dovecot - Oct 2013 - Transparent Migration from cyrus to dovecot

Hi dovecot people,

We are in the process of preparing the migration from a cyrus 2.1
installation to dovecot.  Dovecot will be installed on new hardware, so
we have separated servers that can/will exist in parallel for a while.

Our goal is to do the migration without interrupting the service for our
users too much.  Currently we tend to using dsync.  So I am asking for
best practice suggestions, tips and hints from people who have done such
a thing before.

Curiously awaiting your replies ;)

Cheers!
PS:  I am subscribed to the list.  So no need to include my address in
replies.  Thanks!
-- 
j.hofm?ller

Optimism doesn't alter the laws of physics.         - Subcommander T'Pol

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Make use of the proxy feature.  You can add a "server" entry into your
userdb, that way you can literally move users over one by one and flip 
their server location.  You can easily test individual users and move 
them over individually.

Works brilliantly

Ed W


On 06/10/2013 11:39, Jogi Hofm?ller wrote:
> Hi dovecot people,
>
> We are in the process of preparing the migration from a cyrus 2.1
> installation to dovecot.  Dovecot will be installed on new hardware, so
> we have separated servers that can/will exist in parallel for a while.
>
> Our goal is to do the migration without interrupting the service for our
> users too much.  Currently we tend to using dsync.  So I am asking for
> best practice suggestions, tips and hints from people who have done such
> a thing before.
>
> Curiously awaiting your replies ;)
>
> Cheers!
> PS:  I am subscribed to the list.  So no need to include my address in
> replies.  Thanks!

Hey Jogi,

On 06.10.2013 12:39, Jogi Hofm?ller wrote:
> Our goal is to do the migration without interrupting the service
> for our users too much.  Currently we tend to using dsync.  So I am
> asking for best practice suggestions, tips and hints from people
> who have done such a thing before.
I work for NetCologne GmbH, an ISP in Cologne, Germany. I did a talk
"Austausch einer ISP-Mailplattform ohne Downtime" at the mail server
conference the Heinlein-Support company held in Berlin in 2011.

 https://www.youtube.com/watch?v=kLQOkiBebU0

It's sure a bit dated and we started with dovecot 1.2.x, so no dsync
available. But maybe it's a least somewhat entertaining to watch how
we did things and avoided downtime.


Regards

Christian