Backup container error : failed: exit code 2

I

issa2020

Active Member
Sep 9, 2020
85
4
28
Hello, i got some Cotnainer on Proxmox and i need to backu them, but all container got error message

can u help to found what is wrong please :

1696753663935.png



i got this error :


Bash: 
INFO: starting new backup job: vzdump 112 --compress zstd --remove 0 --notes-template '{{guestname}}' --mode snapshot --node proxmox2 --storage NFS2
INFO: Starting Backup of VM 112 (lxc)
INFO: Backup started at 2023-10-08 10:27:49
INFO: status = running
INFO: CT Name: heimdalldashboard
INFO: including mount point rootfs ('/') in backup
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: create storage snapshot 'vzdump'
  WARNING: You have not turned on protection against thin pools running out of space.
  WARNING: Set activation/thin_pool_autoextend_threshold below 100 to trigger automatic extension of thin pools before they get full.
  Logical volume "snap_vm-112-disk-0_vzdump" created.
  WARNING: Sum of all thin volume sizes (1.78 TiB) exceeds the size of thin pool LUN02/LUN02 and the size of whole volume group (931.51 GiB).
INFO: creating vzdump archive '/mnt/pve/NFS2/dump/vzdump-lxc-112-2023_10_08-10_27_49.tar.zst'
INFO: tar: /mnt/pve/NFS2/dump/vzdump-lxc-112-2023_10_08-10_27_49.tmp: Cannot open: Permission denied
INFO: tar: Error is not recoverable: exiting now
INFO: cleanup temporary 'vzdump' snapshot
  Logical volume "snap_vm-112-disk-0_vzdump" successfully removed.
ERROR: Backup of VM 112 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/NFS2/dump/vzdump-lxc-112-2023_10_08-10_27_49.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/NFS2/dump/vzdump-lxc-112-2023_10_08-10_27_49.tar.dat' failed: exit code 2
INFO: Failed at 2023-10-08 10:27:50
INFO: Backup job finished with errors
TASK ERROR: job errors

thanks
 
Code: 
tar: /mnt/pve/NFS2/dump/vzdump-lxc-112-2023_10_08-10_27_49.tmp: Cannot open: Permission denied

That's your problem. You're not allowed to create the file mentioned above.
 
LnxBil said:
Code: 
tar: /mnt/pve/NFS2/dump/vzdump-lxc-112-2023_10_08-10_27_49.tmp: Cannot open: Permission denied

That's your problem. You're not allowed to create the file mentioned above.
Click to expand...
i do that with the proxmox web interface, how i can change the rights on the folder ?
 
but that's work for all VM machine, and only not working for CT ?

well i m using samba now and works for the CT machine and NFS for full VM

thanks all
 
Hi,
issa2020 said:
but that's work for all VM machine, and only not working for CT ?
Click to expand...
for unprivileged containers, the backup is done unprivileged with lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536, so you'd need the unprivileged user to also have the correct access rights on the NFS.

EDIT: This applies for the tmpdir (which is on the backup storage by default).
 
Last edited:
Hey!
Thx this workaround fixed this bug... adding the tmpdir: /tmp in the config file.

But, I'm thinking to the future... when the HDD will not have enough space to store the temp file in the /tmp folder...
Better to add the tmp folder in my USB disk (used for backup files) ? Or performance problem ?

Thx !

PS : this is not so friendly to not having backup working nice with a fresh install, I'm discovering Proxmox and it has given a little anxiety ;)
 
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