create_provisioner.rb

require 'chef/provisioning'

# with_chef_server Chef::Config[:chef_server_url], {
with_chef_server "https://api.opscode.com/organizations/XXXX", {
  :client_name => Chef::Config[:node_name],
  :signing_key_filename => Chef::Config[:client_key]
}

machine 'provisioner' do
  recipe 'chef-metal::docker'
  converge true
end

vagrant_linux.rb

require 'chef/provisioning/vagrant_driver'

with_driver 'vagrant'

vagrant_box 'trusty64' do
  url 'https://vagrantcloud.com/chef/boxes/ubuntu-14.04/versions/1/providers/virtualbox.box'
end

with_machine_options :vagrant_options => {
  'vm.box' => 'trusty64'
}