[lxc-users] "overlayfs: missing upperdir or lowerdir or workdir." Can it be ignored?

[Ingvar Bogdahn]

Hi again,

I'm having another problem with overlayfs and unprivileged lxc 
containers. When cloning with overlayfs, I get
"overlayfs: missing upperdir or lowerdir or workdir"
but cloning appears to succeed.

I was using ubuntu 14.04 as host OS. Since overlayfs got kernel support 
in 3.19 kernels, I updated the kernel to 3.19 using the packages 
linux-headers-generic-lts-vivid  & linux-image-generic-lts-vivid. I then 
recreated a new mother container, without adding a user to it. I cloned 
it again using lxc-clone -o mother2 -n overlay2 -B overlayfs -s  and got 
again the error:

[130.841743] overlayfs: missing upperdir or lowerdir or workdir
Created container XY as snapshot of X

Although it starts the clone despite that error, I still keep getting 
"failed to whiteout" and "Operation not permitted" when doing lengthy 
installations, see previous thread.

Here:
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1409425
they report the same problem with lxc-start-ephemeral, and claim it to 
be fixed with current version. After upgrading to lxc version to 1.1 
using the ppa:ubuntu-lxc/daily, I still get
"overlayfs: missing upperdir or lowerdir or workdir"

However, fortunately after the update to lxc 1.1, non-trivial 
installations succeed !! I tried by installing wordpress and > 150MB of 
dependencies, which repeatedly failed before.

So, my remaining question is: can the error message be simply ignored?
"overlayfs: missing upperdir or lowerdir or workdir."


Thanks for clarification,

Ingvar
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