Put copy of ceph docker image on mirror to improve CI

[John Fulton]

The DockerCephDaemonImage (ceph/daemon:tag-build-master-jewel-centos-7) is hosted on docker.io, like other Kolla images. However, for TripleO CI there is a mirror of Kolla images to make CI more efficient. The DockerCephDaemonImage could be added to the mirror too.

[1] https://docs.openstack.org/tripleo-docs/latest/install/advanced_deployment/ceph_config.html#deploying-an-overcloud-with-ceph

[wes hayutin (weshayutin)]

any content from docker.io is cached by the openstack infrastructure.
Thanks :)

[John Fulton (jfulton-org)]

As per a conversation w/ Wes, the "mirror of Kolla images" isn't really an accurate description.
When jobs like scenario001 run the images are pulled, by the undercloud, from docker.io. This is the case for openstack images and ceph images. Those images are set up on the undercloud as a local registry for the overcloud deploy. OpenStack infra may have a cache between docker.io and that local undercloud and that same cache would benefit the ceph image as it would the openstack images.

From the image building point of view images are built at RDO from a job, e.g.

https://review.rdoproject.org/jenkins/job/periodic-tripleo-centos-7-master-containers-build/695

which is something close to our own cache but only for the purposes of building openstack images. Ultimately they end up back on docker.io for the process described above.

So, AFAICT there isn't a docker registry cache that ceph needs to be added to and so I'm closing this bug.