How to restore a container from an archive in Proxmox?

Question

Debian

There are backups of the Zabbix container in Proxmox. After a power outage, the Zabbix container stopped working. When I try to restore from a backup, I get the following error:

Formatting '/var/lib/vz/images/100/vm-100-disk-1.raw', fmt=raw size=107374182400
mke2fs 1.44.5 (15-Dec-2018)
Discarding device blocks:     4096/26214400                 done                            
Creating filesystem with 26214400 4k blocks and 6553600 inodes
Filesystem UUID: d1655f64-50c2-4bc0-b126-f0c1c1e71cbd
Superblock backups stored on blocks: 
  32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
  4096000, 7962624, 11239424, 20480000, 23887872

Allocating group tables:   0/800       done                            
Writing inode tables:   0/800       done                            
Creating journal (131072 blocks): done
Multiple mount protection is enabled with update interval 5 seconds.
Writing superblocks and filesystem accounting information:   0/800       done

extracting archive '/mnt/pve/share/dump/vzdump-lxc-100-2021_03_03-10_21_24.tar.zst'
tar: ./var/spool/postfix/dev/urandom: Cannot mknod: Operation not permitted
tar: ./var/spool/postfix/dev/random: Cannot mknod: Operation not permitted
Total bytes read: 2426286080 (2.3GiB, 232MiB/s)
tar: Exiting with failure status due to previous errors
TASK ERROR: unable to restore CT 100 - command 'lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- tar xpf - --zstd --totals --one-file-system -p --sparse --numeric-owner --acls --xattrs '--xattrs-include=user.*' '--xattrs-include=security.capability' '--warning=no-file-ignored' '--warning=no-xattr-write' -C /var/lib/lxc/100/rootfs --skip-old-files --anchored --exclude './dev/*'' failed: exit code 2

Answer 1

Remove the unprivileged flag when restoring, otherwise the device mapping will not be created.