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Hi Roberto,

thank you for your findings. Those are all great news, especially the recently merged commit in cloud-init! Do you already have a patchset that works? Is anyone working on it upstream?

Best regards, Justin

Am Freitag, dem 18.11.2022 um 18:15 -0300 schrieb Roberto Bartzen Acosta:

Hello Rodolfo,
With some hacks in the functions/lines below, I can perform tests with the neutron-ovn-metadata-agent IPv6-only.
[1] https://opendev.org/openstack/neutron/src/branch/master/neutron/agent/ovn/metadata/agent.py#L432
[2] https://opendev.org/openstack/neutron/src/branch/master/neutron/agent/ovn/metadata/driver.py#L59
[3] https://opendev.org/openstack/neutron/src/branch/master/neutron/agent/ovn/metadata/server.py#L101
[4] https://opendev.org/openstack/neutron/src/branch/master/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/impl_idl_ovn.py#L922

However, I think the LLC address that the VM autoconfigures (needed by [3]), needs to be learned from the port_Binding table of the OVN southbound - or something to make this work on neutron-metadata side.

Regards,
Roberto

ov 18 20:56:21 compute2 neutron-ovn-metadata-agent[206406]: 2022-11-18 20:56:21.575 206406 DEBUG eventlet.wsgi.server [-] (206406) accepted '' server /usr/local/lib/python3.10/dist-packages/eventlet/wsgi.py:1004
Nov 18 20:56:21 compute2 neutron-ovn-metadata-agent[206406]: 2022-11-18 20:56:21.576 206406 DEBUG neutron.agent.ovn.metadata.server [-] Request: GET / HTTP/1.0
                                                             Accept: /
                                                             Connection: close
                                                             Content-Type: text/plain
                                                             Host: [fe80::a9fe:a9fe]
                                                             User-Agent: curl/7.68.0
                                                             X-Forwarded-For: fe80::f816:3eff:fe22:d958
                                                             X-Ovn-Network-Id: 2af7badf-1958-4fc8-b13a-b2e8379e6531 call /usr/lib/python3/dist-packages/neutron/agent/ovn/metadata/server.py:84
Nov 18 20:56:21 compute2 neutron-ovn-metadata-agent[206406]: 2022-11-18 20:56:21.587 206406 DEBUG neutron.agent.ovn.metadata.server [-] <Response [200]> _proxy_request /usr/lib/python3/dist-packages/neutron/agent/ovn/metadata/server.py:164
Nov 18 20:56:21 compute2 haproxy[206448]: fe80::f816:3eff:fe22:d958:37348 [18/Nov/2022:20:56:21.574] listener listener/metadata 0/0/0/13/13 200 218 - - ---- 1/1/0/0/0 0/0 "GET / HTTP/1.1"
Nov 18 20:56:21 compute2 neutron-ovn-metadata-agent[206406]: 2022-11-18 20:56:21.588 206406 INFO eventlet.wsgi.server [-] fe80::f816:3eff:fe22:d958, "GET / HTTP/1.1" status: 200  len: 234 time: 0.0112894


root at ubuntu:~# curl [fe80::a9fe:a9fe%ens3]
1.0
2007-01-19
2007-03-01
2007-08-29
2007-10-10
2007-12-15
2008-02-01
2008-09-01
2009-04-04

Em sex., 18 de nov. de 2022 às 15:04, Roberto Bartzen Acosta <[roberto.acosta at luizalabs.com](mailto:roberto.acosta at luizalabs.com)> escreveu:
> 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](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=[], 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=[], 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 at redhat.com](mailto:ralonsoh at 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/](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](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 at luizalabs.com](mailto:roberto.acosta at 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](https://bugs.launchpad.net/neutron/+bug/1460177) and the fork of the discussion in many opendev reviews [#315604](https://review.opendev.org/c/openstack/neutron-specs/+/315604), [#738205](https://review.opendev.org/c/openstack/neutron-lib/+/738205) [#745705](https://review.opendev.org/c/openstack/neutron/+/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](https://docs.openstack.org/nova/latest/user/config-drive.html)."**
> > >
> > > 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](https://docs.openstack.org/neutron/latest/admin/config-ipv6.html#configuring-interfaces-of-the-guest)

> > > > > > > > >
> > > > > > > > > > > > > > > > > > > > > > > > > > > *‘Esta mensagem é direcionada apenas para os endereços constantes no cabeçalho inicial. Se você não está listado nos endereços constantes no cabeçalho, pedimos-lhe que desconsidere completamente o conteúdo dessa mensagem e cuja cópia, encaminhamento e/ou execução das ações citadas estão imediatamente anuladas e proibidas’.*
> > > > > > > > > * **‘Apesar do Magazine Luiza tomar todas as precauções razoáveis para assegurar que nenhum vírus esteja presente nesse e-mail, a empresa não poderá aceitar a responsabilidade por quaisquer perdas ou danos causados por esse e-mail ou por seus anexos’.*





> >
>


‘Esta mensagem é direcionada apenas para os endereços constantes no cabeçalho inicial. Se você não está listado nos endereços constantes no cabeçalho, pedimos-lhe que desconsidere completamente o conteúdo dessa mensagem e cuja cópia, encaminhamento e/ou execução das ações citadas estão imediatamente anuladas e proibidas’.
* **‘Apesar do Magazine Luiza tomar todas as precauções razoáveis para assegurar que nenhum vírus esteja presente nesse e-mail, a empresa não poderá aceitar a responsabilidade por quaisquer perdas ou danos causados por esse e-mail ou por seus anexos’.*





-- 
Justin Lamp
Systems Engineer

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