[Openstack-operators] [nova] Should we allow passing new user_data during rebuild?

Belmiro Moreira moreira.belmiro.email.lists at gmail.com
Wed Oct 4 15:33:40 UTC 2017

In our cloud rebuild is the only way for a user to keep the same IP.
Unfortunately, we don't offer floating IPs, yet.
Also, we use the user_data to bootstrap some actions in new instances
(puppet, ...).
Considering all the use-cases for rebuild it would be great if the
user_data can be updated at rebuild time.

On Wed, Oct 4, 2017 at 5:15 PM, Chris Friesen <chris.friesen at windriver.com>

> On 10/03/2017 11:12 AM, Clint Byrum wrote:
> My personal opinion is that rebuild is an anti-pattern for cloud, and
>> should be frozen and deprecated. It does nothing but complicate Nova
>> and present challenges for scaling.
>> That said, if it must stay as a feature, I don't think updating the
>> user_data should be a priority. At that point, you've basically created an
>> entirely new server, and you can already do that by creating an entirely
>> new server.
> If you've got a whole heat stack with multiple resources, and you realize
> that you messed up one thing in the template and one of your servers has
> the wrong personality/user_data, it can be useful to be able to rebuild
> that one server without affecting anything else in the stack.  That's just
> a convenience though.
> Chris
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