Open Stack

Hi Christian,

I documented this a few months ago here: https://www.jimmdenton.com/migrating-lxb-to-ovn/. It’s heavily geared towards OpenStack-Ansible, but you can probably extrapolate the steps for a vanilla deployment or other deployment tool. The details will vary. Highly recommend testing this in a lab environment that mirrors production, if possible.

--
James Denton
Principal Architect
Rackspace Private Cloud - OpenStack
james.denton at rackspace.com

From: Christian Rohmann <christian.rohmann at inovex.de>
Date: Wednesday, November 23, 2022 at 4:27 AM
To: James Denton <james.denton at rackspace.com>, Slawek Kaplonski <skaplons at redhat.com>, openstack-discuss at lists.openstack.org <openstack-discuss at lists.openstack.org>
Subject: Re: [neutron] Switching the ML2 driver in-place from linuxbridge to OVN for an existing Cloud
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Hey James,

I am really sorry I just get back to you now.

On 29/08/2022 19:54, James Denton wrote:

In my experience, it is possible to perform in-place migration from ML2/LXB -> ML2/OVN, albeit with a shutdown or hard reboot of the instance(s) to complete the VIF plugging and some other needed operations. I have a very rough outline of required steps if you’re interested, but they’re geared towards an openstack-ansible based deployment. I’ll try to put a writeup together in the next week or two demonstrating the process in a multi-node environment; the only one I have done recently was an all-in-one.

James Denton
Rackspace Private Cloud



Thanks for replying, I'd really love to see your outline / list of steps. BTW, we are actively working on switching to openstack-ansible - so that would suit us well.
We also came to the conclusion that a shutdown of all instances might be required. Question is, if that has to happen instantly or if one could do that on a project by project base.
Our cloud is small enough to still make this feasible, but I suppose this topic is or will become more important  to other, larger clouds as well.



Regards



Christian
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