[lxc-users] LXC, criu and cgroups...

[Dirk Geschke]

Hi Tycho,

I'm now one step ahead, I head a file 00-lxcfs.conf from playing
around with lxcfs. But this one is not needed with lxc-1.1.x
As a consequence, cgroup was bind-mounted twice in the container.

Now at least lxc-checkpoint does not have a problem with the
mounts of cgroup. Now I end up with:

   Command "save" is unknown, try "ip addr help".
   Error (util.c:580): exited, status=255
   Error (net.c:420): IP tool failed on addr save
   Error (namespaces.c:802): Namespaces dumping finished with error 65280
   Error (cr-dump.c:1979): Dumping FAILED.

Sounds like ip is missing the save option for addr. Maybe the 
namespace-error is a follow up.

Ah, with a recompiled package iproute2 from jessie on wheezy this 
seems to work.

So I can now checkpoint an unprivileged container on debian wheezy
with lxc-checkpoint. But still no luck with LXD so far, it is still
complaining:

   Found cgmanager mapping for ./sys/fs/cgroup/cgmanager mountpoint
   Found cgmanager mapping for ./sys/fs/cgroup/cgmanager mountpoint
   Error (mount.c:636): 92:./sys/fs/cgroup/cgmanager is overmounted

And there is no 00-lxcfs.conf on this system. In the container I
can see two cgroup mounts:

   cgroup                       4       0         4   0% /sys/fs/cgroup
   cgroup                      12       0        12   0% /sys/fs/cgroup/cgmanager

This is similar to the non-LXD case.

So actually I'm a little bit clueless here...

Best regards

Dirk

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