[CRIU] Docker User Namespaces + CRIU

[Ross Boucher]

Andrei,

Sorry it took so long for me to try this out. Didn't quite work, here's the
dump log (it's a new error):
https://gist.github.com/boucher/4cb16a71a64f11c7877dcd6696d2a062

-Ross



On Mon, Oct 17, 2016 at 7:29 PM Andrei Vagin <avagin at virtuozzo.com> wrote:

> On Tue, Oct 04, 2016 at 08:40:42AM -0700, Andrei Vagin wrote:
> > On Tue, Oct 4, 2016 at 2:58 AM, Pavel Emelyanov <xemul at virtuozzo.com>
> wrote:
> > > On 09/30/2016 05:42 PM, Ross Boucher wrote:
> > >> hmm. That path should be just pointing to /dev/null.
> > >
> > > Then the "--ext-mount-map auto" ? :)
> >
> > I think it is a bad idea to use "--ext-mount-map auto"  here. It may
> > solve this problem, but add other side effects.
> >
> > I remember runc has a code to handle ext mounts, so we need to add
> > logic about these mounts too.
>
> Hi Ross,
>
> I think I've fixed CRIU and runc to dump/restore containers with userns.
> Clould you try out how it works for you?
>
> https://github.com/opencontainers/runc/pull/1110
> https://github.com/avagin/criu/tree/docker
>
> Thanks,
> Andrei
> >
> > >
> > >> On Fri, Sep 30, 2016 at 5:59 AM Pavel Emelyanov <xemul at virtuozzo.com
> <mailto:xemul at virtuozzo.com>> wrote:
> > >>
> > >>     On 09/28/2016 05:18 PM, Ross Boucher wrote:
> > >>     > Hey all,
> > >>     >
> > >>     > I wanted to start playing around with user namespace support in
> Docker as part of seeing where checkpoint/restore currently works and
> doesn't work. Turns out things don't work currently, here's a checkpoint
> log:
> > >>     >
> > >>     >
> https://gist.github.com/boucher/768a74b236470e3d28a49990fe2f1665
> > >>
> > >>     Error (mount.c:716): mnt: 66:./proc/sched_debug
> > >>
> > >>     It's again the lack of --ext-mount-map option.
> > >>
> > >>     > Any thoughts on what might be going wrong?
> > >>     >
> > >>     > -Ross
> > >>     >
> > >>     >
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> > >>     >
> > >>
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