Terry Barnum wrote:
> After becoming frustrated with our current (non-postfix/dovecot)
mailserver's IMAP performance, I setup postfix+dovecot+mysql on a MacPro
running Snow Leopard (10.6.2) using MacPorts and an unused domain. After
getting it working and playing with it a bit I now have what is likely a
very-wet-behind-the-ears newbie question:
>
> When it's time to swap servers, is there a preferred recipe to move
to new hardware while using the same domain? I googled and checked the
FAQ and archives but didn't have a whole lot of luck.
>
> I think it would be something like:
>
> - configure new postfix/dovecot server to be in correct domain (conf
files, certificates)
> - setup users and passwords on new postfix/dovecot server
> - use imapsync to pull all email from old server to new
postfix/dovecot server
I think that there's an important step here that I always use when I'm
doing a mail migration. It could really go anywhere above the 'wait for
a Friday night' step, really. "Reduce the TTL on the domain to
something quite small, ie: 5 minutes." The point of this is that you'll
get an idea rather quickly of whether or not it works and, if it
doesn't, you'll be able to change it back without a portion of the users
experiencing long downtimes because of DNS records pointing to the wrong
server.
> - wait for a Friday night
> - swap DNS to point to new postfix/dovecot server
> - turn off smtp on the old server
> - use imapsync again to pull any new email from old server to new
postfix server
> - turn off old server
>
> Is this a reasonable approach?
>
> Thanks,
> -Terry
>
> Terry Barnum
> digital OutPost
> San Diego, CA
>
> http://www.dop.com
> 800/464-6434
>
>
--
Adrian Overbury
