Antwort: Re: Two sites, two CipherMail servers, two database servers - what's the simple(st) solution?

Vielen Dank, Herr Prof. Schefczyk!

This is an infrastructure very similar to what I'd create myself. With your
feedback I'm sure, I'll give this setup a try.

Immer für Sie da
Ihr Thomas Bahn

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Thomas Bahn

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Von: "Prof. Dr. Michael Schefczyk via Users"
An: "users(a)" <users(a)>
Kopie: "tbahn(a)" <tbahn(a)>, "Prof. Dr. Michael
            Schefczyk" <michael(a)>
Datum: 03.06.2021 09:26
Betreff: Re: Two sites, two CipherMail servers, two
            database servers - what's the simple(st) solution?

Dear All,

I can confirm that a MariaDB Galera cluster does work well. My own
experience is from being a two location SOHO user. I run mailservers on
both premises. My outbound mail is 50:50 from both locations and my inbound
mail is ca. 95:5. My setup from an outside perspective is an ASSP server
first, then a ChipherMail server and then a Kopano Mailserver. I have a
three node MariaDB Galera cluster based on standard Debian 10 packages on
three virtual machines, two in my primary location and one in the secondary
location. The OpenVPN connection is performing sufficiently well for the


Michael Schefczyk

-----Ursprüngliche Nachricht-----
Von: Martijn Brinkers via Users <users(a)>
Gesendet: Mittwoch 2 Juni 2021 10:51
An: users(a)
CC: tbahn(a); Martijn Brinkers <martijn(a)>
Betreff: Re: Two sites, two CipherMail servers, two
database servers - what's the simple(st) solution?

On Tue, 2021-06-01 at 05:24 +0000, tbahn--- via Users wrote:
> We have two sites each with an MTA and MX record. We think about
> introducing CipherMail into our infrastructure.
> Obviously, there is a way using MariaSQL/MySQL and Galera Cluster,
> HAproxy, ... to create a "real" cluster. With at least three nodes
> and a lot of overhead, this seems to be a little too much for our use
> case.
> I thought of a solution with PostgreSQL, backup, transfer backup to
> the other site, restore there, automated as a cron job.
> Configuration would only be possible on the "master" site, but that's
> okay.
> The database on the "slave" site would be overwritten regularly.
> In your opinion, what do you think would be a simple solution for my
> use case?
> Would my idea even work?

The best setup is to use a master/master database like Galera. If you
use a primary and secondary server, you need to make sure you never
write data to the secondary server because that will be overwritten
when the primary server syncs to the secondary server.

The secondary server will add or update the database in various cases.
For example if you receive digitally signed email, the certificate will
be extracted and added to the database. Or, if you send a PDF encrypted
email with the password auto-generated, a user object for the recipient
will be added. If this happens on the secondary server, those changes
will be overwritten.

The best setup is therefore to use a master/master database.

If you use a primary/secondary database, make sure all database changes
are applied to the primary database. This requires that a fail-over is
done to the secondary when the primary fails.

If you can be certain that changes are only applied to one database
(primary), then you can periodically sync the primary to the secondary
database without fail-over.

Kind regards,

Martijn Brinkers

CipherMail email encryption
Email encryption with support for S/MIME,
OpenPGP, PDF Messenger and Webmail Messenger