Backup VM works, Lxc not

[t_heinrich]

Hello,

my backup target is a nfs share on my Synology.
I try to backup all my VM und LXC.
Backing up my VM (Win10) works fine, but I get errors for LXC.
Do you have a hint for me?

Regards Thomas

INFO: starting new backup job: vzdump 101 --mailnotification failure --node proxmox --compress lzo --storage proxmox --all 0 --quiet 1 --mode snapshot[COLOR=rgb(184, 49, 47)][/COLOR] INFO: Starting Backup of VM 101 (lxc) INFO: Backup started at 2021-05-24 06:53:07 INFO: status = running INFO: CT Name: UniFi INFO: including mount point rootfs ('/') in backup INFO: backup mode: snapshot INFO: ionice priority: 7 INFO: create storage snapshot 'vzdump' Logical volume "snap_vm-101-disk-0_vzdump" created. INFO: creating vzdump archive '/mnt/pve/proxmox/dump/vzdump-lxc-101-2021_05_24-06_53_07.tar.lzo' [B][COLOR=rgb(184, 49, 47)]INFO: tar: /mnt/pve/proxmox/dump/vzdump-lxc-101-2021_05_24-06_53_07.tmp: Cannot open: Permission denied INFO: tar: Error is not recoverable: exiting now[/COLOR][/B] INFO: cleanup temporary 'vzdump' snapshot Logical volume "snap_vm-101-disk-0_vzdump" successfully removed ERROR: Backup of VM 101 failed - command 'set -o pipefail && lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- tar cpf - --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' --one-file-system '--warning=no-file-ignored' '--directory=/mnt/pve/proxmox/dump/vzdump-lxc-101-2021_05_24-06_53_07.tmp' ./etc/vzdump/pct.conf ./etc/vzdump/pct.fw '--directory=/mnt/vzsnap0' --no-anchored '--exclude=lost+found' --anchored '--exclude=./tmp/?*' '--exclude=./var/tmp/?*' '--exclude=./var/run/?*.pid' ./ | lzop >/mnt/pve/proxmox/dump/vzdump-lxc-101-2021_05_24-06_53_07.tar.dat' failed: exit code 2 INFO: Failed at 2021-05-24 06:53:08 INFO: Backup job finished with errors TASK ERROR: job errors

 

[dietmar]

Seems there is a permission problem on /mnt/pve/proxmox/. Please make sure user 'root' can access and write that mount point.

 

[t_heinrich]

Hi Dietmar,
I use the same backup-job for my VM and this works without problems.
That's why I'm wondering.

 

[dietmar]

What kind of storage is /mnt/pve/proxmox/ exactly?

 

[t_heinrich]

Hi Dietmar,
the target is a Synology. Here are my settings:

 

[t_heinrich]

OK it seems that "my" problem is that I'm using "Unprivileged LXC containers".
I read that I should backup and reinstall the LXC container to change from unprivileged to privileged.
But I can't backup.

 

[t_heinrich]

OK, I solved it with a local backup.
Then I put the local backup back and changed from unprivileged to privileged.