Mount SMB with id shifting

LXD
1

Hi,

I am trying to mount a samba share on a debian 12 (6.1.0-16-amd64) host inside a Ubuntu 22.04 Container.

dpkg -l | grep lxd
ii  lxd                           5.0.2-5                        amd64        Powerful system container and virtual machine manager - daemon
ii  lxd-agent                     5.0.2-5                        amd64        LXD guest agent
ii  lxd-client                    5.0.2-5                        amd64        Powerful system container and virtual machine manager - client

I am following the guides that worked on older versions.

But with id shifting on newer kernels I am a bit lost. When I try to add the mounted smb share, I get the following error.

lxc config device add name lxdshare disk shift=true source=/mnt/path/ path=/mnt/test
Error: Failed to start device "lxdshare": Required idmapping abilities not available

I can add the device without the shift parameter. But then I don’t have write permissions.

Do I have to disable id shifting completely to make it work?

Regards

2

cifs doesn’t support idmap shifting yet. Your best bet is to instead perform the mount from inside the container using a FUSE version of cifs.

smbnetfs looks like a potential candidate for this.

3

If you can add a disk device without shift, maybe try setting up idmap for container? For default ubuntu user with UID 1000 and GID 1000 that would be:

printf "uid $(id -u) 1000\ngid $(id -g) 1000" | lxc config set <container_name> raw.idmap -