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heat - assigning existing port to a load balancer fails

asked 2020-02-26 21:42:36 -0500

MichaelKostan gravatar image

Hi There, I'm starting to believe that its not possible to assign an pre-created network port to a new Octavia::LoadBalancer in a heat template.

Doing exactly that using the CLI works fine…

  openstack port create my_lb_port --network management
  openstack loadbalancer create --name my_lb --vip-port-id my_lb_port

However, I have not found a way to do the same in a heat template like this one…

    type: OS::Octavia::LoadBalancer
      description: myDescription
      name: myName
      vip_subnet: management
      # using an existing IP address (down, not attached) produces the error "The IP address is in use"
      # using the port name or ID produces the error "Error validating value 'my_lb_port': Invalid IP address"
      #vip_address: my_lb_port
      #vip_address: 613b20b6-8bbb-475a-8bc2-993b4b8d558a
      # and using fictional properties (desparate I am) did produce errors like "Unknown Property vip_port_id"
      #vip_port_id: my_lb_port

Hmmh, I would have thought that whatever is possible in the CLI should work in heat too.

Before I give up - Did you manage to solve/address a similar challenge, or if this is a known feature?

Cheers, Michael

Background: We are trying to separate the port and loadbalancer creation as we have a static DNS environment which requires manual updates.

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answered 2020-02-27 07:52:35 -0500

zaneb gravatar image

It appears that Octavia allows three different ways to specify the port:

  1. vip_port_id (+ vip_subnet_id or vip_address if ambiguous)
  2. vip_network_id
  3. vip_subnet_id

But the Heat resource only supports the last one, so Octavia always tries to create a port.

Not implementing vip_network_id may have been intentional (stuff automatically selecting a subnet behind the scenes is a pain for Heat because it adds invisible dependencies between resources). But it's likely that vip_port_id was either overlooked or added after the Heat resource was implemented. Heat would have to add support for it in order to do what you want.

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Thank you very much. Sigh - I wish you would have shared different news :) Anyways, this confirms my observations and I will get on with what we have and let the HEAT loadbalancer create the port. Begs the question - how to rename a Octavia port. I shall explore... Again thanks. Cheers, Michael

MichaelKostan gravatar imageMichaelKostan ( 2020-02-27 12:08:32 -0500 )edit

On the bright side... patches welcome ;)

zaneb gravatar imagezaneb ( 2020-02-28 20:28:23 -0500 )edit

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Asked: 2020-02-26 21:40:10 -0500

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Last updated: Feb 27 '20