[lxc-devel] Support request - LXC on RHEL 6 derived distributions

[Essex, Jonathan]

I'm an application architect for a moderately large software company.

 

I'm interested in using linux containers on 'enterprise' flavour
distros; as far as I can see the necessary options are in place on RHEL
6.

 

However the focus here seems to be on the mainline kernel. 

 

What I'd like to achieve is a Scientific Linux 6 container template to
run on SL6. Experience hasn't been good so far; given the general lack
of documentation elsewhere I know I'm going to need some support if I'm
going to make it work.

 

With one question unanswered and another post lost in moderation, my
assumption is that there's either no appetite for this or I'm asking
stupid questions.

 

One way or the other, I'd very much appreciate it if someone could steer
me in the right direction.

 

Thanks

Jonathan

 



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Re: [lxc-devel] cgroups: support cgroups mounted in multiple places (v3)

[Michael H. Warfield]

On Sun, 2011-07-03 at 19:24 +0100, jonathan essex wrote:
> I seem to be having this same issue in a Scientific Linux 6.0 (RHEL 6
> clone) installation with lxc-0.7.4.1
> 
> lxc-checkconfig seems to think everything is OK, but when I try to
> lxc-start a container I've created, I get this error message:
> 
> lxc-start: no ns_cgroup option specified
> lxc-start: failed to spawn 'centos-test'
> lxc-start: No such file or directory - failed to remove cgroup
> '/cgroup/cpuset/centos-test'

This sounds like my "failed" case in testing with libcgroup enabled.

The fact that it's mounted on /cgroup and not /sys/fs/cgroup does not
bode well all all.


1) uname -a

2) chkconfig cgconfig

You probably need to add a line to your /etc/fstab long the lines of
this:

cgroup  /sys/fs/cgroupcgroup  defaults0 0

Then run the commands:

chkconfig cgconfig off
chkconfig cgred off

The reboot (I have NOT had luck manually unmounting those cgroups and
remounting as a single mount point).

If I understand Serge's comments correctly, we can not get the
multipoint mounts to work even with the patched and updated lxc package
due to the lack of "clone_children" in that kernel, so you need to
switch a single mount-point mount to get lxc to work.  Then you don't
even need the multipoint patches to get it to work though you may have
tweaks to make.

> Is this the problem under discussion? I'm new to lxc, so quite
> possible I'm just misunderstanding something.

> Happy to test the patch if someone will outline how to get it/apply
> it. (Aware that this is probably a tedious newbie type question, but
> asking anyway)

Serge or Daniel may correct me but I'm under the impression that it will
not work on that kernel, depending on the rev you report back, for RHEL
6 / SL6.

> Cheers
> Jon

Regards,
Mike
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