Comment 1 for bug 1736803

As part of the new containers based undercloud I've just proposed added an option called 'docker_insecure_registries'. This would be appended to the list of default Undercloud insecure settings for the local registry and would allow you to pull containers from any set of registries you'd like and would survive an upgrade.

https://review.openstack.org/#/c/526147/3/tripleoclient/v1/undercloud_config.py

Again, this is not yet backported to instack-undercloud although we could look at doing something there as well.