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Hi - I'm trying to create a OS::Neutron::LoadBalancer on the first 
subnet of a network being supplied as a parameter. So I don't want to 
create the network - it's an input parameter - and I don't want/need the 
subnet as a parameter - any subnet defined on the network will do.

I cannot figure out how to get the subnet id of the network. In the code 
below I tried to create a port on the network and then extract the value 
of the subnet to use in creating the OS::Neutron::Pool but I end up with 
an extra port. I tried to use the port ip address for the VIP but 
OS::Neutron::Pool wants to create the vip port, and complains that the 
IP address is already in use.

My question is how do we create a resource from a parameter when we 
already have the resource id or name, so the attributes can be queried 
in subsequent resource definitions? Is there a way to do that in heat?

heat_template_version: 2015-10-15
description: Make a load balancer with a floating ip without a subnet

parameters:
   network:
     type: string
     description: Network used by the server

   external_network_id:
     type: string
     description: UUID of a Neutron external network

resources:
   make_port_on_the_net:
     type: OS::Neutron::Port
     properties:
       name : {list_join : [":", ["vip"  , {get_param: network}]] }
       network: {get_param: network }

   monitor:
     type: OS::Neutron::HealthMonitor
     properties:
       type: TCP
       delay: 5
       max_retries: 5
       timeout: 5

   pool:
     type: OS::Neutron::Pool
     properties:
       protocol: HTTP
       monitors: [{get_resource: monitor}]
       subnet: {get_attr: [make_port_on_the_net, fixed_ips, 0, subnet_id]}
       lb_method: ROUND_ROBIN
       vip:
         protocol_port: 80
         address: {get_attr: [make_port_on_the_net, fixed_ips, 0, 
ip_address]}
   lb:
     type: OS::Neutron::LoadBalancer
     properties:
       protocol_port: 80
       pool_id: {get_resource: pool}

   # assign a floating ip address to the load balancer
   # pool.
   lb_floating:
     type: OS::Neutron::FloatingIP
     properties:
       floating_network_id: {get_param: external_network_id}
       port_id: {get_attr: [pool, vip, port_id]}

outputs:
   port_show:
     value: {get_attr: [make_port_on_the_net]}
     description: Dump all the port attributes

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