upgrading with murder/aggregator

Ragnar Sundblad ragge at csc.kth.se
Fri May 28 15:38:10 EDT 2010

On 28 maj 2010, at 19.58, Andrew Morgan wrote:

> On Fri, 28 May 2010, Ragnar Sundblad wrote:
>> Is murder/aggregator backwards compatible with older imap
>> servers?
>> We want to migrate form a single 2.1.18 cyrus imap server to
>> multiple 2.3.x servers. An idea is to insert a common
>> murder/aggregator in front of both the 2.1.18 server and the
>> new servers, and seamlessly migrate users. Would this be
>> doable?
> Yes, you can do this.  However, your frontend proxy server must be running the old version until all of your backends have been upgraded.
> Version 2.3 of the proxy server tries to issue commands to the backends that older version of Cyrus do not support.  I don't know if there are other incompatibilities between 2.1 and 2.2.
> As always, it is a good idea to test this before exposing it to your users.  I suggest bringing up a 2.3 mupdate master, 2.3 backend, and 2.1 frontend.  Then, use Cyrus' built-in mailbox rename/move feature to migrate a mailbox from the 2.1 backend to the 2.3 backend.  Test, test, test!

Ok, thank you very much for the tip!

This kind of information will probably save me and others many hours of


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