Incoming Breaking Changes at the Series Boundary for ETCD

[Matt Bruzek]

Chuck,

I am plus one for introducing the new etcd charm in the Xenial series (on
release boundary). There have been enough features added and things changed
that both versions have diverged quite a bit. I am excited to get the new
etcd charm into other people's hands so publish it soon.

   - Matt Bruzek <matthew.bruzek at canonical.com>

On Tue, Aug 2, 2016 at 11:07 AM, Charles Butler <
charles.butler at canonical.com> wrote:

> Greetings,
>
> *TL;DR *- There will be no upgrade path due to incompatible changes from
> cs:trusty/etcd to cs:xenial/etcd. Please be prepared for re-deployment if
> an upgrade is required.
>
> As some of you may know, we have been toiling quite hard on the Etcd charm
> this last month, adding TLS encryption for an "SSL Everywhere" experience.
> Read: End to End encryption on our Kubernetes bundle.
>
> This brought with it a lot of upgrade concerns, and we have not yet landed
> the changes in the stable channel. This was by design so we could evaluate
> the potential impact on existing clusters of Etcd deployed with Juju. It's
> become quite apparent to us that there is a very convoluted upgrade path.
> And this upgrade path is a one-time scenario, that will require an
> engineering effort that doesn't cover its use.
>
> With that being said, we're now settled on breaking compatibility on the
> series boundary of Xenial forward. Meaning when you deploy etcd from Xenial
> onward, TLS will be enabled by default, and we are dropping trusty as a
> supported series moving forward.
>
> This leaves users of the older etcd charm(s) in a very well understood
> behavior, and they will not be prompted for an update that would
> potentially break their existing deployments.
>
> We wanted the community to be well aware of the plan moving forward so
> there are no surprises, and will continue to strive towards a stellar user
> experience.
>
> If you have any questions, comments or concerns, please feel free to reply
> to this thread and continue the conversation.
>
> All the best,
>
>  Charles
> --
> Juju Charmer
> Canonical Group Ltd.
> Ubuntu - Linux for human beings | www.ubuntu.com
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>
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