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[charms][watcher] OpenStack Watcher Charm

Dropping direct recipients as this causes a reject from openstack-discuss!

On Fri, Jan 10, 2020 at 11:12 AM James Page < at>

> Hi Stamatis
> Thankyou for this work!
> I'll take a look at your charm over the next few days.
> On Wed, Jan 8, 2020 at 11:25 AM Stamatis Katsaounis <
> skatsaounis at> wrote:
>> Hi all,
>> Purpose of this email is to let you know that we released an unofficial
>> charm of OpenStack Watcher [1]. This charm gave us the opportunity to
>> deploy OpenStack Watcher to our charmed OpenStack deployment.
>> After seeing value in it, we decided to publish it through GRNET GitHub
>> Organization account for several reasons. First of all, we would love to
>> get feedback on it as it is our first try on creating an OpenStack reactive
>> charm. Secondly, we would be glad to see other OpenStack operators deploy
>> Watcher and share with us knowledge on the project and possible use cases.
>> Finally, it would be ideal to come up with an official OpenStack Watcher
>> charm repository under charmers umbrella. By doing this, another OpenStack
>> project is going to be available not only for Train version but for any
>> future version of OpenStack. Most important, the CI tests are going to
>> ensure that the code is not broken and persuade other operators to use it.
>> Before closing my email, I would like to give some insight on the
>> architecture of the code base and the deployment process. To begin with,
>> charm-watcher is based on other reactive OpenStack charms. During its
>> deployment Barbican, Designate, Octavia and other charms' code bases were
>> counseled. Furthermore, the structure is the same as any official OpenStack
>> charm, of course without functional tests, which is something we cannot
>> provide.
> I'd suggest that we initiate the process to include your watcher charm as
> part of the OpenStack Charmers project on; once the initial
> migration completes adding some functional tests should be fairly easy as
> you'll be able to run them on the Canonical 3rd party CI infrastructure.
> This requires that a couple of reviews be raised - here are examples for
> the new Manila Ganesha charms:
> One is for the infrastructure setup, the other is to formally include the
> repositories as part of the TC approved project.  If you would like to
> raise them for the watcher charm I'm happy to review with Frode (who is the
> current PTL).
>> Speaking about the deployment process, apart from having a basic charmed
>> OpenStack deployment, operator has to change two tiny configuration options
>> on Nova cloud controller and Cinder. As explained in the Watcher
>> configuration guide, special care has to be done with Oslo notifications
>> for Nova and Cinder [2]. In order to achieve that in charmed OpenStack some
>> issues were met and solved with the following patches [3], [4], [5], [6].
>> With these patches, operator can set the extra Oslo configuration and this
>> is the only extra configuration needs to take place. Finally, with [7]
>> Keystone charm can accept a relation with Watcher charm instead of ignoring
>> it.
>> To be able to deploy GRNET Watcher charm on Train, patches [3], [4], [5]
>> and [7] have to be back-ported to stable/19.10 branch but that will require
>> the approval of charmers team. Please let me know if such an option is
>> available and in that case I am going to open the relevant patches.
>> Furthermore, if you think that it could be a good option to create a spec
>> and then introduce an official Watcher charm, I would love to help on that.
> I'd rather we wait until the 20.02 charm release - dependent changes have
> all landed and will be included.
> I wish all a happy new year and I am looking forward to your response and
>> possible feedback.
> Happy new year to you as well!
> PS. If we could have an Ubuntu package for watcher-dashboard [8] like
>> octavia-dashboard [9] we would release a charm for it as well.
> I'll chat with coreycb and see if we might be able to package that for
> 20.04/Ussuri.
> Cheers
> James
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