I've been having trouble figuring out the value-add of using Docker over Ubuntu's built-in LXC functionality [1]. [1] https://help.ubuntu.com/12.04/serverguide/lxc.html
I read some more about Docker since posting the parent. The deal-killer for me is that Docker doesn't work on btrfs, and I've been running on btrfs for a while now. Apparently it's actually bugs in the aufs kernel code when using it with a btrfs filesystem. I found a closed issue [1], apparently Docker is currently focusing on refactoring the existing code to have a more extensible plugin-style architecture, and will…
You'll be happy to know that btrfs support will come come through devmapper by 0.7.