[CRIU] Restore CRIU image across a host

[Hui Kang]

Hi, Tycho,
Thanks. I will work on this patch soon.

- Hui

On Tue, Aug 4, 2015 at 5:43 PM, Tycho Andersen <tycho.andersen at canonical.com
> wrote:

> On Tue, Aug 04, 2015 at 05:40:48PM -0400, Hui Kang wrote:
> > Hi, Tycho
> > Thanks for your suggestion. I am using criu RPC calls, where I can not
> find
> > the four mode for cgroup-manager. Instead, it is a bool type value.
> >
> > optional bool                 manage_cgroups  = 24;
> >
> > Should I update my criu version (I am using v1.6)?
>
> Oh, that's probably because the RPC struct wasn't updated to match the
> new CLI options. It looks like in the current tree it is also a bool,
> so updating to master won't help you. I'm sure a patch would be
> welcome, though :)
>
> Tycho
>
> > - Hui
> >
> > On Tue, Aug 4, 2015 at 5:15 PM, Tycho Andersen <
> tycho.andersen at canonical.com
> > > wrote:
> >
> > > On Tue, Aug 04, 2015 at 05:01:14PM -0400, 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.
> > >
> > > You might want to use one of the new `--manage-cgroups full` mode to
> > > do this for you. That said, moving something into cpuset's tasks fails
> > > with ENOSPC for the following reasons (from cpuset(7)):
> > >
> > >        ENOSPC Attempted to write(2) the process ID (PID) of  a  process
> > > to  a  cpuset
> > >               tasks file when the cpuset had an empty cpuset.cpus or
> empty
> > > cpuset.mems
> > >               setting.
> > >
> > >        ENOSPC Attempted to write(2) an empty cpuset.cpus or cpuset.mems
> > > setting  to  a
> > >               cpuset that has tasks attached.
> > >
> > > So depending on what you copied over, it can cause some problems. In
> > > `--manage-cgroups full` mode, criu's code should be smart enough to
> handle
> > > things, though.
> > >
> > > Tycho
> > >
> > > > Is there anything wrong in these steps? Thanks.
> > > >
> > > > - Hui
> > >
> > > > _______________________________________________
> > > > CRIU mailing list
> > > > CRIU at openvz.org
> > > > https://lists.openvz.org/mailman/listinfo/criu
> > >
> > >
>
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