On 10/03/2010 05:06 PM, Ward, David - 0663 - MITLL wrote:
The 'cgconfig' tool from libcgroup (http://libcg.sourceforge.net) can be used
to mount one or more instances of the cgroup virtual filesystem, instead of
using the 'mount' command. However, cgconfig does not update /etc/mtab,
although the mounted cgroup filesystems do appear in /proc/mounts. (I am
using Fedora 13.)
Since lxc commands such as 'lxc-execute' just search /etc/mtab to see if any
cgroup filesystem is mounted, this causes them to fail with cgroup is not
mounted, even though this is not the case.
It seems to me that either:
1) cgconfig should update /etc/mtab, or
2) lxc should search /proc/mounts instead of /etc/mtab
(change one line in src/lxc/cgroup.c)
Which is the correct solution?
The /etc/mtab belongs to the 'mount' command. I don't know libcg well
but I don't think it should mount the cgroup. That should be up to the
package's post-install script to add the mount point in the fstab and
let the system do its job when it starts. That does not prevent the
cgconfig to update the fstab instead of mounting things in the back of
the administrator.
As the location of the fstab can be different depending of the distro,
that would makes sense to have the distro package script to update the
fstab ...
Solution (2) is correct because /etc/mtab is less reliable than
/proc/mounts.
Thanks
-- Daniel
--
Virtualization is moving to the mainstream and overtaking non-virtualized
environment for deploying applications. Does it make network security
easier or more difficult to achieve? Read this whitepaper to separate the
two and get a better understanding.
http://p.sf.net/sfu/hp-phase2-d2d
___
Lxc-devel mailing list
Lxc-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/lxc-devel
