Hi Rodolfo,

Thanks for the feedback, we know it's supported by default in neutron metadata agent.

My question came because I couldn't make it work with the neutron-ovn-metadata-agent. Checking some logs I believe that the problem is because the Port_Binding external_ids should have the "neutron:cidrs" [1],but this is empty.
[1] - https://opendev.org/openstack/neutron/src/branch/master/neutron/agent/ovn/metadata/agent.py#L432

I still don't know how to solve this (:

Regards,

neutron-ovn-metadata-agent logs: 
Nov 18 17:38:52 compute2 neutron-ovn-metadata-agent[188802]: 2022-11-18 17:38:52.996 188802 DEBUG ovsdbapp.backend.ovs_idl.event [-] Matched UPDATE: PortBindingChassisCreatedEvent(events=('update',), table='Port_Binding', conditions=None, old_conditions=None), priority=20 to row=Port_Binding(parent_port=[], chassis=[<ovs.db.idl.Row object at 0x7f4e958ba770>], mac=['fa:16:3e:e8:92:d8 2001:db9:1234::35e'], options={'mcast_flood_reports': 'true', 'requested-chassis': 'compute2'}, ha_chassis_group=[], type=, tag=[], requested_chassis=[<ovs.db.idl.Row object at 0x7f4e958ba770>], tunnel_key=3, up=[False], logical_port=2beb4efd-23c1-4bf6-b57d-6c97a0277124, gateway_chassis=[], external_ids={'neutron:cidrs': '2001:db9:1234::35e/64', 'neutron:device_id': 'cfbbc54a-1772-495b-8fe4-864c717e22b4', 'neutron:device_owner': 'compute:nova', 'neutron:network_name': 'neutron-2af7badf-1958-4fc8-b13a-b2e8379e6531', 'neutron:port_name': '', 'neutron:project_id': 'd11daecfe9d847ddb7d9ce2932c2fe26', 'neutron:revision_number': '2', 'neutron:security_group_ids': 'cf2e7d53-0db7-4873-82ab-cf67eceda937'}, encap=[], virtual_parent=[], nat_addresses=[], datapath=02e203c7-714a-417c-bc02-c2877ec758a7) old=Port_Binding(chassis=[]) matches /usr/lib/python3/dist-packages/ovsdbapp/backend/ovs_idl/event.py:43
Nov 18 17:38:52 compute2 neutron-ovn-metadata-agent[188802]: 2022-11-18 17:38:52.996 188802 INFO neutron.agent.ovn.metadata.agent [-] Port 2beb4efd-23c1-4bf6-b57d-6c97a0277124 in datapath 2af7badf-1958-4fc8-b13a-b2e8379e6531 bound to our chassis
Nov 18 17:38:52 compute2 neutron-ovn-metadata-agent[188802]: 2022-11-18 17:38:52.996 188802 DEBUG neutron.agent.ovn.metadata.agent [-] Provisioning metadata for network 2af7badf-1958-4fc8-b13a-b2e8379e6531 provision_datapath /usr/lib/python3/dist-packages/neutron/agent/ovn/metadata/agent.py:434
Nov 18 17:38:52 compute2 neutron-ovn-metadata-agent[188802]: 2022-11-18 17:38:52.997 188802 DEBUG neutron.agent.ovn.metadata.agent [-] There is no metadata port for network 2af7badf-1958-4fc8-b13a-b2e8379e6531 or it has no MAC or IP addresses configured, tearing the namespace down if needed provision_datapath /usr/lib/python3/dist-packages/neutron/agent/ovn/metadata/agent.py:442
Nov 18 17:38:52 compute2 neutron-ovn-metadata-agent[188802]: 2022-11-18 17:38:52.997 188812 DEBUG oslo.privsep.daemon [-] privsep: reply[c6aff129-2417-45c3-bee1-7b01ff6298f9]: (4, False) _call_back /usr/local/lib/python3.10/dist-packages/oslo_privsep/daemon.py:501

Em sex., 18 de nov. de 2022 às 12:25, Rodolfo Alonso Hernandez <ralonsoh@redhat.com> escreveu:

Hi Roberto:

The documentation you are referring to must be updated. The LP#1460177 RFE implemented this feature. Actually there is a test class that is testing this functionality in the CI [1][2].

Regards.

[1]https://review.opendev.org/c/openstack/neutron-tempest-plugin/+/750355/

[2]https://github.com/openstack/neutron-tempest-plugin/blob/f10618eac3a12d35a35044443b63d144b71e0c6b/neutron_tempest_plugin/scenario/test_metadata.py#L36-L44

On Fri, Nov 18, 2022 at 2:45 PM Roberto Bartzen Acosta <roberto.acosta@luizalabs.com> wrote:

Hey folks,

Can you confirm if the metadata should work in an ipv6-only environment?

As I understand from this discussion on LP:1460177 and the fork of the discussion in many opendev reviews #315604, #738205 #745705, ..., it seems like it should work.

However, this comment in the openstack doc [1] has me questioning if it really works.

"There are no provisions for an IPv6-based metadata service similar to what is provided for IPv4. In the case of dual-stacked guests though it is always possible to use the IPv4 metadata service instead. IPv6-only guests will have to use another method for metadata injection such as using a configuration drive, which is described in the Nova documentation on config-drive."

Is anyone using metadata in an ipv6-only Openstack setup?

Regards,

Roberto

[1] https://docs.openstack.org/neutron/latest/admin/config-ipv6.html#configuring-interfaces-of-the-guest

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