https://github.com/chef/chef-provisioning/issues/322#issuecomment-91955177

simple.rb

require 'chef/provisioning/aws_driver'

with_driver 'aws'

# Public subnet
machine 'test' do
  tag 'test_successful'
  recipe 'hdp::default'
  with_machine_options :bootstrap_options => {
    :key_name => 'jreid2012',
    :image_id => 'ami-2c348844',
    :subnet => 'subnet-aebab1da',
    :security_groups => [ 'hortonworks_chef' ],
    :instance_type => 'm3.medium',
    :associate_public_ip_address => true
  }
end