Proxmox - Guests (VMs and Containers) - Convert a Privileged LXC Container to Unprivileged

NOTE: You cannot just shut the container down, go into the GUI and mark it unprivileged.

Instead, create a backup of the container, and then make a new container from that backup unprivileged.

pct restore 1234 /var/lib/vz/dump/vzdump-lxc-5678-2021_02_03-10_11_12.tar.gz -ignore-unpack-errors 1 -unprivileged

NOTE: where

The 1234 is the new container ID.
The 5678 in the backup file is the old container ID.
- The restore could be set to overwrite the previous container with the restore, but it is safer to just create a new container and then shutdown the old one.

Troubleshooting Errors

If an error is seen:

400 Parameter verification failed.
storage: storage 'local' does not support container directories

then storage needs to be specified.

pct restore 1234 /var/lib/vz/dump/vzdump-lxc-5678-2021_02_03-10_11_12.tar.lzo -ignore-unpack-errors 1 -unprivileged --storage local-zfs