Docker is like github, but for entire operating systems. It's a really cool feat of engineering, but there aren't a lot of resources out there for it as you would expect. I'll take a look at your client API and see if there could be changes.
Sort of... it's power is as version controlled packaging / deployment. The config files let you say "install all of these dependencies, run services for a reverse proxy / search engine / database, hook them together like so, run X copies across a farm of machines, and expose these ports / directories within their file systems." What sets it apart from other similar programs (Puppet, Chef, Ansible, Vagrant) is that instead of running those programs in virtual machines or the hose machine, they are run within containers. This means less overhead than a VM, but also somewhat different security concerns