cgroup-bin package installs with errors (failure to parse /etc/cgconfig.conf)

[James Hunt]

Binary package hint: cgroup-bin

[james@azul]:~> sudo apt-get install cgroup-bin
[sudo] password for james:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
  libcgroup1
The following NEW packages will be installed
  cgroup-bin libcgroup1
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 83.5kB of archives.
After this operation, 438kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://gb.archive.ubuntu.com/ubuntu/ maverick/universe libcgroup1 i386 0.36.2-3 [32.0kB]
Get:2 http://gb.archive.ubuntu.com/ubuntu/ maverick/universe cgroup-bin i386 0.36.2-3 [51.5kB]
Fetched 83.5kB in 0s (128kB/s)
Selecting previously deselected package libcgroup1.
(Reading database ... 279201 files and directories currently installed.)
Unpacking libcgroup1 (from .../libcgroup1_0.36.2-3_i386.deb) ...
Selecting previously deselected package cgroup-bin.
Unpacking cgroup-bin (from .../cgroup-bin_0.36.2-3_i386.deb) ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
ureadahead will be reprofiled on next reboot
Setting up libcgroup1 (0.36.2-3) ...
Setting up cgroup-bin (0.36.2-3) ...
Starting cgconfig service: Loading configuration file /etc/cgconfig.conf failed
Cgroup mounting failed
 * Failed to parse /etc/cgconfig.conf
invoke-rc.d: initscript cgconfig, action "start" failed.
dpkg: error processing cgroup-bin (--configure):
 subprocess installed post-installation script returned error exit status 3
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Errors were encountered while processing:
 cgroup-bin
E: Sub-process /usr/bin/dpkg returned an error code (1)

___________________

The contentious file in question ("/etc/cgconfig.conf" -- attached) does exist and was created as part of the install of the cgroup-bin package.

The guts of this file are:

mount {
  cpu = /mnt/cgroups/cpu;
  cpuacct = /mnt/cgroups/cpuacct;
  devices = /mnt/cgroups/devices;
}

Note that /mnt/cgroups/ *has* been created on install of this package, but the cpu, cpuacct and devices subdirectories have not.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: cgroup-bin 0.36.2-3
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic-pae 2.6.35.4
Uname: Linux 2.6.35-22-generic-pae i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Fri Nov 26 10:08:04 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: libcgroup

[Serge Hallyn (serge-hallyn)]

Thanks for taking the time to report this bug.

The hierarchy should be created by cgconfigparser, IIUC. However, it is not succeeding. I believe the stock cgconfig is bad.

I'm debugging that right now as part of converting libcgroup to upstart. I hope to have a fix in soon.

[Serge Hallyn (serge-hallyn)]

In the meantime, given the stock configuration file, what you need is to have a tmpfs mounted under /sys/fs/cgroup. You can add a line to /etc/fstab like:

none /sys/fs/cgroup tmpfs nosuid,nodev 0 0

[Serge Hallyn (serge-hallyn)]

Could you try the packages posted in https://bugs.launchpad.net/ubuntu/+source/libcgroup/+bug/644669/comments/2 and let me know if they do what you need?

[Serge Hallyn (serge-hallyn)]

This bug is fixed in natty.

libcgroup (0.37.1-1ubuntu1) natty; urgency=low

  * Mount a tmpfs at /sys/fs/cgroup so cgred can create subdirs. Otherwise
    the whole thing fails.
  * Convert to upstart (LP: #644669)
  * add a job to make libvirt (if it is installed and starts) wait until
    cgred is running.

 -- Serge Hallyn <email address hidden> Thu, 17 Feb 2011 18:03:17 -0600