Instance persistent storage

Apps and Virtualization
1

I am creating a container, that seems all good. Example; creating a container using Ubuntu 24.04 and running updates, install openssh-server and other apps. If I want to add a disk for persistent storage that is where I am running into an issue and am unable to find documentation or and example of what the permissions for that dataset should be. I can add it, it seems to be read only and inside the container it is owned by nobody:nogroup

root@Docker:~# ls -l /mnt/
total 1
drwxr-xr-x 2 nobody nogroup 2 Mar 22 20:29 data

I am unable to change owner in the container unable to write to it etc…

I’d be greatful for a hint.

2

Found some information here:

It appears when mounting disks to a container in Incus it needs to be set to use shiftfs

Setting this on the host at the cli at least gave ownership to root. The truenas UI needs to be able to handle this setting for this usage to work properly.

incus config device set Docker disk0 shift=true

root@truenas[~]# incus config show Docker --expanded            
architecture: x86_64
<truncated output>
config:
devices:
  disk0:
    path: /mnt/data
    shift: "true"
    source: /mnt/ssd-storage/Multi-docker
    type: disk

root@Docker:~# ls -l /mnt/
total 1
-rw-r--r-- 1 root root 0 Mar 24 23:39 1
drwxr-xr-x 2 root root 3 Mar 24 23:39 data
root@Docker:~# ls -l data/
ls: cannot access 'data/': No such file or directory
root@Docker:~# ls -l data
ls: cannot access 'data': No such file or directory
root@Docker:~# ls -l /mnt/data
total 1
-rw-r--r-- 1 root root 0 Mar 24 23:39 testfile
3

This is not recommended. See documentation in RC1 release notes about userns idmapping.