Get vpc id, put file at /usr/lib/ruby/vendor_ruby/facter

ec2_vpc_id.rb

require "net/http"
require "facter"
require "facter/ec2"


# vpc-id is in a newer metadata api rev than the usual EC2 facts
Facter.add(:ec2_vpc_id) do
  setcode do
    if !Facter.value('ec2_instance_id').nil? && !Facter.value('ec2_mac').nil?
      mac = Facter.value('ec2_mac')
      Facter.value("ec2_network_interfaces_macs_#{mac}_vpc_id")
    end
  end
end