[CRIU] Docker HOWTO

[Saied Kazemi]

Sure, that would work.  Will it then be the responsibility of the user to
install it?

--Saied


On Fri, Sep 5, 2014 at 8:43 AM, Pavel Emelyanov <xemul at parallels.com> wrote:

> On 09/05/2014 07:00 PM, Saied Kazemi wrote:
> > Hi Pavel,
> >
> > Thank you :)  You're right, this script will eventually go away but for
> now it makes life much much
> > easier, reducing the command line arguments to at most one: the
> container ID.
>
> Hm, OK. If you don't mind, I will relocate it to the contrib/ dir as
> Filipe suggested.
>
> > So one would simply do:
> >
> > $ sudo docker_cr.sh -c
> > $ sudo docker_cr.sh -r
> >
> > If the container ID is not specified on the command line, the script
> shows all containers and prompts the user to select the right one.  When
> entering the ID, only enough characters to uniquely identify the container
> is needed.  The -v flag can be optionally specified to enable verbose mode.
> >
> > Without this script, one would have to invoke criu as follows to
> checkpoint:
> >
> > $ sudo criu dump -o dump.log -v4 -t 17810 \
> > -D /tmp/img/<container_id> \
> > --root /var/lib/docker/aufs/mnt/<container_id> \
> > --ext-mount-map /etc/resolv.conf:/etc/resolv.conf \
> > --ext-mount-map /etc/hosts:/etc/hosts \
> > --ext-mount-map /etc/hostname:/etc/hostname \
> > --ext-mount-map /.dockerinit:/.dockerinit \
> > --manage-cgroups \
> > --evasive-devices
> >
> > And to restore, one would have to set up the filesystem first and then
> invoke criu as follows:
> >
> > $ sudo mount -t aufs -o br=\
> > /var/lib/docker/aufs/diff/<container_id>:\
> > /var/lib/docker/aufs/diff/<container_id>-init:\
> >
> /var/lib/docker/aufs/diff/a9eb172552348a9a49180694790b33a1097f546456d041b6e82e4d7716ddb721:\
> >
> /var/lib/docker/aufs/diff/120e218dd395ec314e7b6249f39d2853911b3d6def6ea164ae05722649f34b16:\
> >
> /var/lib/docker/aufs/diff/42eed7f1bf2ac3f1610c5e616d2ab1ee9c7290234240388d6297bc0f32c34229:\
> >
> /var/lib/docker/aufs/diff/511136ea3c5a64f264b78b5433614aec563103b4d4702f3ba7d4d2698e22c158:\
> > none /var/lib/docker/aufs/mnt/<container_id>
> >
> > $ sudo criu restore -o restore.log -v4 -d
> > -D /tmp/img/<container_id> \
> > --root /var/lib/docker/aufs/mnt/<container_id> \
> > --ext-mount-map
> /etc/resolv.conf:/var/lib/docker/containers/<container_id>/resolv.conf \
> > --ext-mount-map
> /etc/hosts:/var/lib/docker/containers/<container_id>/hosts \
> > --ext-mount-map
> /etc/hostname:/var/lib/docker/containers/<container_id>/hostname \
> > --ext-mount-map /.dockerinit:/var/lib/docker/init/dockerinit-1.0.0 \
> > --manage-cgroups \
> > --evasive-devices
> >
> > So I suggest that this script be installed along with criu.
> >
> > If you agree, I can prepare additional material for the Docker HOWTO
> page to cover docker_cr.sh as well as AUFS and UnionFS support.
> >
> > Cheers!
> >
> > --Saied
> >
> >
> >
> >
> > On Fri, Sep 5, 2014 at 7:40 AM, Filipe Brandenburger <
> filbranden at google.com <mailto:filbranden at google.com>> wrote:
> >
> >     Hi Pavel,
> >
> >     On Fri, Sep 5, 2014 at 7:34 AM, Pavel Emelyanov <xemul at parallels.com
> <mailto:xemul at parallels.com>> wrote:
> >     > Guys, it's really great work you did with Docker! Do you think
> that this
> >     > script is better to be planted into criu sources? I thought that,
> since
> >     > we restore container detached from dockerd, some work will be done
> on the
> >     > Docker side, that that _it_ does all these preparations.
> >
> >     Yes, the intention is to integrate criu support into libcontainer
> next
> >     (which should maybe solve the "detached after restore" issue) and
> then
> >     finally add hooks to docker (so that you can use "docker dump" and
> >     "docker restore"). At that point, we can probably obsolete this
> >     script.
> >
> >     But while we worked on that, we can share this script that we have
> >     been using to test it internally, so that we can make it easier for
> >     others to try it as well :-)
> >
> >     If you think scripts/ is not the best location for this script, maybe
> >     contrib/ would be good?
> >
> >     Cheers,
> >     Filipe
> >
> >
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openvz.org/pipermail/criu/attachments/20140905/0c79b9bd/attachment.html>