Open Stack

Hi Nguy,

We’ve deployed a large multi-region openstack deployment.
As a rule of thumb we’ve got a “keystone” region which is as best we can highly available and very redundant.

We then have all other regions talk back to this region, we just usually call it “keystone” or “core” and it’s hidden from the UI from users.

We then just run a large well kept Galara cluster to support it.

--Karl.

From: openstack-discuss-request at lists.openstack.org <openstack-discuss-request at lists.openstack.org>
Date: Tuesday, 18 July 2023 at 9:25 pm
To: openstack-discuss at lists.openstack.org <openstack-discuss at lists.openstack.org>
Subject: openstack-discuss Digest, Vol 57, Issue 55
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Today's Topics:

   1. [openstack][largescale-sig] Openstack multi region deployment
      (Nguy?n H?u Kh?i)
   2. Re: [openstack][largescale-sig] Openstack multi region
      deployment (Felix Huettner)
   3. Re: [openstack][largescale-sig] Openstack multi region
      deployment (Nguy?n H?u Kh?i)
   4. Re: [neutron] unmanaged router resources - OVN interconnect
      (Rodolfo Alonso Hernandez)


----------------------------------------------------------------------

Message: 1
Date: Tue, 18 Jul 2023 12:07:12 +0700
From: Nguy?n H?u Kh?i <nguyenhuukhoinw at gmail.com>
To: OpenStack Discuss <openstack-discuss at lists.openstack.org>
Subject: [openstack][largescale-sig] Openstack multi region deployment
Message-ID:
        <CABAODReJ6QW8A4OENEjmhFCiM-15B0qc2La_aMr1EKfaENq9iw at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hello guys,

I am going to deploy openstack multi regions and I know that keystone
replication is the most challenging.

I plan to set up 2 regions which use centralize galera cluster(3 nodes).
and one standby edge galera cluster(3 nodes)

When region 1 is node available, I will map region 2 to use standby edge
galera cluster.

I hope  you give me some experience and advice with multi regions.

Thank you very much.
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Message: 2
Date: Tue, 18 Jul 2023 09:34:35 +0200
From: Felix Huettner <felix.huettner at mail.schwarz>
To: Nguy?n H?u Kh?i <nguyenhuukhoinw at gmail.com>
Cc: OpenStack Discuss <openstack-discuss at lists.openstack.org>
Subject: Re: [openstack][largescale-sig] Openstack multi region
        deployment
Message-ID: <ZLZAS-99RzzXfyr8 at SIT-SLAP8639.int.lidl.net>
Content-Type: text/plain; charset=utf-8

Hi,

i think you have two options here:
1. you could span a single galera cluster over all of your regions.
   this might have some latency issues, but if your are not too write
   heavy that might be fine. I know some companies use that setup.
2. you use some kind of multiple galera clusters with replication.
   But i have not yet heard of anybody using this setup.

An alternative might be to have separate keystone setups with separate
databases. This would probably reduce the error potential, but might not
fit your usecase.

Thanks
Felix


On Tue, Jul 18, 2023 at 12:07:12PM +0700, Nguy?n H?u Kh?i wrote:
> Hello guys,
>
> I am going to deploy openstack multi regions and I know that keystone
> replication is the most challenging.
>
> I plan to set up 2 regions which use centralize galera cluster(3 nodes).
> and one standby edge galera cluster(3 nodes)
>
> When region 1 is node available, I will map region 2 to use standby edge
> galera cluster.
>
> I hope  you give me some experience and advice with multi regions.
>
> Thank you very much.
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------------------------------

Message: 3
Date: Tue, 18 Jul 2023 15:36:11 +0700
From: Nguy?n H?u Kh?i <nguyenhuukhoinw at gmail.com>
To: Nguy?n H?u Kh?i <nguyenhuukhoinw at gmail.com>, OpenStack Discuss
        <openstack-discuss at lists.openstack.org>
Subject: Re: [openstack][largescale-sig] Openstack multi region
        deployment
Message-ID:
        <CABAODRcJr=CGBW1_bRkLQJAxLZxAx8V4qvbdBmTUQBUm2SRsow at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Hi.
Thank you for your reply.

The first one has a problem because each region is too soft. If a member is
down, so this region is gone.

It is so challenge with us.


Nguyen Huu Khoi


On Tue, Jul 18, 2023 at 2:34?PM Felix Huettner <felix.huettner at mail.schwarz>
wrote:

> Hi,
>
> i think you have two options here:
> 1. you could span a single galera cluster over all of your regions.
>    this might have some latency issues, but if your are not too write
>    heavy that might be fine. I know some companies use that setup.
> 2. you use some kind of multiple galera clusters with replication.
>    But i have not yet heard of anybody using this setup.
>
> An alternative might be to have separate keystone setups with separate
> databases. This would probably reduce the error potential, but might not
> fit your usecase.
>
> Thanks
> Felix
>
>
> On Tue, Jul 18, 2023 at 12:07:12PM +0700, Nguy?n H?u Kh?i wrote:
> > Hello guys,
> >
> > I am going to deploy openstack multi regions and I know that keystone
> > replication is the most challenging.
> >
> > I plan to set up 2 regions which use centralize galera cluster(3 nodes).
> > and one standby edge galera cluster(3 nodes)
> >
> > When region 1 is node available, I will map region 2 to use standby edge
> > galera cluster.
> >
> > I hope  you give me some experience and advice with multi regions.
> >
> > Thank you very much.
> Diese E Mail enth?lt m?glicherweise vertrauliche Inhalte und ist nur f?r
> die Verwertung durch den vorgesehenen Empf?nger bestimmt.
> Sollten Sie nicht der vorgesehene Empf?nger sein, setzen Sie den Absender
> bitte unverz?glich in Kenntnis und l?schen diese E Mail.
>
> Hinweise zum Datenschutz finden Sie hier<https://www.datenschutz.schwarz>.
>
>
> This e-mail may contain confidential content and is intended only for the
> specified recipient/s.
> If you are not the intended recipient, please inform the sender
> immediately and delete this e-mail.
>
> Information on data protection can be found here<
> https://www.datenschutz.schwarz><https://www.datenschutz.schwarz%3e>.
>
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Message: 4
Date: Tue, 18 Jul 2023 13:23:27 +0200
From: Rodolfo Alonso Hernandez <ralonsoh at redhat.com>
To: Roberto Bartzen Acosta <roberto.acosta at luizalabs.com>
Cc: openstack-discuss <openstack-discuss at lists.openstack.org>,  Terry
        Wilson <twilson at redhat.com>, Tiago Pires <tiago.pires at luizalabs.com>
Subject: Re: [neutron] unmanaged router resources - OVN interconnect
Message-ID:
        <CAECr9X7U7YsGBv9ajcmeOCxfdD+YLar8QyPwYBN0qaP10CzTug at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Ok, this is being tortuous. First of all: define a strategy. If you are
going to create the resources in Neutron, define how. I've provided a way
to do this, find a formal strategy to ground it.

Second: (again) try to find a connection between resources, if you are
going to use the strategy of creating the resources in Neutron. The
"Logical_Router_Static_Route" belongs to a router univocally. If that
router has been created by OpenStack, then you can modify the DB sync
method to consider learned routes too.

In order to do this, you'll need a set of resources that are going to be
needed in Neutron, the OVN counterparts and other resources (like
"Logical_Router_Static_Route") that will be added and will be present in
OVN and not in Neutron DB. Also you'll need to know how to relate all of
them.
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