[CRIU] question on live migration for docker container using CRIU

[mona kashkoush]

thank you very much , this patch is very helpful

On Fri, Jan 2, 2015 at 9:28 PM, Saied Kazemi <saied at google.com> wrote:

> Mona,
>
> Pertaining to my previous reply, I just sent a patch for docker_cr.sh
> helper script to dynamically determine the right dockerinit file.  It
> may be easier for you to apply this patch and use it going forward.
>
> --Saied
>
>
>
> On Fri, Jan 2, 2015 at 9:43 AM, Saied Kazemi <saied at google.com> wrote:
> > Hi Mona,
> >
> > As Pavel pointed out, the error is due to not being able to bind mount
> > an external file.  But this is not because a the --ext-mount-map
> > command line option is missing.  It's because docker_cr.sh does not
> > know the dockerinit file name in /var/lib/docker/init (by default, it
> > assume Docker 1.0.0).
> >
> > Since you are running Docker 1.4, you need to change the following
> > BIND_MOUNT line in docker_cr.sh to reflect what you have in
> > /var/lib/docker/init:
> >
> > # since older versions of docker bind mount /.dockerinit but
> > # the path cannot be queried by docker inspect, we have to
> > # hard code it here
> > BIND_MOUNT[/.dockerinit]="${DOCKER_HOME}/init/dockerinit-1.0.0"
> >
> > Hope this helps.
> >
> > --Saied
> >
> >
> > On Wed, Dec 31, 2014 at 2:28 AM, Pavel Emelyanov <xemul at parallels.com>
> wrote:
> >> On 12/31/2014 04:36 AM, mona kashkoush wrote:
> >>>
> >>> i tried to  do a live migration for docker container using CRIU 1.4
> but dumping failed and this error appeared
> >>>
> >>> $  criu dump --tree <pid> --images-dir <path-to-existing-directory>
> --leave-stopped
> >>>
> >>> Error (mount.c:624): 125:./etc/hosts doesn't have a proper root mount
> >>> Error (files-reg.c:764): Unaccessible path opened 52:21244, need 5:1029
> >>> Error (cr-dump.c:1601): Dump files (pid: 3906) failed with -1
> >>> Error (cr-dump.c:1964): Dumping FAILED.
> >>>
> >>> and when i used the automated script "docker_cr.sh " for docker
> container migration , this succeeded for
> >>> dumping  but failed for restoring and this error appeared
> >>>
> >>> $ /src/criu-1.4/contrib/docker_cr.sh -r -v <container_id>
> >>>
> >>> restore failed
> >>> (00.072030)      1: Error (mount.c:1543): Can't mount at
> ./.dockerinit: No such file or directory
> >>
> >> Hm... This looks like some missed --ext-mount-map thing. Can you find
> out the
> >> exact command line docker_cr.sh calls CRIU with?
> >>
> >> Hopefully Saied (in Cc) can also advise something.
> >>
> >>> (00.072076) Error (cr-restore.c:1838): Restoring FAILED.
> >>>
> >>> * this is information about docker which i used
> >>>
> >>> Storage Driver: aufs
> >>>  Root Dir: /var/lib/docker/aufs
> >>>  Dirs: 67
> >>> Execution Driver: native-0.2
> >>> Kernel Version: 3.13.0-43-generic
> >>>
> >>> thanks for your time
> >>>
> >>> --
> >>> Mona Salah
> >>> Research Assistant
> >>> IRI institute
> >>> The City of Scientific Research and Technology Applications,Alex ,
> Egypt
> >>>
> >>>
> >>> _______________________________________________
> >>> CRIU mailing list
> >>> CRIU at openvz.org
> >>> https://lists.openvz.org/mailman/listinfo/criu
> >>>
> >>
>



-- 
Mona Salah
Research Assistant
IRI institute
The City of Scientific Research and Technology Applications,Alex , Egypt
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