[lxc-users] ZVOL and zfs support inside a container

[Spike]

Stéphane,

for the use case I have in mind it might actually be ok, I'm just trying to
avoid installing and running some stuff on the root box, but I have no
problems with the entire zfs pool being exposed to this specific container.
How would I go about doing that?

thanks,

Spike

On Sun, Apr 2, 2017 at 11:56 AM Stéphane Graber <stgraber at ubuntu.com> wrote:

> On Sun, Apr 02, 2017 at 06:51:30PM +0000, Spike wrote:
> > Hi,
> >
> > I'm playing with various combinations of virtualization and backends to
> > find the best way to manage some samba and nfs exports and one of the
> > options I'm considering is the following:
> >
> > - run a lxd container backed up by zfs
> > - create a ZVOL on zfs
> > - export the VZOL to the container as a block device
> > - create a zpool from that device inside the container
> > - export that
> >
> > however I can't seem to be able to make the container see and manage zfs
> > stuff. firs off it seems that the container needs to be privileged, which
> > is ok, it's not hosting anything or providing any public services.
> Second,
> > I got the impression that I need to expose the /dev/zfs from the host to
> > the container? is that the case? is there no way to create a second one
> > with access just to the ZVOL?
> >
> > thanks for any help,
> >
> > Spike
>
> ZFS unfortunately doesn't work in containers.
>
> All ZFS configuration goes through /dev/zfs and that device isn't
> namespace aware, so granting access to it in the container would let the
> container see and manage the host zpool.
>
> I've been told a couple of years ago by the ZFS on Linux maintainer that
> they were looking at making ZFS on Linux container aware (in a way
> similar to Solaris' implementation) but I don't believe this has
> resulted to any code being merged at this point.
>
>
> --
> Stéphane Graber
> Ubuntu developer
> http://www.ubuntu.com
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> lxc-users at lists.linuxcontainers.org
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