Open Stack

Hi everyone,

On Thu, Jul 13, 2023 at 07:29:51PM -0300, Roberto Bartzen Acosta wrote:
> Hi Rodolfo,
>
> Em qui., 13 de jul. de 2023 às 13:45, Rodolfo Alonso Hernandez <
> ralonsoh at redhat.com> escreveu:
>
> > Hello Roberto:
> >
> > I think you have provided a very detailed explanation of the issue but you
> > still didn't present any possible solution. I would ask you at least for a
> > proposal and for specific details of what is failing in the OVN sync tool.
> >
> > For example, if you add a TS between two clouds, you'll need to create (1)
> > routers (NAT registers), (2) router ports (LRP) and (3) some static routes
> > (LRSR). All these elements are monitored by the DB sync tool and will fail
> > because the counterparts in the Neutron DB don't exist. I guess that you
> > have some script or tool or at least a document to manually add these
> > resources; sharing it could help to find a solution.
> >
> > If these elements are manually created during the deployment phase, you
> > can also control the information provided. I'm thinking about the
> > "external_ids" field; we can push some defined constant that will make
> > these registers transparent to the OVN DB sync tool.

As these resources are also created by tools not necessarily controlled
by us we need to avoid changing them.
I would therefor propose to not add a "ignore" constant to the
"external_ids", to to rather check for the existence of the neutron keys
in "external_ids" (i think thats also what is described in the bug
below).

> >
> > Please check this idea and if it is feasible. In that case, please add a
> > topic to the Neutron drivers meeting agenda [1] to discuss it.
> >
>
> That sounds good, thanks.
> https://bugs.launchpad.net/neutron/+bug/2027742

>From my perspective there is also an additional step after the above
REF. Currently it just makes it possible to use ovn-ic without neutron
killing it.
However if we could get neutron to treat a Transit Switch as a external
network we would skip the need to implement the NAT, LRP and LRSR logic
in custom tooling and could use the existing neutron code. This would
probably require creating a custom type of provider network and then
specifying the transit switch name in the provider options.

Is that something that from your perspective we should take a look at
right away, or rather first focus und neutron not burning the transit
switch.

