Backup of container to NAS fails

[network_potato]

Hello,

I have my Synology NAS attached as NFS storage. Backing up regular VMs to the NAS is no problem, but trying to back up a container I get the following error:

INFO: starting new backup job: vzdump 301 --compress zstd --node hyp1 --mode snapshot --storage nas1 --remove 0 --notes-template '{{guestname}}'
INFO: Starting Backup of VM 301 (lxc)
INFO: Backup started at 2022-10-23 11:04:08
INFO: status = running
INFO: CT Name: <removed>
INFO: including mount point rootfs ('/') in backup
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: create storage snapshot 'vzdump'
INFO: creating vzdump archive '/mnt/pve/nas1/dump/vzdump-lxc-301-2022_10_23-11_04_08.tar.zst'
INFO: tar: /mnt/pve/nas1/dump/vzdump-lxc-301-2022_10_23-11_04_08.tmp: Cannot open: Permission denied
INFO: tar: Error is not recoverable: exiting now
INFO: cleanup temporary 'vzdump' snapshot
ERROR: Backup of VM 301 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/nas1/dump/vzdump-lxc-301-2022_10_23-11_04_08.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' ./ | zstd --rsyncable '--threads=1' >/mnt/pve/nas1/dump/vzdump-lxc-301-2022_10_23-11_04_08.tar.dat' failed: exit code 2
INFO: Failed at 2022-10-23 11:04:09
INFO: Backup job finished with errors
TASK ERROR: job errors

Can someone help me figure out the problem?

 

[Dunuin]

For unprivileged LXCs the UID 100000 needs also write access to your NFS share. So you either need to modify your NFS server to allow that or alternatively you could change the "tmpdir" in "/etc/vzdump.conf" to some folder like "/tmp" with 777 rights.

 

[florism]

For unprivileged LXCs the UID 100000 needs also write access to your NFS share. So you either need to modify your NFS server to allow that or alternatively you could change the "tmpdir" in "/etc/vzdump.conf" to some folder like "/tmp" with 777 rights.

Had the same problem, your hin fixed it Thx