Debian 12.5 / ZFS 2.1.x / Incus 6.1 / Containers - problem installing docker

Incus
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1

Hello,

Debian 12.5 is using ZFS version 2.1.x. When using ZFS storage pool with Incus, there seems to be a problem related to this driver version that affects containers - problem when trying to installing docker container (docker-compose up -d).

The error message could be different with different dockers. For example:
“ERROR: failed to register layer: unlinkat /var/cache/debconf: invalid argument”.

As far as I understand, it is fixed with ZFS 2.2.x (others have complained similar issues with Proxmox). There seems to be some movement on Debian side [https://tracker.debian.org/pkg/zfs-linux], (https://tracker.debian.org/pkg/zfs-linux) but is there any known solution from Incus for Debian 12.x + ZFS 2.1.x version besides using VM instead of container?

Regards
_R

2

Create a block based volume on the ZFS pool and attach that to the container.

incus storage volume create default docker zfs.block_mode=true size=50GiB
incus config device add YOUR-CONTAINER docker disk pool=default source=docker path=/var/lib/docker

1 Like
3

Thank you! That did the trick.

4

Isn’t 2.2 released on Debian 12 now? In Backports.
https://tracker.debian.org/pkg/zfs-linux

5

Yes, it is.

If you want to use it, then modify apt sources:

sh -c 'cat <<EOF >> /etc/apt/sources.list
deb http://deb.debian.org/debian bookworm-backports main contrib non-free
EOF'

apt update

apt install -t bookworm-backports zfsutils-linux
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