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

[Cam Cope]

Edit: re: the systemd hierarchy, it's actually not mentioned in
/proc/cgroups, it's /proc/self/cgroups

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Title:
  fails to mount cgroupfs inside containers running on 16.04

Status in cgroup-lite package in Ubuntu:
  Triaged

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.

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