[Bug 1668724] Re: fails to mount cgroupfs inside containers running on 16.04

[Robie Basak]

Hello Cam, or anyone else affected,

Accepted cgroup-lite into precise-proposed. The package will build now
and be available at https://launchpad.net/ubuntu/+source/cgroup-
lite/1.1.6 in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: cgroup-lite (Ubuntu Precise)
       Status: New => Fix Committed

** Tags added: verification-needed

** Changed in: cgroup-lite (Ubuntu Xenial)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1668724

Title:
  fails to mount cgroupfs inside containers running on 16.04

Status in cgroup-lite package in Ubuntu:
  Fix Released
Status in cgroup-lite source package in Precise:
  Fix Committed
Status in cgroup-lite source package in Trusty:
  New
Status in cgroup-lite source package in Xenial:
  Fix Committed
Status in cgroup-lite source package in Yakkety:
  New

Bug description:
  I need to run nested Ubuntu 12.04 and 14.04 containers on 16.04 hosts,
  and have noticed that the cgroups-mount script for mounting the
  cgroups inside the containers has stopped working. This is because
  systemd now comounts multiple controllers on a single hierarchy, which
  prevents mounting them individually inside the container.

  ===========  SRU Justification ================
  Impact: nested containers fail to start
  Reproduce:  create a root owned container;  install lxc and cgroup-lite;  create a container, and try to start it.  Starting will fail if cgroup-lite is running in the first level container without this patch.
  Regression potential:  should be low, it's possible that the regexp is simply wrong for some cases.
  ===============================================

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