[openstack-dev] [TripleO] Let's use Ansible to deploy OpenStack services on Kubernetes

Bogdan Dobrelya bdobreli at redhat.com
Fri Jul 14 15:26:27 UTC 2017

On 14.07.2017 11:17, Flavio Percoco wrote:
> Greetings,
> As some of you know, I've been working on the second phase of TripleO's
> containerization effort. This phase if about migrating the docker based
> deployment onto Kubernetes.
> These phase requires work on several areas: Kubernetes deployment,
> OpenStack
> deployment on Kubernetes, configuration management, etc. While I've been
> diving
> into all of these areas, this email is about the second point, OpenStack
> deployment on Kubernetes.
> There are several tools we could use for this task. kolla-kubernetes,
> openstack-helm, ansible roles, among others. I've looked into these
> tools and
> I've come to the conclusion that TripleO would be better of by having
> ansible
> roles that would allow for deploying OpenStack services on Kubernetes.
> The existing solutions in the OpenStack community require using Helm.
> While I
> like Helm and both, kolla-kubernetes and openstack-helm OpenStack
> projects, I
> believe using any of them would add an extra layer of complexity to
> TripleO,

It's hard to estimate that complexity w/o having a PoC of such an
integration. We should come up with a final choice once we have it done.

My vote would go for investing engineering resources into solutions that
have problems already solved, even by the price of added complexity (but
that sort of depends...). Added complexity may be compensated with
removed complexity (like those client -> Mistral -> Heat -> Mistral ->
Ansible manipulations discussed in the mail thread mentioned below [0])

> which is something the team has been fighting for years years -
> especially now
> that the snowball is being chopped off.
> Adopting any of the existing projects in the OpenStack communty would
> require
> TripleO to also write the logic to manage those projects. For example,
> in the
> case of openstack-helm, the TripleO team would have to write either ansible
> roles or heat templates to manage - install, remove, upgrade - the
> charts (I'm
> happy to discuss this point further but I'm keepping it at a high-level on
> purpose for the sake of not writing a 10k-words-long email).
> James Slagle sent an email[0], a couple of days ago, to form TripleO plans
> around ansible. One take-away from this thread is that TripleO is adopting
> ansible more and more, which is great and it fits perfectly with the
> conclusion
> I reached.
> Now, what this work means is that we would have to write an ansible role
> for
> each service that will deploy the service on a Kubernetes cluster.
> Ideally these
> roles will also generate the configuration files (removing the need of
> puppet
> entirely) and they would manage the lifecycle. The roles would be
> isolated and
> this will reduce the need of TripleO Heat templates. Doing this would give
> TripleO full control on the deployment process too.
> In addition, we could also write Ansible Playbook Bundles to contain
> these roles
> and run them using the existing docker-cmd implementation that is coming
> out in
> Pike (you can find a PoC/example of this in this repo[1]).
> Now, I do realize the amount of work this implies and that this is my
> opinion/conclusion. I'm sending this email out to kick-off the
> discussion and
> gather thoughts and opinions from the rest of the community.
> Finally, what I really like about writing pure ansible roles is that
> ansible is
> a known, powerfull, tool that has been adopted by many operators
> already. It'll
> provide the flexibility needed and, if structured correctly, it'll allow
> for
> operators (and other teams) to just use the parts they need/want without
> depending on the full-stack. I like the idea of being able to separate
> concerns
> in the deployment workflow and the idea of making it simple for users of
> TripleO
> to do the same at runtime. Unfortunately, going down this road means
> that my
> hope of creating a field where we could collaborate even more with other
> deployment tools will be a bit limited but I'm confident the result
> would also
> be useful for others and that we all will benefit from it... My hopes
> might be a
> bit naive *shrugs*
> Flavio
> [0]
> http://lists.openstack.org/pipermail/openstack-dev/2017-July/119405.html
> [1] https://github.com/tripleo-apb/tripleo-apbs
> -- 
> @flaper87
> Flavio Percoco
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Best regards,
Bogdan Dobrelya,
Irc #bogdando

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