parameters:
  network:
    type: string
    label: Network
    description: Network to connect to
    default: private-network
  network2:
    type: string
    label: Network2
    description: Network to connect to
    default: none

conditions:
  network2_eq_none:    {equals : [{get_param: network2}, "none"]}
  network2_not_none:   {not : network2_eq_none }

resources:
  server:
    type: OS::Nova::Server
    properties:
      name: foobar
      key_name: { get_param: key_name }
      flavor: { get_param: flavor }
      networks:
         - port: { get_resource: autoport }
         - port: { get_resource: autoport2 }

  autoport:
    type: OS::Neutron::Port
    properties:
      name: { get_param: name }
      network: { get_param: network }
      security_groups: { get_param: security_groups }

  autoport2:
    type: OS::Neutron::Port
    condition: network2_not_none
    properties:
      name: { get_param: name }
      network: { get_param: network2 }
      security_groups: { get_param: security_groups }