Open Stack

Thanks for your feedback

I missed to say that during the fast forward update,  all OpenStack
services would be down
So, during the db-syncs on the first controller, all services on the second
controller (but also on the compute nodes) would be down

The update of nova and neutron on the compute nodes would be done in the
step:

 "Update of the compute nodes from Ubuntu 20.04 Ussuri to Ubuntu 22.04 Yoga
(update OpenStack and Ubuntu packages)"


Cheers, Massimo

On Tue, Dec 6, 2022 at 10:34 AM Dmitriy Rabotyagov <noonedeadpunk at gmail.com>
wrote:

> Hi Massimo,
>
> Assuming you have manual installation (not using any deployment
> projects), I have several comments on your plan.
>
> 1. I've missed when you're going to upgrade Nova/Neutron on computes.
> As you should not create a gap in OpenStack versions between
> controllers and computes since nova-scheduler has a requirement on RPC
> version computes will be using. Or, you must define the rpc version
> explicitly in config to have older computes (but it's not really a
> suggested way).
> 2. Also once you do db sync, your second controller might misbehave
> (as some fields could be renamed or new tables must be used), so you
> will need to disable it from accepting requests until syncing
> openstack version as well. If you're not going to upgrade it until
> getting first one to Yoga - it should be disabled all the time until
> you get Y services running on it.
> 3. It's totally fine to run multi-distro setup. For computes the only
> thing that can go wrong is live migrations, and that depends on
> libvirt/qemu versions. I'm not sure if CentOS 8 Stream have compatible
> version with Ubuntu 22.04 for live migrations to work though, but if
> you care about them (I guess you do if you want to migrate workloads
> semalessly) - you'd better check. But my guess would be that CentOS 8
> Stream should have compatible versions with Ubuntu 20.04 - still needs
> deeper checking.
>
> вт, 6 дек. 2022 г. в 09:40, Massimo Sgaravatto <
> massimo.sgaravatto at gmail.com>:
> >
> > Any comments on these questions ?
> > Thanks, Massimo
> >
> > On Fri, Dec 2, 2022 at 5:02 PM Massimo Sgaravatto <
> massimo.sgaravatto at gmail.com> wrote:
> >>
> >> Dear all
> >>
> >>
> >>
> >> Dear all
> >>
> >> We are now running an OpenStack deployment: Yoga on CentOS8Stream.
> >>
> >> We are now thinking about a possible migration to Ubuntu for several
> reasons in particular:
> >>
> >> a- 5 years support for both the Operating System and OpenStack
> (considering LTS releases)
> >> b- Possibility do do a clean update between two Ubuntu LTS releases
> >> c- Easier procedure (also because of b) for fast forward updates (this
> is what we use to do)
> >>
> >> Considering the latter item, my understanding is that an update from
> Ubuntu 20.04 Ussuri to Ubuntu 22.04 Yoga could be done in the following
> >> way (we have two controller nodes and n compute nodes):
> >>
> >> - Update of first controller node from Ubuntu 20.04 Ussuri to Ubuntu
> 20.04 Victoria (update OpenStack packages + dbsync)
> >> - Update of first controller node from Ubuntu 20.04 Victoria to Ubuntu
> 20.04 Wallaby (update OpenStack packages + dbsync)
> >> - Update of first controller node from Ubuntu 20.04 Wallaby to Ubuntu
> 20.04 Xena (update OpenStack packages + dbsync)
> >> - Update of first controller node from Ubuntu 20.04 Xena to Ubuntu
> 20.04 Yoga (update OpenStack packages + dbsync)
> >> - Update of first controller node from Ubuntu 20.04 Yoga to Ubuntu
> 22.04 Yoga (update Ubuntu  packages)
> >> - Update of second controller node from Ubuntu 20.04 Ussuri to Ubuntu
> 22.04 Yoga (update OpenStack and Ubuntu packages)
> >> - Update of the compute nodes from Ubuntu 20.04 Ussuri to Ubuntu 22.04
> Yoga (update OpenStack and Ubuntu packages)
> >>
> >>
> >> We would do the same when migrating from Ubuntu 22.04 Yoga to Ubuntu
> 24.04 and the OpenStack xyz release (where xyz
> >> is the LTS release used in Ubuntu 24.04)
> >>
> >> Is this supposed to work or am I missing something ?
> >>
> >> If we decide to migrate to Ubuntu, the first step would be the
> reinstallation with Ubuntu 22.04/Yoga of each node
> >> currently running CentOS8 stream/Yoga.
> >> I suppose there are no problems having in the same OpenStack
> installation nodes running the same
> >> Openstack version but different operating systems, or am I wrong ?
> >>
> >> Thanks, Massimo
> >>
>
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