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[nova][kolla][openstack-ansible][tripleo] Cells v2 upgrades

On Wed, Jun 5, 2019 at 5:16 AM Mark Goddard <mark at> wrote:
> Hi,
> At the recent kolla virtual PTG [1] we had a good discussion about
> adding support for multiple nova cells in kolla-ansible. We agreed a
> key requirement is to be able to perform operations on one or more
> cells without affecting the rest for damage limitation. This also
> seems like it would apply to upgrades. We're seeking input on
> ordering. Looking at the nova upgrade guide [2] I might propose
> something like this:
> 1. DB syncs
> 2. Upgrade API, super conductor
> For each cell:
> 3a. Upgrade cell conductor
> 3b. Upgrade cell computes
> 4. SIGHUP all services

Unfortunately, this is a problem right now:

I sat down at the PTG to settle this down, I was going to finish this
patch up but I didn't get around to it.  That might be an action item
to be able to do this successfully.

> 5. Run online migrations
> At some point in here we also need to run the upgrade check.
> Presumably between steps 1 and 2?
> It would be great to get feedback both from the nova team and anyone
> running cells
> Thanks,
> Mark
> [1]
> [2]

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