Regards
Felix

>
> Regards,
> Roberto
>
>
> >
> > Regards.
> >
> > [1]https://wiki.openstack.org/wiki/Meetings/NeutronDrivers
> >
> >
> > On Wed, Jul 12, 2023 at 2:12 PM Roberto Bartzen Acosta <
> > roberto.acosta at luizalabs.com> wrote:
> >
> >>
> >>
> >> Em qua., 12 de jul. de 2023 às 09:05, Roberto Bartzen Acosta <
> >> roberto.acosta at luizalabs.com> escreveu:
> >>
> >>> Hi Rodolfo,
> >>>
> >>> Thanks for the feedback.
> >>>
> >>> I liked the idea of having a different network type only to hold the
> >>> Transit Switches and thus the LRP but it depends on some factors like
> >>> multi-tenancy.
> >>> From the OVN perspective, the TS is global and will only be linked to a
> >>> tenant when it is plugged into the tenant router port. My concern here is
> >>> that if Neutron manages the TS, it will need to assume the dynamic
> >>> characteristics of this TS function, ovn-ic creates and removes the TS in
> >>> NB_Global, in addition to plugging and removing ports in this switch
> >>> according to the network topology. Additionally, Neutron would still need
> >>> to handle the learned remote routes (which are listed as static routes from
> >>> the tenant router perspective).
> >>>
> >> sorry: NB_Global  -> Northbound Database.
> >>
> >>
> >>> This is an open discussion, Felix can add ideas here.
> >>>
> >>> In general, it seems to me that we have no alternatives for this type of
> >>> solution other than OVN-IC (note that ovn-bgp-agent does not learn remote
> >>> routes at the SDN level / OVN).
> >>> OpenStack seems to be designed to run like a "bubble" and this traffic
> >>> from one VM to another always needs to be routed at the FIP level and
> >>> external routing layers.
> >>>
> >>> Regards,
> >>> Roberto
> >>>
> >>> Em qua., 12 de jul. de 2023 às 05:11, Rodolfo Alonso Hernandez <
> >>> ralonsoh at redhat.com> escreveu:
> >>>
> >>>> Hello Roberto:
> >>>>
> >>>> We talked about this possible RFE during the PTG [1] but I don't
> >>>> remember having any proposal. Actually what I remember (and was written in
> >>>> the etherpad) is that you were going to present an RFE. Can you explain it
> >>>> briefly?
> >>>>
> >>>> We also talked about the idea, proposed by Felix in the mailing list,
> >>>> of having a different network type only to hold the Transit Switches and
> >>>> thus the LRP. If you have a proposal, please present it.
> >>>>
> >>>> Regards.
> >>>>
> >>>> [1]https://etherpad.opendev.org/p/neutron-bobcat-ptg#L506
> >>>>
> >>>> On Tue, Jul 11, 2023 at 10:50 PM Roberto Bartzen Acosta <
> >>>> roberto.acosta at luizalabs.com> wrote:
> >>>>
> >>>>> Hello Neutron folks,
> >>>>>
> >>>>> Regarding the conversation started in March [1] about the use of OVN
> >>>>> interconnect with Neutron, I would like to evolve the discussion in
> >>>>> relation to resources allocated by OVN-IC and which are not managed by
> >>>>> Neutron. In the March PTG [2], the problem related to the db_sync tool was
> >>>>> presented, and a proposed solution in which Neutron does not manage these
> >>>>> resources.
> >>>>>
> >>>>> After discussing some architectural designs with Felix/StackIT, it
> >>>>> seems to make sense to come up with a proposal to change the mech_driver to
> >>>>> validate the external_ids key and not remove resources present in the OVN
> >>>>> backend without Neutron "signature".
> >>>>>
> >>>>> The discussion here is more complex than it seems, because
> >>>>> architecturally Neutron does not allow us to interconnect workloads in
> >>>>> multiple AZs (with different OpenStacks), but this could be a requirement
> >>>>> for a high availability cloud solution (Cloud Region). Additionally, this
> >>>>> OVN-IC solution allows interconnecting other cloud backends that use OVN,
> >>>>> in the case of kubernetes with ovn-kube.
