Re: [Mailsync-list] Migrating cyrus imap Suse Emailserver 3 to Debian/testing

[Tomas P. <tp...@so...>]

First: if you're in hurry, you have a good chance to shoot your user's 
mailboxes in their feet. So take a step back look at the options, test 
first and transfer after. Especially: test whether seen flags will be 
preserved, since with c-client that is a bit problematic.

On Sat, 11 Sep 2004, Sascha Wuestemann wrote:

> I am to migrate a running emailserver "Suse Emailserver 3" shipped with
> cyrus-imapd v2.0.16 to an up-to-date debian/testing with cyrus21-*
> v2.1.16. The new system shall replace the old and shall have all
> mailboxes containing full content and also all shared folders with full
> content - seen-information shall be original of all content, too. The
> emailusers shall notice no difference in use to the change.

Last time I looked, cyrus had a user-mail export script. At least cyrus 
from debian. So theoretically you can:

 	for u in users; do cyrus-mail-export $u; done

> The new debian emailserver is ready tested to take the old messages.
>
> I have access to both email servers and backupserver filesystems, and I
> am ordered not to stress the running server. So I'd like to use mailsync
> migrating from a local directory containing the old emailservers
> files.
>
> My worries are, that the folder structure of old and new cyrus are so
> different.
> - Does mailsync care for it and places everything to the right
>  _new_version_ place? See downwards for a description.

Yes it should.

> I have not yet read the mailsync documentation carefully, because I am
> in a hurry and very limited with time. Testing is complicated because of
> limited bandwith and huge amount of data, so I'd like to ask you more
> questions:
>
> Assuming above answer of my question is yes:
> - If I use a complete backup of all data to migrate residing in a local
>  directory, can I use mailsync to sync /old-directory to the current
>  system regarding all mailboxes, shared folders and seen information
>  with one single command?

Not with a single command. You'll have to find out first how to access all 
the mailfolders. And then you'll have to at least transfer once for every 
user his inbox and then all the rest.

> - I want to test the result of mailsync with a not up-to-date snapshot
>  just to make shure that everything will be alright and step back
>  afterwards and use the current data if I trust it. I assume just
>  deleting the corresponding directories of cyrus ( /var/spool/cyrus,
>  /var/lib/cyrus) and restoring from a local backup of the situation
>  before would be sufficient, right? mailsync does not touch /etc or so,
>  does it?

I don't know what and how cyrus stores where. mailsync is only concerned 
with accessing a mailbox through whatever means available (in your case 
that would be through IMAP). So no, mailsync will not touch /etc.

> - Which directories of the old data must be in place if using from a
>  local directory?

None. You access them through IMAP.

> Let me list information about the folder structure of old and new cyrus:
>
> old:
> /var/spool/imap contains a lot shared folders, user and stage.
> /var/spool/imap/user contains folders with the mailusers name but no
> single letter directories - the mailusers name folders are the mailboxes
> /var/imap contains the working directory of cyrus, e.g mailboxes-db
>
> new:
> /var/spool/cyrus/mail contains directories from a-z and stage.
> At the single letter directories you find user/ and mailusers name
> folders therein, e.g.
> /var/spool/cyrus/mail/s/user/sascha - this is the testuser's mailbox
> /var/lib/cyrus is cyrus' working directory

This does not matter to mailsync, see above.

> ...if mailsync is not capable to do what I am expected to get ready -
> does anybody know a source of tools which can migrate the structure of
> cyrus v2.0.16 to v2.1.16?

Check /var/lib/dpkg/info/cyrus*.list. There was one a mail export/import 
tool and or read /usr/share/doc/cyrus*/*

*t

--
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   Tomas Pospisek
   http://sourcepole.com -  Linux & Open Source Solutions
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