Permission denied on LXE containers but not on VM's

[Guillermo Dewey]

Hi, I did a v8 a fresh and new install and restored 4 vms and created brand new CT over ubuntu templates. Did a back up ALL machines but CT give this errors. Only one NFS storage is configure with proven full access.. all vms get backedup but not LXE machines. any idea?

tks

INFO: starting new backup job: vzdump 106 --compress zstd --notes-template '{{guestname}}' --storage SYNOLOGY --node proxmox-kb1 --mode snapshot --remove 0
INFO: Starting Backup of VM 106 (lxc)
INFO: Backup started at 2023-07-06 09:18:29
INFO: status = running
INFO: CT Name: NextCloud
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/SYNOLOGY/dump/vzdump-lxc-106-2023_07_06-09_18_29.tar.zst'
INFO: tar: /mnt/pve/SYNOLOGY/dump/vzdump-lxc-106-2023_07_06-09_18_29.tmp: Cannot open: Permission denied
INFO: tar: Error is not recoverable: exiting now
INFO: cleanup temporary 'vzdump' snapshot
ERROR: Backup of VM 106 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/SYNOLOGY/dump/vzdump-lxc-106-2023_07_06-09_18_29.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 '--threads=1' >/mnt/pve/SYNOLOGY/dump/vzdump-lxc-106-2023_07_06-09_18_29.tar.dat' failed: exit code 2
INFO: Failed at 2023-07-06 09:18:29
INFO: Backup job finished with errors
TASK ERROR: job errors

 

[alexskysilk]

INFO: tar: /mnt/pve/SYNOLOGY/dump/vzdump-lxc-106-2023_07_06-09_18_29.tmp: Cannot open: Permission denied

you need to make sure you synology has permissions for your nfs connection/user to write.

 

[Guillermo Dewey]

you need to make sure you synology has permissions for your nfs connection/user to write.

the NFS storage is the same for VM or CT. All vms can write the dump but not the LXC dump. NFS storage has full access and its no different from VM.

 

[Guillermo Dewey]

just to enlight the thread solution was to set the NFS to

Squash -> Map all users to admin on the NFS side (in my case a synology NAS)

 

[jvince11]

just to enlight the thread solution was to set the NFS to

Squash -> Map all users to admin on the NFS side (in my case a synology NAS)

Squash -> Map all users to admin
This indeed was the solution for me as well - exact same problem. PVE backup job with VM's and LXC's with only LXC's failing. vzdump folder is a NFS share exported from Synology NAS.