More than this, Ubuntu are trying to remove it from their distribution in favour of overlayfs [0]. As mentioned there, the reason is that aufs is not and will not be part of the mainline kernel. Precise 12.04 was going to be without AUFS, but some issues cropped up, keeping it around.
It now looks like overlayfs will make it into the 3.10 mainline kernel [1], so it may be a better choice in the future. I think that the Under the hood stuff on docker's page are implementation details that can change, so a switch to overlayfs when that becomes more suitable could be possible. (Confirmation from the dotClouders present would be apprecaited.)
It now looks like overlayfs will make it into the 3.10 mainline kernel [1], so it may be a better choice in the future. I think that the Under the hood stuff on docker's page are implementation details that can change, so a switch to overlayfs when that becomes more suitable could be possible. (Confirmation from the dotClouders present would be apprecaited.)
[0] https://lists.ubuntu.com/archives/ubuntu-devel/2012-February...
[1] http://lwn.net/Articles/542707/