[lxc-users] Failed to import LXD container tar.gz in unprivileged container (nested container)

[Stéphane Graber]

Hmm, not sure why you have those devices in this container in the first
place, normally /dev is left empty and mounted as tmpfs in the container.
You could likely just edit the tarball to remove the content of dev/ and
then import it just fine.

On Fri, Nov 22, 2019 at 2:19 AM Chris Han <chrishan308 at gmail.com> wrote:

> Hi,
>
> I have an unprivileged LXD container, c1, running in a physical host. I
> have exported this container to tar.gz:
>
> lxc export c1-unprivileged c1-unprivileged.tar.gz
>
>
> I have created another unprivileged LXD container, c2, with settings for
> nested containers. Inside the c2 container, I am able to launch a
> nested unprivileged LXD container, c3. The c3 container is working fine.
>
> lxc launch ubuntu:18.04 c3-unprivileged-nested
>
>
> However, when I try to import the c1 tar.gz file inside c2 to create a
> nested container, it shows the following error message:
>
> lxc import c1-unprivileged.tar.gz
>
> tar: rootfs/dev/zero: Cannot mknod: Operation not permitted
> tar: rootfs/dev/random: Cannot mknod: Operation not permitted
> tar: rootfs/dev/tty: Cannot mknod: Operation not permitted
> tar: rootfs/dev/null: Cannot mknod: Operation not permitted
> tar: rootfs/dev/full: Cannot mknod: Operation not permitted
> tar: rootfs/dev/urandom: Cannot mknod: Operation not permitted
>
> I am able to import the c1 tar.gz file in a physical host, but unable to
> import it in an unprivileged container (to create a nested container). The
> LXD network and storage settings in the physical host and the c2 container
> are exactly the same.
>
> How to import the c1 tar.gz in the c2 unprivileged container?
>
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> lxc-users at lists.linuxcontainers.org
> http://lists.linuxcontainers.org/listinfo/lxc-users
>


-- 
Stéphane
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