[CRIU] Fw: Restore Error in Cgroup Systemd

[Z F]

Hi,
I've tried on 1.6 and 2 problems encountered. 1.  opts.manage_cgroups was set as CG_MODE_IGNORE.2. After workaround above issue, migration still failed for same cause.Log attached.
Best RegardsZhang Fan
      From: Cyrill Gorcunov <gorcunov at gmail.com>
 To: Z F <full015zf at yahoo.com> 
Cc: "criu at openvz.org" <criu at openvz.org> 
 Sent: Friday, July 24, 2015 4:41 PM
 Subject: Re: [CRIU] Fw: Restore Error in Cgroup Systemd
   
On Thu, Jul 23, 2015 at 06:46:34AM +0000, Z F wrote:


>    
>    Hi,
>    
>    I am trying migrating a simple shell job between hosts and failed in
>    restore as:
>    
>    (00.042759)  38289: Error (cgroup.c:908): cg: Can't move into
>    systemd//user.slice/user-0.slice/session-741.scope/tasks (-1/-1): No such
>    file or directory
>    (00.043022) Error (cr-restore.c:1193): 38289 exited, status=1
>    (00.044078) Error (cr-restore.c:1867): Restoring FAILED.
>    
>    The environments:
>    [root at compute1 criu-br-1.5-stable]# uname -a
>    Linux compute1 3.12.44 #1 SMP Mon Jul 20 09:16:11 CST 2015 x86_64 x86_64
>    x86_64 GNU/Linux
>    [root at compute1 criu-br-1.5-stable]# ./criu -V
>    Version: 1.5.2
>    [root at compute1 criu-br-1.5-stable]# ./criu restore --images-dir
>    /mnt/nfs/home/zf/criutest/dumps/ --shell-job -v4 
>    Restore log attached.
>    
>    The cause is that for each session in the system a directory created as
>    /sys/fs/cgroup/system/user.slice/user-x.slice/session-y.scope/. While the
>    source and destination have different sessions.
>    
>    Would you please help to solve the problem? Thank you very much.

Please switch to criu 1.6 at least, there were a number of fixes for
cgroups code. To migrate between systemd based nodes you need to prepare
special slice for systemd on source node. See our vzctl tool which
does such thing (https://src.openvz.org/projects/OVZ/repos/vzctl/browse)
In short you need to prepare own slice for your container/application
to be able to migrate it.


  
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