Backup failed reason EACCESS: Permission denied

[PurpleCloud]

Hi,
Sometimes backup failed with a similar message :

ERROR: backup write data failed: command error: write_data upload error: pipelined request failed: inserting chunk on store 'ds_01' failed for c878381da568759df2de9b6bfc4edc4b16fb7567d7fc61ddfd90ab74aa7134bc - mkstemp "/mnt/ds_01/.chunks/c878/c878381da568759df2de9b6bfc4edc4b16fb7567d7fc61ddfd90ab74aa7134bc.tmp_XXXXXX" failed: EACCES: Permission denied
INFO: aborting backup job

ds_01 is a NFS Datastore.
proxmoxbackup and pve nodes are granted to have all access to this datastore.

Where can i find more information about this error ?

Thanks for your help

 

[UdoB]

First guess out of the blue:

My .chunks folders are owned by

/pbspool/pbs0/.chunks# ls -al | head -n2
total 6340737
drwxr-x--- 65538 backup backup 65538 Aug 27  2023 .

The user with the name "backup" must have write access. It is not sufficient if "root" can write data.

 

[PurpleCloud]

First guess out of the blue:

My .chunks folders are owned by

/pbspool/pbs0/.chunks# ls -al | head -n2
total 6340737
drwxr-x--- 65538 backup backup 65538 Aug 27  2023 .

The user with the name "backup" must have write access. It is not sufficient if "root" can write data.

Thank you. I reviewed my share configuration, and i had set the read-write access to the proxmox backup server host. The controler is a netapp filer.

 

[UdoB]

I reviewed my share configuration,

Did you verify that "backup" can write data?

and i had set the read-write access to the proxmox backup server host.

The host is not the problem, the user "backup" (possibly) is.

Does this work, run inside your .chunks folder:

root@...:/pbspool/pbs0/.chunks# su  -p backup -c  "touch testfile"

root@...:/pbspool/pbs0/.chunks# ls -al testfile
-rw-r--r-- 1 backup backup 0 Apr 21 11:37 testfile

 

[PurpleCloud]

Did you verify that "backup" can write data?



The host is not the problem, the user "backup" (possibly) is.

Does this work, run inside your .chunks folder:

root@...:/pbspool/pbs0/.chunks# su  -p backup -c  "touch testfile"

root@...:/pbspool/pbs0/.chunks# ls -al testfile
-rw-r--r-- 1 backup backup 0 Apr 21 11:37 testfile

yes, it's ok

 

[UdoB]

Well, so my guess was wrong, sorry...

 

[PurpleCloud]

Well, so my guess was wrong, sorry...

no problem. it's alway good to check
thank you. hope i will find a tip...

 

[fabian]

sounds like an NFS issue, could you check the system logs around that time on the PBS and NFS side?

 

[Stoiko Ivanov]

Additionally the complete mount-options might be interesting:
```
mount |grep nfs
```

 

[PurpleCloud]

Additionally the complete mount-options might be interesting:
```
mount |grep nfs
```

I checked both log on the server (dmesg) and the controler side, but i don't find any bug.
Here is the mount options :

ipaddr://ds_01 on /mnt/ds_01 type nfs (rw,noatime,vers=3,rsize=65536,wsize=65536,namlen=255,hard,nolock,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=ipaddr,mountvers=3,mountport=635,mountproto=udp,local_lock=all,addr=ipaddr)

 

[Falk R.]

I checked both log on the server (dmesg) and the controler side, but i don't find any bug.
Here is the mount options :

ipaddr://ds_01 on /mnt/ds_01 type nfs (rw,noatime,vers=3,rsize=65536,wsize=65536,namlen=255,hard,nolock,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=ipaddr,mountvers=3,mountport=635,mountproto=udp,local_lock=all,addr=ipaddr)

Just check the access rights on your NAS.

 

[PurpleCloud]

Just check the access rights on your NAS.

Thank you for the reply.

I already checked the rights on the netapp side. I cannot give more rights...
I have found a topic on the netapp kb library (https://kb.netapp.com/Cloud/BlueXP/...fer_fails_with_Error_EACCES_permission_denied). It seems it could be a lock. That is why the backup is success after i manually retry. The workaround could be an automatic retry on the proxmox backup job side. But i don't think this exists. to be continued...