Open Stack

Hello,

sorry I could not make it to the PTG.

I have an idea that I want to share with the community. I hope this is a
good place to start the discussion.

After years of Openstack operations, upgrading releases from Icehouse to
Newton, the feeling is that the control plane upgrade is doable.

But it is also a lot of pain to upgrade all the compute nodes. This
really causes downtime to the VMs that are running.
I can't always make live migrations, sometimes the VMs are just too big
or too busy.

It would be nice to guarantee the ability to run an updated control
plane with compute nodes up to N-3 Release.

This way even if we have to upgrade the control plane every 6 months, we
can keep a longer lifetime for compute nodes. Basically we can never
upgrade them until we decommission the hardware.

If there are new features that require updated compute nodes, we can
always organize our datacenter in availability zones, not scheduling new
VMs to those compute nodes.

To my understanding this means having compatibility at least for the
nova-compute agent and the neutron-agents running on the compute node.

Is it a very bad idea ?

Do other people feel like me that upgrading all the compute nodes is
also a big part of the burden regarding the upgrade ?

thanks !

Saverio


On 28.09.17 17:38, Arkady.Kanevsky at dell.com wrote:
> Erik,
> 
> Thanks for setting up a session for it.
> 
> Glad it is driven by Operators.
> 
> I will be happy to work with you on the session and run it with you.
> 
> Thanks,
> 
> Arkady
> 
>  
> 
> *From:*Erik McCormick [mailto:emccormick at cirrusseven.com]
> *Sent:* Thursday, September 28, 2017 7:40 AM
> *To:* Lee Yarwood <lyarwood at redhat.com>
> *Cc:* OpenStack Development Mailing List
> <openstack-dev at lists.openstack.org>; openstack-operators
> <openstack-operators at lists.openstack.org>
> *Subject:* Re: [openstack-dev] [Openstack-operators]
> [skip-level-upgrades][fast-forward-upgrades] PTG summary
> 
>  
> 
>  
> 
> On Sep 28, 2017 4:31 AM, "Lee Yarwood" <lyarwood at redhat.com
> <mailto:lyarwood at redhat.com>> wrote:
> 
>     On 20-09-17 14:56:20, Arkady.Kanevsky at dell.com
>     <mailto:Arkady.Kanevsky at dell.com> wrote:
>     > Lee,
>     > I can chair meeting in Sydney.
>     > Thanks,
>     > Arkady
> 
>     Thanks Arkady!
> 
>     FYI I see that emccormickva has created the following Forum session to
>     discuss FF upgrades:
> 
>     http://forumtopics.openstack.org/cfp/details/19
> 
>     You might want to reach out to him to help craft the agenda for the
>     session based on our discussions in Denver.
> 
> .
> 
> I just didn't want to risk it not getting in, and it was on our etherpad
> as well. I'm happy to help, but would love for you guys to lead.
> 
>  
> 
> Thanks,
> 
> Erik
> 
>  
> 
> 
>     Thanks again,
> 
>     Lee
> 
>     --
>     Lee Yarwood                 A5D1 9385 88CB 7E5F BE64  6618 BCA6 6E33
>     F672 2D76
> 
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> 
>  
> 
> 
> 
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