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[Stephen Finucane <1441419@xxxxxxxxxxxxxxxxxx>]

This was fixed in neutron. There's no bug against nova here.

** Changed in: nova
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1441419

Title:
  port 'binding:host_id' can't be removed when VM is deleted

Status in OpenStack Compute (nova):
  Won't Fix

Bug description:
  reproduce this problem:
  1. create a neutron port
  2. use this port to boot a VM
  3. delete this VM
  4. we can see port still exist, but the 'binding:host_id' can't be removed

  the reason is that in _unbind_ports, when it update the port, it set
  'port_req_body['port']['binding:host_id'] = None', but for neutron,
  when update the port, if the attribute is None, it will not change

      def _unbind_ports(self, context, ports,
                        neutron, port_client=None):

          port_binding = self._has_port_binding_extension(context,
                              refresh_cache=True, neutron=neutron)
          if port_client is None:
              # Requires admin creds to set port bindings
              port_client = (neutron if not port_binding else
                             get_client(context, admin=True))
          for port_id in ports:
              port_req_body = {'port': {'device_id': '', 'device_owner': ''}}
              if port_binding:
                  port_req_body['port']['binding:host_id'] = None

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