On Wed, Feb 11, 2015 at 05:00:23PM +0100, Serge E. Hallyn wrote: > We absolutely would love to use cgroup namespaces to run older > userspace in containers. I don't know that it's actually possible > to do both that and use unified hierarchy at the same time though, > which is unfortunate. So an Ubuntu 12.04 container will never, afaics, > be able to run inside an ubuntu 16.04 host that is using unified > hierarchy, without using backported newer versions of lxc (etc) in > the container. So, the constraint there are the controllers. A controller can't be attached to two hierarchies at the same time for obvious reasons, so regardless of NS, you can't use the same controller on a unified hierarchy *and* a traditional hierarchy. NS doesn't adds or substracts from the situation. If you decide to attach a controller to a traditional hierarchy, that's where it's gonna be available. If you attach it to the unified hierarchy, the same story. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
