Dovecot permission denied errors on NFS after upgrade to 2.2.17

[Claudio Corvino]

Hi Jochen,

the ID has not changed, in addition the "permission denied" error is 
random, most of the time Dovecot works well.

How can I check the mappings NFS uses?

After the Debian upgrade I was using these NFS mount options:

rw,user,rsize=8192,wsize=8192,timeo=30,intr

Now trying to fix the problem I set "defaults" mount option, but nothing 
has changed.

Thanks

On 13/07/20 13:08, Jochen Bern wrote:
> On 07/13/2020 12:57 PM, Claudio Corvino wrote:
>> we just upgraded our mail server from Debian 8 to Debian 9, so our
>> dovecot packages just got upgraded from version 2.2.13 to 2.2.17.
> [...]
>> Every directory and sub-dir under
>> 	/mnt/mail-storage
>> is assigned to vmail:vmail with
>> 	drwx------
>> permission set.
> Just a quick shot into the dark, you verified the ownerships on the NFS
> *client*, not the NFS *server*, yes? Because NFS speaks UIDs and GIDs,
> not their names, so if your Debian 9 installation assigned different IDs
> to "vmail" ...
>
> (You might also want to check what mappings the NFS mount uses,
> including possible *default* behaviour.)
>
> Good luck,


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