On Wed, 2019-06-05 at 13:47 +0100, Mark Goddard wrote:
On Wed, 5 Jun 2019 at 13:28, Emilien Macchi <emilien@redhat.com> wrote:
On Wed, Jun 5, 2019 at 5:21 AM Mark Goddard <mark@stackhpc.com> wrote: [...]
I understand that Tripleo uses buildah to build images already (please correct me if I'm wrong). How is this achieved with kolla? Perhaps using 'kolla-build --template-only' to generate Dockerfiles then invoking buildah separately? Are you planning to work on adding buildah support to kolla itself?
That's what we did indeed, we use Kolla to generate Dockerfiles, then call Buildah from tripleoclient to build containers. We have not planned (yet) to port that workflow to Kolla, which would involve some refacto in the build code (last time I checked).
I wrote a blog post about it a while ago: https://my1.fr/blog/openstack-containerization-with-podman-part-5-image-buil...
Thanks for following up. It wouldn't be a trivial change to add buildah support in kolla, but it would have saved reimplementing the task parallelisation in Tripleo and would benefit others too. Never mind. actully im not sure about that buildah should actully be pretty simple to add support for. its been a while but we looksed at swaping out the building with a python script a few years ago https://review.opendev.org/#/c/503882/ and it really did not take that much to enable so simply invoking buildah in a simlar maner should be trivail.
podman support will be harder but again we confied all interaction with docker in kolla-ansibel to be via https://github.com/openstack/kolla-ansible/blob/master/ansible/library/kolla... so we sould jsut need to write a similar module that would work with podman and then select the correct one to use. the interface is a little large but it shoudld reactively mechanical to implement podman supprot.
-- Emilien Macchi