dovecot - Jan 2022 - S3 integration w Dovecot

Good morning, day, evening :P

As stated on documentation S3-compatible Storages ? Dovecot documentation
<https://doc.dovecot.org/configuration_manual/mail_location/obox/s3/> only
AWS S3 is officially supported.

However, we know that Scality has been successfully integrated at some
larger corporations.

Particularly curious if anyone has integrated with Pure S3 object storage
solution, or any other for that matter?

Just looking at some different options.

-
Sincerely,
Martin.
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> On 21. Jan 2022, at 19.38, Martin Olsen <martin.olsen.dev at
gmail.com> wrote:
> 
> Good morning, day, evening :P
> 
> As stated on documentation S3-compatible Storages ? Dovecot documentation
<https://doc.dovecot.org/configuration_manual/mail_location/obox/s3/> only
AWS S3 is officially supported.
> 
> However, we know that Scality has been successfully integrated at some
larger corporations.
> 
> Particularly curious if anyone has integrated with Pure S3 object storage
solution, or any other for that matter?
> 
> Just looking at some different options.

Dovecot Object Storage plugin is commercial offering from Open-Xchange. I
suggest you contact their sales for information.

Sami
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I have been testing a bit with ceph object storage.  I think I will start using
this at some point, when I need to scale. I had a container of just 50MB or so
that was able to use TB's storage.

https://github.com/ceph-dovecot/dovecot-ceph-plugin

> On 01/21/2022 10:38 AM Martin Olsen <martin.olsen.dev at gmail.com>
wrote:
> 
> As stated on documentation S3-compatible Storages ? Dovecot documentation
https://doc.dovecot.org/configuration_manual/mail_location/obox/s3/ only AWS S3
is officially supported.
> 
> However, we know that Scality has been successfully integrated at some
larger corporations.
> 
This is correct, Scality is a partner of Open-Xchange for OX Dovecot Pro
installations, and is a supportable storage solution.

> Particularly curious if anyone has integrated with Pure S3 object storage
solution, or any other for that matter?
> 
This support is provided through Scality's sproxyd interface, not S3. See
https://doc.dovecot.org/admin_manual/obox/scality_key_format/ 
https://doc.dovecot.org/admin_manual/obox/scality_key_format/.  sproxyd allows
us to provide a fully geo-redundant solution that can support Dovecot and the
mail storage in multiple active data centers.  S3 support is limited to a single
data center/region due to limitations of the S3 protocol.

For OX Dovecot Pro, we only support "AWS S3" for SLA purposes.  This
is for several reasons:
* There is no "official" S3 spec. Thus, you have to certify against
specific vendors - it is not possible to certify generally against the protocol.
Be very wary of a provider that claims they are "fully AWS S3"
compliant - what does that mean if there is no formalized spec?
* Experience has shown us that many S3 installations cannot handle the mail
loads in larger Dovecot installations.  After they reach specific loads, they
can enter a death spiral and/or become unresponsive.
* It is impossible to support a customer that just installs S3 software
themselves and creates their own storage array.  This is a custom/bespoke
project.  The purpose of the OX Dovecot Pro product is to provide a full email
system out of the box without the need for custom development.
michael
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