On 06/04/2012 03:33 PM, Glauber Costa wrote: > Currently, it is possible for a process to join existing > net, uts and ipc namespaces. This patch allows a process to join an > existing pid namespace as well. > > For that to remain sane, some restrictions are made in the calling process: > > * It needs to be in the parent namespace of the namespace it wants to jump to > * It needs to sit in its own session and group as a leader. > > The rationale for that, is that people want to trigger actions in a Container > from the outside. For instance, mainstream linux recently gained the ability > to safely reboot a container. It would be desirable, however, that this > action is triggered from an admin in the outside world, very much like a > power switch in a physical box. > > This would also allow us to connect a console to the container, provide a > repair mode for setups without networking (or with a broken one), etc. Hi Glauber, I am in favor of this patch but I think the pidns support won't be complete and some corner-cases are not handled. May be you can look at Eric's patchset [1] where, IMO, everything is taken into account. Some of the patches may be already upstream. Thanks -- Daniel [1] http://git.kernel.org/?p=linux/kernel/git/ebiederm/linux-namespace-control-devel.git;a=summary -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
