Open Stack

On 11/11/2016 9:45 AM, Jay Pipes wrote:
> On 11/11/2016 08:38 AM, William Josefsson wrote:
>> Hi everyone, I have been quite concerned about how to migrate 50
>> projects and total 100 instances on Liberty/CentOS72, to Newton.
>>
>> My storage backend is CEPH. Can anyone advice if I can as a safe
>> migration path, do a fresh install of Newton on additional hardware.
>> The new Newton cluster connecting to same old DB and Storage(CEPH
>> cluster). And then live-migrate to the new hardware?
>>
>> Please advice if this approach works. Thx will
>
> The only safe and supported way to upgrade OpenStack is to do an N-1 to
> N upgrade.
>
> Upgrade your controller installation to Mitaka, run your migrations (DB
> and online data migrations) then upgrade all of your nova-compute nodes
> one by one from Liberty to Mitaka. You will not need to live-migrate any
> workloads unless you simultaneously want to upgrade either the operating
> system or the libvirt/QEMU versions on the nova-computes.
>
> Rinse and repeat to get to Newton.
>
> There's many guides online for how to do upgrades of OpenStack. Please
> follow one of them to perform a best practice N-1 to N upgrade.
>
> Best,
> -jay
>
>
>
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>

The nova docs on rolling upgrades were also recently updated:

http://docs.openstack.org/developer/nova/upgrade.html#minimal-downtime-upgrade-process

-- 

Thanks,

Matt Riedemann