CHOWN Permission Denied Errors during VZDUMP container backup from Proxmox GUI

When using Proxmox I have always backedup my containers into a shared NFS storage. Usually I would use Open Media Vault (OMV) to host the NFS service. It is a bit slow sometime, but it has worked well in version 4. When I tried to do the same in Proxmox 5.x I was surprise to find these errors during backup:

INFO: starting new backup job: vzdump 110 --storage omvbak1_sdb1tb --compress lzo --mode snapshot --node e4 --remove 0 INFO: Starting Backup of VM 110 (lxc) INFO: status = running INFO: CT Name: posidev INFO: mode failure - some volumes do not support snapshots INFO: trying 'suspend' mode instead INFO: backup mode: suspend INFO: ionice priority: 7 INFO: CT Name: posidev INFO: temporary directory is on NFS, disabling xattr and acl support, consider configuring a local tmpdir via /etc/vzdump.conf INFO: starting first sync /proc/27345/root// to /mnt/pve/omvbak1_sdb1tb/dump/vzdump-lxc-110-2018_09_07-08_22_21.tmp INFO: rsync: chown "/mnt/pve/omvbak1_sdb1tb/dump/vzdump-lxc-110-2018_09_07-08_22_21.tmp/." failed: Operation not permitted (1) INFO: rsync: chown "/mnt/pve/omvbak1_sdb1tb/dump/vzdump-lxc-110-2018_09_07-08_22_21.tmp/bin" failed: Operation not permitted (1) INFO: rsync: chown "/mnt/pve/omvbak1_sdb1tb/dump/vzdump-lxc-110-2018_09_07-08_22_21.tmp/bin/bzcmp" failed: Operation not permitted (1) INFO: rsync: chown "/mnt/pve/omvbak1_sdb1tb/dump/vzdump-lxc-110-2018_09_07-08_22_21.tmp/bin/bzegrep" failed: Operation not permitted (1) INFO: rsync: chown "/mnt/pve/omvbak1_sdb1tb/dump/vzdump-lxc-110-2018_09_07-08_22_21.tmp/bin/bzfgrep" failed: Operation not permitted (1) INFO: rsync: chown "/mnt/pve/omvbak1_sdb1tb/dump/vzdump-lxc-110-2018_09_07-08_22_21.tmp/bin/bzless" failed: Operation not permitted (1)

When I read the error message carefully, it complained about working inside temporary directory on NFS:

INFO: temporary directory is on NFS, disabling xattr and acl support, consider configuring a local

tmpdir via /etc/vzdump.conf so I did some research and found out that was indeed NOT GOOD! So I edited by /etc/vzdump.conf (must be edited manually in each hardware node)

from:

 to:





SEE HOW THE FIRST LINE is different? Instead of DIR it is now pointing to my local RAID1 array mounted on /mnt/md0/tmp

That basically fixed my problem!  I can now backup by Proxmox containers to my NFS shared storage just like before. 

I hope this article helps someone to solve this issue.

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Thanks

--Andrew