[lxc-users] Question regarding container affecting the system mounts

[Ronak Desai]

I am able to workaround this issue by marking the mount as unbinadable
and clearing the flag (CL_COPY_UNBINDABLE) in "copy_tree" function in
fs/namespace.c. This skips the unbindable mounts to get cloned inside
the new namespace. For my use-case this is acceptable.

On Wed, Mar 28, 2018 at 12:26 PM, Ronak Desai
<ronak.desai at rockwellcollins.com> wrote:
> Hi,
>
> I came a cross a problem where if the containers are running then it
> affects the unmount process of the system's mount points. I am not
> using these mount points as shared partitions with container.
>
> For example, I am using SD card and NAND as external storage device
> and mounting it to a mount point in the ramfs. Then I am launching
> containers and then when I try to unmount the NAND partition then my
> "unmount" call succeeds but I don't see the UBIFS hooks being called
> and because of that my UBI detach process fails. When I stopped the
> container then I see that kernel is calling the unmount as I see my
> debug prints inside the UBIFS for unmounting that partition. It seems
> like the calls are buffered/queued because of container.
>
> If I tried to mount my NAND partition once the container is up and try
> to unmount then it does unmount and detach without issue. It seems
> like there is an issue with namespace.
>
> I am using 4.1.8 kernel . Please let me know if you need any
> additional detail from my end.
>
> Thanks in advance !
>
> --
> Ronak A Desai
> Sr. Software Engineer
> Airborne Information Solutions / RC Linux Platform Software
> MS 131-100, C Ave NE, Cedar Rapids, IA, 52498, USA
> Ronak.Desai at rockwellcollins.com
> https://www.rockwellcollins.com/



-- 
Ronak A Desai
Sr. Software Engineer
Airborne Information Solutions / RC Linux Platform Software
MS 131-100, C Ave NE, Cedar Rapids, IA, 52498, USA

Phone : 319-263-2667 / VPN : 263-2667

Ronak.Desai at rockwellcollins.com

https://www.rockwellcollins.com/