Unable to restore LXC backup on new PVE Install

[smittychifi]

Hi, I just re-installed PVE 7 on a new set of hardware. I had forgotten about some of the settings I had setup on the previous hardware, and was presented with the following errors when trying to restore my container:

recovering backed-up configuration from 'tank-backups:backup/vzdump-lxc-100-2021_12_06-17_12_27.tar.zst'
restoring 'tank-backups:backup/vzdump-lxc-100-2021_12_06-17_12_27.tar.zst' now..
extracting archive '/tank/backups/dump/vzdump-lxc-100-2021_12_06-17_12_27.tar.zst'
lxc 20211208035155.847 ERROR    conf - conf.c:lxc_map_ids:3087 - newuidmap failed to write mapping "newuidmap: uid range [1000-3000) -> [1000-3000) not allowed": newuidmap 112291 0 100000 1000 1000 1000 2000 65534 165534 1
Failed to write id mapping for child process
lxc 20211208035155.847 ERROR    utils - utils.c:lxc_drop_groups:1343 - Operation not permitted - Failed to drop supplimentary groups
lxc 20211208035155.847 ERROR    utils - utils.c:lxc_switch_uid_gid:1318 - Invalid argument - Failed to switch to gid 0
TASK ERROR: unable to restore CT 101 - command 'lxc-usernsexec -m u:0:100000:1000 -m u:1000:1000:2000 -m u:65534:165534:1 -m g:0:100000:100 -m g:100:100:1 -m g:101:100100:899 -m g:1000:1000:2000 -m g:65534:165534:1 -- 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/101/rootfs --skip-old-files --anchored --exclude './dev/*'' failed: exit code 1

This is the configuration file within the backup:

arch: amd64
cores: 12
features: nesting=1
hostname: servarr
memory: 16384
mp0: /SSD-Pool/downloads,mp=/mnt/downloads
mp1: /tank/media,mp=/mnt/media
nameserver: 1.1.1.1
net0: name=eth0,bridge=vmbr0,firewall=1,gw=192.168.1.1,hwaddr=0A:CA:38:B4:4A:C5,ip=192.168.1.55/24,type=veth
onboot: 1
ostype: ubuntu
rootfs: ssd-pool:subvol-100-disk-0,size=50G
searchdomain: 1.1.1.1
swap: 16384
unprivileged: 1
lxc.mount.entry: /dev/net/tun dev/net/tun none bind,create=file
lxc.idmap: u 0 100000 1000
lxc.idmap: u 1000 1000 2000
lxc.idmap: u 65534 165534 1
lxc.idmap: g 0 100000 100
lxc.idmap: g 100 100 1
lxc.idmap: g 101 100100 899
lxc.idmap: g 1000 1000 2000
lxc.idmap: g 65534 165534 1

Is there a way for me to create a new, empty container with the same configuration settings, and then manually unzip the backup file to the rootfs?

 

[oguz]

hi,

I had forgotten about some of the settings I had setup on the previous hardware, and was presented with the following errors when trying to restore my container:

Failed to write id mapping for child process
you'll need to adapt the /etc/subuid and /etc/subgid files on your new host (because you have a custom id mapping for your container). afterwards it should work fine