One thing that I am looking forward to is Docker support for Windows. Would really like to see that feature.
I don't think there will be direct Docker support for Windows (erm... hrm)
There's no reason you can't run CoreOS in qemu or CoreOS in VirtualBox, but all of those things are still coming back to Linux Containers. Did you have an idea of another way?
(coLinux is a port of the Linux kernel to run as an ordinary Windows program, so you can run the Linux kernel as a Windows userland program by double-clicking on "linux.exe"; then you can SSH in and mess around, etc)
Windows containers running in a Windows host is much more likely. Commercial solutions like Virtuozzo Containers offer Windows on Windows support today [1]. Someone could implement a Virtuozzo-for-Windows provider for Docker, but that seems like a long shot.
[1]: http://www.parallels.com/products/pvc/what-s-new-for-windows...
There is nothing special with nesting cgroups and namespaces from the kernel point of view. The interesting part is to work around the little details (as anybody who ran nested LXC containers will know) :-)
You could run most essential system components (syslog, ssh, cron...) inside containers, and bind-mount /home when it makes sense. Since those components need elevated privileges, I don't know if containers would be that useful... And then systemd already puts services in cgroups; it's a nice approach (IMHO).
Or you could use containers a bit like virtualenvs. If you're a Python developer familiar with virtualenvwrapper, you probably use mkvirtualenv when you start working on a new project (or on a different setup for an existing project). Containers could be used in a similar manner with some clever wrappers.
There is some significant work in progress to add compatibility for non-AUFS systems. I don't have an accurate timeline at this point, but expect something (or at least an announcement) at the end of the month!
Edit: yes, docker on arch still requires a custom kernel. See http://docs.docker.io/en/latest/installation/archlinux/
Unless you want to waste a lot of time installing the nested OS's, like I did, I suggest using pre-installed images you can throw right in.
Now that the obligatory comments have been covered, we can move on. Yay!
https://github.com/dotcloud/docker/blob/master/server.go#L12...
...and create your own images.
It's unsupported, but it'll work.
