || BASE_BOX_URL + "ubuntu-12.04.3-amd64-vmwarefusion.box"
+
+$script = <<SCRIPT
+wget -q -O - https://get.docker.io/gpg | apt-key add -
+echo deb http://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list
+apt-get update -qq
+apt-get install -q -y --force-yes lxc-docker
+usermod -a -G docker vagrant
+docker version
+su - vagrant -c 'echo alias d=docker >> ~/.bash_aliases'
+SCRIPT
 
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
-  config.vm.box = "phusion-open-ubuntu-12.04-amd64"
-  config.vm.box_url = "https://oss-binaries.phusionpassenger.com/vagrant/boxes/ubuntu-12.04.3-amd64-vbox.box"
+  config.vm.box = 'phusion-open-ubuntu-12.04-amd64'
+  config.vm.box_url = VAGRANT_BOX_URL
   config.ssh.forward_agent = true
-  if File.directory?("#{ROOT}/../passenger-docker")
-    config.vm.synced_folder File.expand_path("#{ROOT}/../passenger-docker"),
-      "/vagrant/passenger-docker"
+  passenger_path = "#{ROOT}/../passenger-docker"
+  if File.directory?(passenger_path)
+    config.vm.synced_folder File.expand_path(passenger_path), "/vagrant/passenger-docker"
   end
 
   config.vm.provider :vmware_fusion do |f, override|
-    override.vm.box_url = "https://oss-binaries.phusionpassenger.com/vagrant/boxes/ubuntu-12.04.3-amd64-vmwarefusion.box"
-    f.vmx["displayName"] = "baseimage-docker"
+    override.vm.box_url = VMWARE_BOX_URL
+    f.vmx['displayName'] = 'baseimage-docker'
   end
 
   if Dir.glob("#{File.dirname(__FILE__)}/.vagrant/machines/default/*/id").empty?
-    # Add lxc-docker package
-    pkg_cmd = "wget -q -O - https://get.docker.io/gpg | apt-key add -;" \
-      "echo deb http://get.docker.io/ubuntu docker main > /etc/apt/sources.list.d/docker.list;" \
-      "apt-get update -qq; apt-get install -q -y --force-yes lxc-docker; "
-    # Add vagrant user to the docker group
-    pkg_cmd << "usermod -a -G docker vagrant; "
-    config.vm.provision :shell, :inline => pkg_cmd
+    config.vm.provision :shell, :inline => $script
   end
 end