Privileged LXC group IDs different to host after restore

[mike604]

Hi,

I have just done a clean install of PVE 8.1.3 after changing some hardware in the host. I have restored my Plex LXC and some of the groups have different IDs in the container than the host which is breaking my GPU transcoding.

The render group is ID 107 in the LXC but 104 on the host. On the previous install, these were the same.

I have tried to change the owner from the LXC back to render which also changed the owner to messagebus on the host.

Is there a way to reset these group mappings?

Thanks

 

[fweber]

Hi, can you show the container config, i.e., the output of pct config VMID (change VMID accordingly)? Is a privileged container, or do you have any LXC uid/gid mappings [1] in place?

Do you access /dev/dri/renderD128 only inside the container, or also on the host? If you access it only inside the container, it shouldn't really matter what group owns it on the host. One option would be to change its group to the gid of the render group inside the container, which is 107: chown root:107 /dev/dri/renderD128

[1] https://pve.proxmox.com/wiki/Unprivileged_LXC_containers