Restore an unprivileged container - need help

[kamanwu]

I have unprivileged containers running, not managed by PVE.

Recreantly, I installed PVE and want to import these unprivileged containers.

I have export them from my old server as *.tar.gz file, and upload them to storage which can hold CT templates.

When I create a new unprivileged CT in PVE by using one template, I get following errors:

Filesystem UUID: ff3e9f82-10d8-4ed8-8ed5-ed3be74f27bb
Superblock backups stored on blocks:
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
extracting archive '/mnt/pve/nas-meme/template/cache/proxy.tar.gz'
tar: backup/snapshots/snap0/rootfs/bin: Cannot change ownership to uid 1000000, gid 1000000: Invalid argument
tar: backup/snapshots/snap0/rootfs/boot: Cannot change ownership to uid 1000000, gid 1000000: Invalid argument
tar: backup/snapshots/snap0/rootfs/dev/console: Cannot mknod: Operation not permitted
tar: backup/snapshots/snap0/rootfs/dev/full: Cannot mknod: Operation not permitted
tar: backup/snapshots/snap0/rootfs/dev/mapper/control: Cannot mknod: Operation not permitted
tar: backup/snapshots/snap0/rootfs/dev/mapper: Cannot change ownership to uid 1000000, gid 1000000: Invalid argument
tar: backup/snapshots/snap0/rootfs/dev/null: Cannot mknod: Operation not permitted

I just check my old container, and saw:

  volatile.last_state.idmap: '[{"Isuid":true,"Isgid":false,"Hostid":1000000,"Nsid":0,"Maprange":1000000000},{"Isuid":false,"Isgid":true,"Hostid":1000000,"Nsid":0,"Maprange":1000000000}]'

It is 1000000 (6 zero), NOT 5 zero.

Is this the reason cause this error?

If it is, how can I fix this?

Thanks.