zone fact

zone.rb

Facter.add(:my_zone) do
#  confine :kernel => :Linux
  setcode do
    net = Facter.value('ipaddress').split('.').shift(2).join('.')
    # scheme is: 10.13x.x.x == west_datacenter and so on
    case net
      when /^10\.13[0-9]$/
        zone = 'west_datacenter'
      when /^10\.14[0-9]$/
        zone = 'euro_datacenter'
       when /^10\.15[0-9]$/
        zone = 'east_datacenter'
      else
        zone = 'unknown'
    end
    zone
  end
end