[CRIU] Restore CRIU image across a host

[Pavel Emelyanov]

On 08/05/2015 12:01 AM, Hui Kang wrote:
> Hi,
> I am trying to restore the process on a different criu host by transferring the CRIU images. The checkpointed criu images are scp-ed to a different host; however the restore fails. The restore.log shows that
> 
> (00.075765)      1: nr_restored_pages: 66
> (00.075772)      1: nr_shared_pages:   0
> (00.075779)      1: nr_droped_pages:   0
> (00.075829)      1: Found fd 1 (id pipe:[13922]) in inherit fd list (caller close_old_fds)
> (00.075841)      1: Found fd 2 (id pipe:[13923]) in inherit fd list (caller close_old_fds)
> (00.075859)      1: cg: Move into 2
>  1: cg:   `-> blkio//[PID]/tasks
> (00.075906)      1: cg:   `-> cpu//[PID]/tasks
> (00.075946)      1: cg:   `-> cpuacct//[PID]/tasks
> (00.075967)      1: cg:   `-> cpuset//[PID]/tasks
> (00.076008)      1: Error (cgroup.c:901): cg: Can't move into cpuset//[PID]/tasks (-1/0): No space left on device
> (00.082249) Error (cr-restore.c:1919): Restoring FAILED.
> 
> Note that the process being migrated has its cgroup directory in the source node, which apparently does not exist in the destination host. So I first mkdir /sys/fs/cgroup/cpu/PID .... and copy the content from the source to destination.
> 
> Is there anything wrong in these steps? Thanks.

If it works afterwards, then no :) But criu can manage cgroups itself with the
--manage-cgroups option, see the http://criu.org/CGroups for details.

-- Pavel