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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: