[RFC] AUFS disabled for 12.04

Tim Gardner rtg.canonical at gmail.com
Fri Mar 2 13:58:45 UTC 2012

On 03/01/2012 03:08 PM, Gary Poster wrote:
> Hi.
> aufs was reliable for us on Oneiric when creating ephemeral lxc
> instances based on an underlying template. The most recent overlayfs
> issue that we discovered is today's
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/944386
> The summary is that, within an overlayfs, this fails:
> gary at garubtosh:~/tmp$ touch 3
> gary at garubtosh:~/tmp$ chmod 0444 3
> gary at garubtosh:~/tmp$ ln 3 4
> ln: failed to create hard link `4' => `3': Operation not permitted
> That error makes xvfb unable to start, in this particular case.
> I'd feel a *lot* more comfortable if aufs were still around, in case we
> end up not finding the next overlayfs bug until it is too late for our
> project's delivery.
> Thank you,
> Gary

In light of the concerns about overlayfs being sufficiently cooked in 
time for Precise, Andy Whitcroft and I have decided to re-enable aufs. 
We will continue to advocate for dropping aufs in favor of a sufficient 
upstream solution at each development cycle. This means that aufs _will_ 
disappear in future backported LTS kernels.

In other words, don't bet your business on aufs.

I am speaking directly to the lxc and server folks. aufs has _one_ 
maintainer, is enormously complex, is difficult to integrate with each 
new kernel version, and will _never_ be accepted upstream.

Tim Gardner tim.gardner at canonical.com

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