Open Stack

I wanted to give a quick heads up on some breaking changes that started
landing last week with regards to how container images are specified
with Heat parameters in TripleO. There are a few patches associated
with converting over to the new changes but the primary patches are
listed below here [1] and here [2].

Here are a few examples where I'm using a local (insecure) docker
registry on 172.19.0.2.

The old parameters were:

  ....
  DockerNamespaceIsRegistry: true
  DockerNamespace: 172.19.0.2:8787/tripleoupstream
  DockerKeystoneImage: centos-binary-keystone:latest
  ...

The new parameters simplify things quite a bit so that each
Docker*Image parameter contains the *entire* URL required to pull the
docker image. It ends up looking something like this:

  ...
  DockerInsecureRegistryAddress: 172.19.0.2:8787/tripleoupstream
  DockerKeystoneImage: 172.19.0.2:8787/tripleoupstream/centos-binary-
keystone:latest
  ...

The benefit of the new format is that it makes it possible to pull
images from multiple registries without first staging them to a local
docker registry. Also, we've removed the 'tripleoupstream' default
container names and now require them to be specified. Removing the
default should make it much more explicit that the end user has
specified container image names correctly and doesn't accidentally use
'tripleoupstream' by accident because one of the container image
parameters didn't get specified. Finally the simplification of the
DockerInsecureRegistryAddress parameter into a single setting makes
things more clear to the end user as well.

A new python-tripleoclient command makes it possible to generate a
custom heat environment with defaults for your environment and
registry. For the examples above I can run 'overcloud container image
prepare' to generate a custom heat environment like this:

openstack overcloud container image prepare --
namespace=172.19.0.2:8787/tripleoupstream --env-
file=$HOME/containers.yaml

We choose not to implement backwards compatibility with the old image
formats as almost all of the Heat parameters here are net new in Pike
and as such have not yet been released yet. The changes here should
make it much easier to manage containers and work with other community
docker registries like RDO, etc.

[1] http://git.openstack.org/cgit/openstack/tripleo-heat-templates/comm
it/?id=e76d84f784d27a7a2d9e5f3a8b019f8254cb4d6c
[2] https://review.openstack.org/#/c/479398/17