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On 3/4/18 10:29 PM, Emilien Macchi wrote:
> The use case that I'm working on right now is the following:
> 
>    As an operator, I would like to upgrade my non-containerized 
> undercloud running on Queens to a containerized undercloud running on Rocky.
>    Also, I would like to maintain the exact same command to upgrade my 
> undercloud, which is: openstack undercloud upgrade (with --use-heat to 
> containerize it).
> 
> The work has been tracked here:
> https://trello.com/c/nFbky9Uk/5-upgrade-support-from-instack-undercloud
> 
> But here's an update and some open discussion before we continue to make 
> progress.
> 
> ## Workflow
> 
> This is what I've found the easiest to implement and maintain:
> 
> 1) Update python-tripleoclient-* and tripleo-heat-templates.

Just a note that those need to be installed first, though you have this 
covered 
https://review.openstack.org/#/c/549624/7/tripleoclient/v1/undercloud.py@100

> 2) Run openstack overcloud container prepare.
> 3) Run openstack undercloud upgrade --use-heat, that underneath will: 
> stop non-containerized services, upgrade all packages & dependencies and 
> deploy a containerized undercloud.

As we have discussed and you noted for 
https://review.openstack.org/#/c/549609/ we're better off changing the 
workflow to run the upgrade_tasks so we avoid code duplication.

> 
> Note: the data isn't touched, so when the upgrade is done, the 
> undercloud is just upgraded to Rocky, and containerized.
> 
> ## Blockers encountered
> 
> 1) Passwords were re-generated during the containerization, will be 
> fixed by: https://review.openstack.org/#/c/549600/
> 2) Neutron DB name was different in instack-undercloud. DB will be 
> renamed by https://review.openstack.org/#/c/549609/
> 3) Upgrade logic will live in tripleoclient: 
> https://review.openstack.org/#/c/549624/ (note that it's small)
> 
> ## Testing
> 
> I'm using https://review.openstack.org/#/c/549611/ for testing but I'm 
> also deploying in my local environment. I've been upgrading Pike to 
> Queens successfully, when applying my patches.
> 
> ## Roadmap
> 
> I would like us to solve the containerized undercloud upgrade case by 
> rocky-m1, and have by the end of m1 a CI job that actually test the 
> operator workflow.
> 
> 
> I'll need some feedback, reviews on the proposal & reviews.
> Thanks in advance,
> -- 
> Emilien Macchi
> 
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-- 
Best regards,
Bogdan Dobrelya,
Irc #bogdando