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[Stephen Finucane <sfinucan@xxxxxxxxxx>]

OK, so this really looks like it was fixed in [1]. We don't always
expose IPv6 [2], but we seem to do so if the instance's 'network_info'
object contains IPv6 subnets [3].

I'm not 100% on this, but I'm sure enough to mark this as invalid.
Please reopen if I've missed something.

[1] https://review.openstack.org/#/c/430910/6/nova/virt/netutils.py
[2] https://github.com/openstack/nova/blob/16.0.0/nova/virt/netutils.py#L162-L164
[3] https://github.com/openstack/nova/blob/16.0.0/nova/virt/netutils.py#L131

** Changed in: nova
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1704458

Title:
  The use_ipv6 flag not only influences nova networking

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Description
  ===========

  The use_ipv6 flag is marked as deprecated in the Ocata release (https://docs.openstack.org/ocata/config-reference/compute/config-options.html ) because it Nova networking is planed to be removed. However this flag also influences the data generated in the network_data.json. If the flag is set to false the IPv6 networks are missing from the JSON. If the value is true the JSON contains the IPv6 interfaces. Further details can be found here:
  https://bugs.launchpad.net/nova/+bug/1514082

  If default value (false) is also inconsistent with the data returned
  by Neutron through the meta data service.
  http://169.254.169.254/openstack/latest/network_data.json

  Steps to reproduce
  ==================

  1. Boot a server with 2 interfaces one IPv4 and one IPv6
  2. mount /dev/sr0 /mnt
  3. The /mnt/openstack/latest/network-data.json does not contain IPv6 addresses

  0. Change the use_ipv6 flag to true on all compute nodes and restart the compute service
  1. Boot a server with 2 interfaces one IPv4 and one IPv6
  2. mount /dev/sr0 /mnt
  3. The /mnt/openstack/latest/network-data.json does not contain IPv6 addresses

  Expected result
  ===============

  Option 0: Nova should donwload the network-data.json from the Neutron
  metadata service and expose it as is on the config drive.

  Option 1: Change the description of the use_ipv6 to: "Configures if the IPv6 addresses should be included in the config drive. (Remove deprecation warning)
  Change the default value to true to be in sync with neutron behaviour.

  Option 2: The generation of the network-data.json on config drive
  should always include the IPv6 addresses.

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