Fedora Server and Docker

[Stephen Gallagher]

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I've been playing with Docker quite a bit lately, particularly the
Fedora Dockerfiles[1] to see what might be useful for the Fedora Server.

For one thing, it occurs to me that we may want to have a strategy for
using Docker images in the Fedora Server for any Roles that can
support it[2].

Advantages:
 * Deployment can be scripted as dockerfiles instead of full packages
 * The same Docker image is guaranteed(?) to be loadable by the next
   version of Fedora, making distro-upgrades safer.
 * Role upgrades can be handled by starting up a new Docker image with
   the updated software and then migrating data between them.
 * With Docker and SElinux, our Roles can be isolated from the host
   server. (And potentially migrated to a Fedora Cloud system later).

I've specifically been playing around with using Docker images of
PostgreSQL (our planned Database Server Role for Fedora 21) and have
found that the Fedora Dockerfile is extremely easy to build and get
running.

I think that it would be to our advantage to tend towards using Docker
images as the implementation for the Database Server Role as well as
the proposed memcached role and potentially others, such as the
fileserver or iSCSI target roles.

This *would* imply adding the docker-io package as part of the
standard installation of the Fedora Server.

Thoughts?


[1] https://github.com/fedora-cloud/Fedora-Dockerfiles\
[2] FreeIPA, our choice of Domain Controller, is not currently
supported under Docker, though upstream has a working
proof-of-concept. This we can revisit down the road.
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