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[Robert Collins <1180454@xxxxxxxxxxxxxxxxxx>]

(This was in H3).

** Changed in: nova
     Assignee: Devananda van der Veen (devananda) => dkehn (dekehn)

** Changed in: nova
       Status: Incomplete => Fix Released

** Changed in: nova
    Milestone: None => havana-rc1

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https://bugs.launchpad.net/bugs/1180454

Title:
  Cannot orchestrate PXE booting from nova

Status in OpenStack Compute (Nova):
  Fix Released
Status in tripleo - openstack on openstack:
  Triaged

Bug description:
  Nova baremetal requires PXE booting of nodes, but the network code in
  nova doesn't arrange for PXE DHCP options to be supplied [by quantum].

  In the same manner that the MAC address limitations are exported by
  the driver, DHCP options should be exported by the driver and then
  passed onto the network provider - and for the quantum driver we can
  pass these onto the port for quantum.

  In nova/compute/manager.py:
      def _build_instance(self, context, request_spec, filter_properties,
  ...
                  macs = self.driver.macs_for_instance(instance)
          
                  network_info = self._allocate_network(context, instance,
                          requested_networks, macs, security_groups)

  
  I suggest changing that to be something like
                  macs = self.driver.macs_for_instance(instance)
                  dhcp_options = self.driver.dhcp_options_for_instance(instance)        
                  network_info = self._allocate_network(context, instance,
                          requested_networks, macs, security_groups, dhcp_options)

  that calls _allocate_network which calls
  self.network_api.allocate_for_instance

  - and self.network_api for quantum environments is
  nova/network/quantumv2/api.py's API instance - so once dhcp_options
  gets down to there, you can use the Quantum API's directly and poke it
  in when the port is allocated/updated.

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