[Rdo-list] [rhos-list] Openstack Grizzly upgrade to Havana

Tim Bell Tim.Bell at cern.ch
Mon Oct 21 18:28:27 UTC 2013

Any idea how cells would fit into this ?

Trying to work out the upgrade order for the Nova API cells vs the compute cells is one of our open questions....


> -----Original Message-----
> From: Dan Smith [mailto:dansmith at redhat.com]
> Sent: 21 October 2013 20:23
> To: Tim Bell; Diogo Vieira
> Cc: Perry Myers; rdo-list
> Subject: Re: [Rdo-list] [rhos-list] Openstack Grizzly upgrade to Havana
> > Thanks for this effort. I'd fully support the public wiki page as it
> > allows for explanations and incremental improvements along with the
> > script.
> Yeah, I definitely need to get that up :)
> > Have you had a look at what it would take to do a rolling upgrade
> > rather than down all the services ?
> Yeah. So, Lars just wrote back about the service-by-service approach, which also works well and provides smaller downtime gaps and
> fewer "committed" components during the upgrade if something goes wrong.
> Further, it also lets you upgrade everything except nova, and then deploy a new havana nova cluster that shares resources with the still-
> on-grizzly deployment. With that, you can slowly migrate your instances to the new nova deployment, growing that deployment as nodes
> become vacated from the old one, eventually deprecating the old one completely. That offers tenant, credential, image, and volume
> continuity across the upgrade, as well as a much larger timeframe to migrate everything, other than just "nova is down, move
> everything!!" :)
> To me, "rolling upgrades" means something else, which I think is probably what you're referring to. My upstream work right now is
> targeted at making sure that we can upgrade nova components individually without needing the parallel nova deployment above. We're
> getting ever closer to this being a reality, and I _hope_ we will start gating on "not breaking live upgrades" in the Icehouse or J
> timeframes.
> --Dan

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