I've been working with mjturek and baha on this a bit. I've responded inline
below, but also want to clarify on the desired workflow.
TL;DR: The desired workflow is to have ppc64le and x86_64 seamlessly integrated and
uploaded. This can be done with docker manifest list images.
The following link explains in greater detail:
https://docs.docker.com/registry/spec/manifest-v2-2/
The process boils down to the following steps:
1) Upload an image of the first architecture (ex: image1:x86_64_01012019)
2) Upload an image of the second architecture (ex: image1:ppc64le_01012019)
3) Upload manifest list image of the image (ex: image1:01012019)
Step 3 is essentially just pushing a JSON body that has descriptors and references to the
other two images, such that when someone does a pull request of the manifest list image,
it will gather the appropriate architecture for that image based on the host's
architecture.
-Trevor
PS. If I've missed something important with the overall concerns here I apologize, but
thought it necessary to spell out the goal as I understand it.
On Mar 21, 2019, at 12:28 PM, Javier Pena <jpena(a)redhat.com>
wrote:
----- Original Message -----
> Hi all,
>
> Over the last few weeks, mjturek and baha have been busy working on a set of
> periodic jobs to build TripleO images for the ppc64le arch [1].
>
> The current missing step is publishing those images, and they are proposing
> to push those to the RDO Registry instance at
registry.rdoproject.org, just
> like we do with our TripleO images. I have tried to understand the
> requirements, and would like to get input on the following topics:
>
> - Which namespace would these images use? Based on some logs [2] it looks
> like they use tripleomaster-ppc64le, will they also push the images to that
> namespace?
I have no experience in namespaces inside of a registry or how that differentiates images
from one another, but the images should be pushed (in my opinion) to the same location in
which the x86 images reside.
> - Could this create any conflicts with our current promotion
pipeline?
This should not cause conflicts in current promotion pipeline, as the process should be an
extension to existing functionality.
> - Is registry.rdo the right place for those images? I'm not
familiar with the
> next steps for ppc64le images after that (will it then go through a
> promotion pipeline?), so that might affect.
If the x86 images exist in registry.rdo, then the ppc64le (and any other architecture
image) should exist there as well. I can't think of a reason to differentiate between
architectures when the desired result is parity and support of more architectures.
>
> If we decide to upload the images to images.rdo, we'll need to do the
Correction: this should read "registry.rdo"
> following:
>
> - Create the tripleomaster-ppc64le namespace in registry.rdo, following a
> similar pattern to [3].
> - Schedule a short registry downtime to increase its disk space, since it is
> currently near its limit.
This is definitely necessary, given the capacity requirement will double, give or take, to
support the additional architecture.
> - Update the job at ci.centos to include the REGISTRY_PASSWORD
environment
> variable with the right token (see [4]). This is missing today, and causing
> the job failure.
>
> Once we get input from all interested parties, we will decide on the next
> steps.
>
> Thanks,
> Javier
>
>
> [1] -
>
https://ci.centos.org/job/tripleo-upstream-containers-build-master-ppc64le/
> [2] -
>
https://centos.logs.rdoproject.org/tripleo-upstream-containers-build-mast...
> [3] -
https://review.rdoproject.org/r/19063
> [4] -
>
https://github.com/rdo-infra/review.rdoproject.org-config/blob/master/pla...
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