[openstack-dev] [tripleo] Updates on the TripleO on Kubernetes work

Flavio Percoco flavio at redhat.com
Thu Nov 30 17:03:35 UTC 2017

On 30/11/17 10:23 -0500, Dan Prince wrote:
>On Fri, Nov 17, 2017 at 4:43 AM, Steven Hardy <shardy at redhat.com> wrote:
>> In the ansible/kubernetes model, it could work like:
>> 1. Ansible role makes k8s API call creating pod with multiple containers
>> 2. Pod starts temporary container that runs puppet, config files
>> written out to shared volume
>> 3. Service container starts, config consumed from shared volume
>> 4. Optionally run temporary bootstrapping container inside pod
>> This sort of pattern is documented here:
>> https://kubernetes.io/docs/tasks/access-application-cluster/communicate-
>> containers-same-pod-shared-volume/
>Regarding the use of the shared volume I agree this is a nice iteration. We
>considered using it within Pike as well but due to the Hybrid nature of the
>deployment, and the desire to have config files easily debug friendly on
>the host itself we ended up not going there.
>In Queens however we are aiming for more or less full containerization so
>we could consider the merits of this approach again. Just pointing out that
>I don't think Kubernetes is a requirement in order to be able to proceed
>with some of this improvement.

Agreed! The sooner we can move things out of "host paths" the better! Kubernetes
is not a requirement for these improvements but, I would say they are a
requirement for a k8s based deployment.

That is to say, a k8s based deployment should not depend on hostpaths :)


Flavio Percoco
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