> >>>>>
> >>>>> We tested an OVN interconnect integrated with 3 OpenStack
> >>>>> installations and it worked very well !!! considering direct L3 traffic at
> >>>>> the router level between different network infrastructures.
> >>>>>
> >>>>> SYNC_REPAIR - problem
> >>>>>
> >>>>> * Static Routes (learned OVN-IC routes)
> >>>>> * Router Port -> Transit Switches
> >>>>>
> >>>>> Jul 10 18:34:11 os-infra-1-neutron-server-container-845157ae
> >>>>> neutron-server[8632]: 2023-07-10 18:34:11.343 8632 WARNING
> >>>>> neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.ovn_db_sync
> >>>>> [req-8d513732-f932-47b8-bc2c-937958c30f47 - - - - -] Router Port found in
> >>>>> OVN but not in Neutron, port_id=rt2-admin-tenant1
> >>>>> Jul 10 18:34:11 os-infra-1-neutron-server-container-845157ae
> >>>>> neutron-server[8632]: 2023-07-10 18:34:11.343 8632 WARNING
> >>>>> neutron.plugins.ml2.drivers.ovn.mech_driver.ovsdb.ovn_db_sync
> >>>>> [req-8d513732-f932-47b8-bc2c-937958c30f47 - - - - -] Router
> >>>>> 9823d34b-bb2a-480c-b3f6-cf51fd19db52 static routes [{'destination': '
> >>>>> 10.0.0.1/24', 'nexthop': '169.254.100.1'}, {'destination': '
> >>>>> 10.0.2.1/24', 'nexthop': '169.254.100.3'}] found in OVN but not in
> >>>>> Neutron
> >>>>>
> >>>>>
> >>>>> Any suggestions on how to resolve this db_sync issue? since all other
> >>>>> Neutron modules did not present any problem with OVN-IC (as far as I
> >>>>> tested).
> >>>>> I remember Terry was keen to suggest some things to help. I believe
> >>>>> that before proposing some complex mechanism to solve this simple problem,
> >>>>> I would like to hear the community opinion. In our use case, a bit change
> >>>>> in db_sync with filter by neutron key in external_ids would be enough.
> >>>>>
> >>>>> Regards,
> >>>>> Roberto
> >>>>>
> >>>>>
> >>>>>
> >>>>> [1]
> >>>>> https://lists.openstack.org/pipermail/openstack-discuss/2023-March/032624.html
> >>>>> [2] https://etherpad.opendev.org/p/neutron-bobcat-ptg
> >>>>>
> >>>>>
> >>>>>
> >>>>> Additional logs:
> >>>>>
> >>>>> OpenStack 1
> >>>>>
> >>>>> root at os-infra-1-neutron-ovn-northd-container-f931b37c:~#
> >>>>> root at os-infra-1-neutron-ovn-northd-container-f931b37c:~#
> >>>>> root at os-infra-1-neutron-ovn-northd-container-f931b37c:~# ovn-nbctl
> >>>>> lr-route-list 6b776115-746a-4c59-aa73-6674c70b3498
> >>>>> IPv4 Routes
> >>>>> Route Table <main>:
> >>>>>               20.0.1.0/24             169.254.200.2 dst-ip (learned)
> >>>>>               20.0.2.0/24             169.254.200.3 dst-ip (learned)
> >>>>>                 0.0.0.0/0             200.200.200.1 dst-ip
> >>>>>
> >>>>> IPv6 Routes
> >>>>> Route Table <main>:
> >>>>>                      ::/0     fc00:ca5a:ca5a:8000:: dst-ip
> >>>>> root at os-infra-1-neutron-ovn-northd-container-f931b37c:~# ovn-nbctl
> >>>>> lr-route-list 23d4552a-62c4-40e1-8bae-d06af3489c07
> >>>>> IPv4 Routes
> >>>>> Route Table <main>:
> >>>>>               10.0.1.0/24             169.254.100.2 dst-ip (learned)
> >>>>>               10.0.2.0/24             169.254.100.3 dst-ip (learned)
> >>>>>                 0.0.0.0/0             200.200.200.1 dst-ip
> >>>>>
> >>>>> IPv6 Routes
> >>>>> Route Table <main>:
> >>>>>                      ::/0     fc00:ca5a:ca5a:8000:: dst-ip
> >>>>> root at os-infra-1-neutron-ovn-northd-container-f931b37c:~#
> >>>>>
> >>>>>
> >>>>> OpenStack 2
> >>>>>
> >>>>> root at os-infra-1-neutron-ovn-northd-container-30f7e935:~# ovn-nbctl
> >>>>> lr-route-list dc1e5008-adb9-451e-8b71-09388f3680bc
> >>>>> IPv4 Routes
> >>>>> Route Table <main>:
> >>>>>               20.0.0.0/24             169.254.200.1 dst-ip (learned)
> >>>>>               20.0.2.0/24             169.254.200.3 dst-ip (learned)
> >>>>>                 0.0.0.0/0             200.200.200.1 dst-ip
