[CRIU] Adding checkpoint/restore support to podman question

[Adrian Reber]

If you could implement the CRIU part that would be great. I have not
started yet but I would then do the necessary changes in runc (and
higher).

		Adrian

On Thu, May 03, 2018 at 10:39:45AM -0700, Andrei Vagin wrote:
> Hi Adrian,
> 
> Sorry for the late response. I think we already discussed this scheme
> and decided that we need to add support for "external" net namespaces.
> 
> If you want, I can implement a criu part. Let me know if you will have
> any other questions.
> 
> Thanks,
> Andrei
> 
> On Fri, Apr 06, 2018 at 05:50:49PM +0200, Adrian Reber wrote:
> > Currently I am trying to add checkpoint/restore support to podman:
> > 
> > https://github.com/projectatomic/libpod/pull/469
> > 
> > The good thing is, the basic functionality works. Right now I am trying
> > to setup the network in podman to place the restored processes in a
> > container with the same IP and I am confused by the network namespace.
> > 
> > I see CRIU has '--empty-ns' and '--join-ns' but I am not sure what is
> > needed and correct.
> > 
> > My plan was to let podman set up a new network namespace with the same
> > IP. That works. After restore I can ping the IP of the restored
> > container, but the restored processes are now in a different namespace
> > according to proc. So now I have the network namespace podman created
> > with a working IP address and I have the network namespace which
> > probably CRIU created during restore.
> > 
> > So right now I am confused at which levels the network namespace has to
> > be handled. At podman or at runc, which is called by podman? Or at
> > CRIU's level? Or do I tell CRIU to ignore the network namespace during
> > checkpoint or restore?
> > 
> > If anybody has an idea what the right steps are to restore the network
> > setup correctly that would be great! Thanks.
> > 
> > 		Adrian

		Adrian

-- 
Adrian Reber <adrian at lisas.de>            http://lisas.de/~adrian/
Mr. Cole's Axiom:
	The sum of the intelligence on the planet is a constant; the
	population is growing.