[CRIU] Docker HOWTO
Pavel Emelyanov
xemul at parallels.com
Fri Sep 12 11:48:32 PDT 2014
On 09/12/2014 08:47 PM, Saied Kazemi wrote:
> I just requested an account so that I'd have edit permission.
> As soon as it's set up, I'll add it to the Docker HOWTO page.
Account confirmed :) Thanks
> --Saied
>
>
>
> On Fri, Sep 12, 2014 at 12:59 AM, Pavel Emelyanov <xemul at parallels.com <mailto:xemul at parallels.com>> wrote:
>
> On 09/11/2014 10:11 PM, Saied Kazemi wrote:
> > Great! Here is some additional text for the HOWTO page that introduces
> > docker_cr.sh and explains its usage.
>
> It's very useful, thanks :) Can you integrate this text into
> the http://criu.org/Docker page?
>
> > --Saied
> >
> >
> > Helper Script
> >
> > As seen in the above examples, the CRIU command line for checkpointing and
> > restoring a Docker container is pretty long. For restore, there is also
> > an additional step to set up the root filesystem before invoking CRIU.
> >
> > To automate the C/R process, there is a helper script in the contrib
> > subdirectory of CRIU sources, called docker_cr.sh. In addition to
> > invoking CRIU, this helper script sets up the root filesystem for AUFS,
> > UnionFS, and VFS for restore.
> >
> > With docker_cr.sh, all you have to provide is the container ID.
> > If you don't specify a container ID, docker_cr.sh will list all running
> > containers and prompt you to choose one. Also, as shown in the help
> > output below, by setting the appropriate environment variable, it's
> > possible to tell docker_cr.sh which Docker and CRIU binaries to use,
> > where Docker's home directory is, and where CRIU should save and look
> > for its image files.
> >
> > # docker_cr.sh --help
> > Usage:
> > docker_cr.sh -c|-r [-hv] [<container_id>]
> > -c, --checkpointcheckpoint container
> > -h, --helpprint help message
> > -r, --restorerestore container
> > -v, --verboseenable verbose mode
> >
> > Environment:
> > DOCKER_HOME(default /var/lib/docker)
> > CRIU_IMG_DIR(default /var/lib/docker/criu_img)
> > DOCKER_BINARY(default docker)
> > CRIU_BINARY(default criu)
> >
> > Below is an example to checkpoint and restore Docker container 4397:
> >
> > # docker_cr.sh -c 4397
> > dump successful
> > # docker_cr.sh -r 4397
> > restore successful
> >
> > Optionally, you can specify -v to see the commands that docker_cr.sh
> > executes. For example:
> >
> > # docker_cr.sh -c -v 40d3
> > docker binary: docker
> > criu binary: criu
> > image directory: /var/lib/docker/criu_img/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf
> > container root directory: /var/lib/docker/aufs/mnt/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf
> >
> > criu dump -v4 -D /var/lib/docker/criu_img/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf -o dump.log --manage-cgroups --evasive-devices --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 -t 5991 --root /var/lib/docker/aufs/mnt/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf
> >
> > dump successful
> > (00.020827) Dumping finished successfully
> >
> > # docker_cr.sh -r -v 40d3
> > docker binary: docker
> > criu binary: criu
> > image directory: /var/lib/docker/criu_img/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf
> > container root directory: /var/lib/docker/aufs/mnt/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf
> >
> > mount -t aufs -o
> > /var/lib/docker/aufs/diff/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf
> > /var/lib/docker/aufs/diff/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf-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/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf
> >
> > criu restore -v4 -D /var/lib/docker/criu_img/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf -o restore.log --manage-cgroups --evasive-devices --ext-mount-map /etc/resolv.conf:/var/lib/docker/containers/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf/resolv.conf --ext-mount-map /etc/hosts:/var/lib/docker/containers/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf/hosts --ext-mount-map /etc/hostname:/var/lib/docker/containers/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf/hostname --ext-mount-map /.dockerinit:/var/lib/docker/init/dockerinit-1.0.0 -d --root /var/lib/docker/aufs/mnt/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf --pidfile /var/lib/docker/criu_img/40d363f564e00a2f893579fa012a200e475dcf8df47f2a22b7dd0860ffc3d7bf/restore.pid
> >
> > restore successful
> > (00.408807) Restore finished successfully. Resuming tasks.
> >
> > root 6206 1 1 10:49 ? 00:00:00 /bin/sh -c i=0; while true; do echo $i >> /foo; i=$(expr $i + 1); sleep 3; done
> >
> >
> >
> > On Tue, Sep 9, 2014 at 5:10 AM, Pavel Emelyanov <xemul at parallels.com <mailto:xemul at parallels.com> <mailto:xemul at parallels.com <mailto:xemul at parallels.com>>> wrote:
> >
> > On 09/03/2014 11:28 PM, Filipe Brandenburger wrote:
> > > Acked-by: Filipe Brandenburger <filbranden at google.com <mailto:filbranden at google.com> <mailto:filbranden at google.com <mailto:filbranden at google.com>>>
> > >
> > > On Wed, Sep 3, 2014 at 12:27 PM, Saied Kazemi <saied at google.com <mailto:saied at google.com> <mailto:saied at google.com <mailto:saied at google.com>>> wrote:
> > >> As promised, here is a shell script to simplify checkpointing and restoring
> > >> a Docker container. The usage is pretty simple and obvious. Try
> > >> docker_cr.sh --help to get started. I suggest adding this file to the
> > >> scripts subdirectory of CRIU and installing it where criu is installed, but
> > >> I have not modified the Makefile.
> > >>
> > >> I'd like to acknowledge Filipe's time for his review and feedback.
> > >>
> > >> Cheers!
> >
> > Sorry for the delay. The patch is applied with the scripts/ -> contrib/
> > directory change. Huge thanks!
> >
> >
> >
> >
> > _______________________________________________
> > CRIU mailing list
> > CRIU at openvz.org <mailto:CRIU at openvz.org>
> > https://lists.openvz.org/mailman/listinfo/criu
> >
>
>
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