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I'm testing the Train7->Ussuri8 upgrade on a heat stack, following this document:

OpenStack Docs: CentOS 8<https://docs.openstack.org/kolla-ansible/train/user/centos8.html#migrating-from-centos-7-to-centos-8>

I used the instructions here to successfully remove a controller from the cluster:

https://docs.openstack.org/kolla-ansible/train/user/adding-and-removing-hosts.html#removing-existing-controllers

Now I'm ready to add one, using the instructions here:

https://docs.openstack.org/kolla-ansible/train/user/adding-and-removing-hosts.html#adding-new-controllers

They say to run bootstrap-servers:

kolla-ansible -i <inventory> bootstrap-servers [ --limit <limit> ]

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?

I read the "potential issues<https://docs.openstack.org/kolla-ansible/train/reference/deployment-and-bootstrapping/bootstrap-servers.html#rebootstrapping>" 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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