> >>>>>
> >>>>> IPv6 Routes
> >>>>> Route Table <main>:
> >>>>>                      ::/0     fc00:ca5a:ca5a:8000:: dst-ip
> >>>>> root at os-infra-1-neutron-ovn-northd-container-30f7e935:~# ovn-nbctl
> >>>>> lr-route-list ce45f681-6454-43fe-974f-81344bb8113a
> >>>>> IPv4 Routes
> >>>>> Route Table <main>:
> >>>>>               10.0.0.0/24             169.254.100.1 dst-ip (learned)
> >>>>>               10.0.2.0/24             169.254.100.3 dst-ip (learned)
> >>>>>                 0.0.0.0/0             200.200.200.1 dst-ip
> >>>>>
> >>>>> IPv6 Routes
> >>>>> Route Table <main>:
> >>>>>                      ::/0     fc00:ca5a:ca5a:8000:: dst-ip
> >>>>>
> >>>>>
> >>>>>
> >>>>> OpenStack 3
> >>>>>
> >>>>> root at os-infra-1-neutron-ovn-northd-container-f237db97:~#
> >>>>> root at os-infra-1-neutron-ovn-northd-container-f237db97:~# ovn-nbctl
> >>>>> lr-route-list  cfa259d6-311f-4409-bcf2-79a929835cb3
> >>>>> IPv4 Routes
> >>>>> Route Table <main>:
> >>>>>               20.0.0.0/24             169.254.200.1 dst-ip (learned)
> >>>>>               20.0.1.0/24             169.254.200.2 dst-ip (learned)
> >>>>>                 0.0.0.0/0             200.200.200.1 dst-ip
> >>>>>
> >>>>> IPv6 Routes
> >>>>> Route Table <main>:
> >>>>>                      ::/0     fc00:ca5a:ca5a:8000:: dst-ip
> >>>>> root at os-infra-1-neutron-ovn-northd-container-f237db97:~# ovn-nbctl
> >>>>> lr-route-list  c5a4dcd8-b9a6-4397-a7cf-88bc1e01b0b0
> >>>>> IPv4 Routes
> >>>>> Route Table <main>:
> >>>>>               10.0.0.0/24             169.254.100.1 dst-ip (learned)
> >>>>>               10.0.1.0/24             169.254.100.2 dst-ip (learned)
> >>>>>                 0.0.0.0/0             200.200.200.1 dst-ip
> >>>>>
> >>>>> IPv6 Routes
> >>>>> Route Table <main>:
> >>>>>                      ::/0     fc00:ca5a:ca5a:8000:: dst-ip
> >>>>>
> >>>>>
> >>>>> OVN-IC Global database
> >>>>>
> >>>>> root at ovn-global-db1:~# ovn-ic-sbctl show
> >>>>> availability-zone osp1
> >>>>>     gateway 832b6c0d-13ce-4600-ab37-78516d8ec4c5
> >>>>>         hostname: osp1-gwnode1
> >>>>>         type: geneve
> >>>>>             ip: 192.168.200.28
> >>>>>         port admin-rt1-tenant1
> >>>>>             transit switch: admin-tenant1
> >>>>>             address: ["aa:aa:aa:aa:bb:01 169.254.100.1/24 fe80::1/64"]
> >>>>>         port admin-rt1-tenant1_1
> >>>>>             transit switch: admin-tenant1_1
> >>>>>             address: ["aa:aa:aa:aa:dd:01 169.254.200.1/24"]
> >>>>> availability-zone osp2
> >>>>>     gateway 17ffabdf-cf47-41ab-9539-d326c13c4ca8
> >>>>>         hostname: osp2-gwnode1
> >>>>>         type: geneve
> >>>>>             ip: 192.168.200.128
> >>>>>         port admin-rt2-tenant1
> >>>>>             transit switch: admin-tenant1
> >>>>>             address: ["aa:aa:aa:aa:bb:02 169.254.100.2/24 fe80::2/64"]
> >>>>>         port admin-rt2-tenant1_1
> >>>>>             transit switch: admin-tenant1_1
> >>>>>             address: ["aa:aa:aa:aa:dd:02 169.254.200.2/24"]
> >>>>> availability-zone osp3
> >>>>>     gateway 97595af9-7896-40d0-a883-beadbff1aa5b
> >>>>>         hostname: osp3-gwnode1
> >>>>>         type: geneve
> >>>>>             ip: 192.168.200.228
> >>>>>         port admin-rt3-tenant1
> >>>>>             transit switch: admin-tenant1
> >>>>>             address: ["aa:aa:aa:aa:aa:03 169.254.100.3/24 fe80::3/64"]
> >>>>>         port admin-rt3-tenant1_1
> >>>>>             transit switch: admin-tenant1_1
> >>>>>             address: ["aa:aa:aa:aa:dd:03 169.254.200.3/24"]
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> *‘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’.*
> >>
> >
>
> --
>
>
>
>
> _‘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’.*
>
>
>
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