That would be https://quay.io/ , but also the internet. Since rkt (or appc discovery rather) just relies on DNS/URL hierarchy to refer to images. Any web server can be a "registry".
I'm one of the people working in the OCI community. Discovery/distribution is something that I care alot about personally and the whole "any web server can be a registry" idea is definitely where I want OCI to go with this. As someone who helps develop a distribution (openSUSE / SUSE Linux Enterprise) my opinion is that the current state of distribution really needs to be improved.
I also recently talked to some CoreOS devs at Dockercon and have started considering extending rkt to better support OCI runtimes (and images though images are "supported" at the moment). Exciting times.
I also recently talked to some CoreOS devs at Dockercon and have started considering extending rkt to better support OCI runtimes (and images though images are "supported" at the moment). Exciting times.