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Is there a separate document for Train->Ussuri? Maybe the "Ussuri & later (CentOS 8)" text could be a link.

-----Original Message-----
From: Mark Goddard <mark at stackhpc.com> 
Sent: Wednesday, March 17, 2021 4:52 AM
To: Braden, Albert <C-Albert.Braden at charter.com>
Cc: openstack-discuss at lists.openstack.org
Subject: [EXTERNAL] Re: [kolla] Upgrading from Centos7 Train to Centos8 Ussuri

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On Tue, 16 Mar 2021 at 18:54, Braden, Albert
<C-Albert.Braden at charter.com> wrote:
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> I’m testing the Train7->Ussuri8 upgrade on a heat stack, following this document:

Hi Albert,

The procedure takes you from Train on CentOS 7 to Train on CentOS 8. A
Ussuri upgrade would be a separate step. I'll try to make that clearer
in the docs.

Mark

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> OpenStack Docs: CentOS 8
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> I used the instructions here to successfully remove a controller from the cluster:
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> https://docs.openstack.org/kolla-ansible/train/user/adding-and-removing-hosts.html#removing-existing-controllers
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> Now I’m ready to add one, using the instructions here:
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> https://docs.openstack.org/kolla-ansible/train/user/adding-and-removing-hosts.html#adding-new-controllers
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> They say to run bootstrap-servers:
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> kolla-ansible -i <inventory> bootstrap-servers [ --limit <limit> ]
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> The question is, how to run it? My build server is running Centos 7 and has Python 2.7.5. Should I just download Ussuri to my existing build server, or do I need to build a new Centos 8 build server with Python 3?
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> I read the “potential issues” text but it’s not obvious whether it is safe to run Ussuri bootstrap-servers on Train hosts. If I don’t run bootstrap-servers on the Train controllers, then how does the new Ussuri controller get integrated (RMQ, MariaDB, etc.)?
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