lxc broken by cgroup-bin

[Tom Moyer]

Binary package hint: lxc

After installing cgroup-bin, the cgroups filesystem is mounted, by default, under /sys/fs/cgroups, but individual subsystems, such as devices are placed in subdirectories. The lxc-start command looks for the file devices.deny in the root (/sys/fs/cgroups), but fails to find it with the default configuration of cgroups-bin, which places the file devices.deny in /sys/fs/cgroups/devices/devices.deny.

[Clint Byrum (clint-fewbar)]

Just hit this as well in Natty.

$ sudo lxc-start -n lucid-test2
lxc-start: open /sys/fs/cgroup/cpu/lucid-test2/devices.deny : No such file or directory
lxc-start: failed to setup the cgroups for 'lucid-test2'
lxc-start: failed to setup the container
lxc-start: invalid sequence number 1. expected 2
lxc-start: failed to spawn 'lucid-test2'

I changed /etc/cgconfig.conf to

mount {
 cpu = /sys/fs//cgroup/cpu;
 cpuacct = /sys/fs/cgroup/cpu;
 devices = /sys/fs/cgroup/cpu;
 memory = /sys/fs/cgroup/cpu;
}

And all works as expected now.

[Robert Collins (lifeless)]

With spamaps config I can start containers but not stop them using lxc-stop. poweroff in the container works.

[Launchpad Janitor (janitor)]

This bug was fixed in the package lxc - 0.7.4.2-0.3ubuntu1

---------------
lxc (0.7.4.2-0.3ubuntu1) oneiric; urgency=low

  * Sync upstream 0.7.4.2
  * Add diff up to git head.
    - Fix interaction with cgroups-bin (LP: #784093)
    - Fix arch support to create i386 containers on amd64 (LP: #798476)
    - Support a bind-mounted $HOME with template (LP: #800482)
  * add debootstrap to Recommends (LP: #803745)
  * debian/patchs updates:
    - refresh 0002-disable-debian-checkroot-script.patch
    - drop:
      * 0004-add-ubuntu-mirrors.patch
      * 0005-add-netbase-to-templates.patch
      * 0006-fix-template-syntax-error.patch
      * 0007-natty-template-install-lxcguest.patch
      * 0010-templates-use-dpkg.patch
    - renamed and updated:
      * 0008-add-arm-to-supported-archs.patch to
        0004-add-arm-to-supported-archs.patch
      * 0009-templates-dont-use-devpts-in-fstab to
        0005-dont-use-devpts-in-fstab
      * 0011-templates-allow-fuse.patch to
        0006-templates-allow-fuse.patch
  * remove unused debian/lxc-start.sh
  * include autoreconf.mk to force Makefile.in to be rebuilt
  * Remaining changes over debian:
    - add lxcguest package
    - debian/control
      * keep docbook-utils in Build-Depends
    - lxc.default: add commented example MIRROR
 -- Serge Hallyn <email address hidden> Thu, 07 Jul 2011 13:53:52 -0500