[systemd-devel] systemd-nspawn overlay and rootfs

[Juanjo Presa]

Ok, thanks for your reply.

Any suggestion to achieve something similar? I'm trying with btrfs
subvolumes but I don't get to make union of /usr from OS subvolume with
/usr from runtime subvolume

Nowadays I'm workarouding with:

systemd-nspawn
--overlay=/var/lib/machines/os/usr:/var/lib/machines/runtime/usr:/usr -D
/var/lib/machines/os --machine=foo -b -x

On Fri, Aug 19, 2016 at 1:02 PM, Lennart Poettering <lennart at poettering.net>
wrote:

> On Tue, 16.08.16 15:43, Juanjo Presa (juanjop at gmail.com) wrote:
>
> > Hi, I'm trying to compose a container with several layers and join
> together
> > with overlay option but seems that is not supported.
> >
> > I want to get something like:
> > systemd-nspawn --overlay=/foo/ubuntu-base:/foo/app-runtime:/foo/app:/ -D
> > /foo/bar --boot
> >
> > Maybe I'm misunderstanding the overlay option.
> >
> > So, what do you suggest to accomplish a similar model. Maybe just mount
> the
> > desired overlay sideways in /foo/bar and dismiss systemd-nspawn overlay
> > option? Something similar with btrfs subvolumes?
> >
> > Thanks in advance.
>
> Yeah, we currently do not support overlayfs as root dir, see
>
> https://github.com/systemd/systemd/issues/3847
>
> We should probably make that work. But do note that overlayfs
> introduces as many new problems as it solves IRL... Because of that
> there's no first level support for it in place right now (i.e. no
> support for using it as backing for --ephemeral or so).
>
> Lennart
>
> --
> Lennart Poettering, Red Hat
>
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