[CRIU] How to pre-dump lxc or docker?

[Pavel Emelyanov]

On 09/24/2014 03:21 PM, 陈晓 wrote:
>     First I execute pre-dump, the command is : criu pre-dump -D images_lxc_pre/ -o /software/checkpoint/images_lxc_pre/dump.log -t 19092 -v4
>     Then I execute dump, the command is: criu dump --tcp-established --file-locks --link-remap --force-irmap --manage-cgroups --action-script /usr/local/libexec/lxc/lxc-restore-net -D images_lxc_dump/ --prev-images-dir ../images_lxc_pre/ -o /software/checkpoint/images_lxc_dump/dump.log -t 19092 -v4
> Finally when I restore the lxc, the command is: criu restore --tcp-established --file-locks --link-remap --force-irmap --manage-cgroups --action-script /usr/local/libexec/lxc/lxc-restore-net -D /software/checkpoint/images_lxc_dump/ -o /software/checkpoint/images_lxc_dump/restore.log --root /usr/local/lib/lxc/rootfs --restore-detached --restore-sibling --pidfile /tmp/file54YJjg --veth-pair eth0=veth1D8I78
> the restore error is : Error (mount.c:1947): New root and old root are the same.
> So what should I do?

I'd recommend you to use the lxc tools for that. They do all the necessary preparations.
http://criu.org/LXC

In your particular case you should prepare the root directory to be exactly the same as
lxc-start does -- mount something there in priave/slave mode. You cannot just take arbitrary
path and set it as root.


Thanks,
Pavel