Hi again Answering my own e-mail on a few points: . first off, stupid me, http://libvirt.org/format.html indeed is empty and it seems to be by design, but the subtrees are not, like e.g. http://libvirt.org/formatdomain.html . from this page it seems like using something like <os> <type arch='i686'>exe</type> <init>/sbin/init</init> </os> in the guest XML config should do the trick I need to investigate this out a little further to see if it does what I am expecting or not — Thierry On 02 Jul 2014, at 00:16, Thierry Parmentelat <thierry.parmentelat(a)inria.fr&gt; wrote:

Hi again Sorry for the late reaction on this.. So everything seems to work fine for me when using the setting below, except maybe for one little point I was kind of expecting that # virsh -c lxc:/// lxc-enter-namespace my_32bits_vm ... would run in a 32bits environment too, but from what I can see it is not the case I take it it can be argued, reading the documentation for lxc-enter-namespace again, that might well be the intended behaviour In this case I would argue it would make a lot of sense to have either : (a) lxc-enter-namespace to do the right thing personality-wise as well (possibly through an option if there are legacy concerns) or (b) a virsh function/command that can help retrieve the right personality like e.g. virsh -c lxc:/// personality the_vm that would return either linux32 or linux64 so it would be possible to run $(virsh -c lxc:/// personality the_vm) virsh -c lxc:/// lxc-enter-namespace the_vm — /usr/bin/env yum groupinstall ... Or is there something else available already that I am missing altogether ? Thanks — Thierry On 02 Jul 2014, at 11:29, Daniel P. Berrange <berrange(a)redhat.com&gt; wrote: