On 17 November 2011 14:02, Dennis Carr <dennistheti...@chez-vrolet.net> wrote: > I'm about to do a migration from one server to another - old server runs > Debian Lenny, new one runs Squeeze, both with respective current versions of > postfix. > > Long and short is that I'm basically preparing to migrate everything, > including users and a mailman configuration, to the new box. Basic strategy > I have is to shut down smtp on the old server during the course of the > migration, and once postfix is configured on the new box with the users and > mailman aliases, switch the old box over to being a secondary mx for a few > days while DNS settles down. > > Is there a better way to do this, or some sort of online guide I can follow > that can guide me through the process?
I'm pretty much the last person who's approach you should listen too, but this is how I did it. You don't say if the mbox/maildirs are also on the same server. If not, this could be easier for you. - Copy over the configuration and start the service - Optionally rsync any mailboxes/maildirs - Confirm delivery is working through the new system - Change over the DNS to point to the new box (MX 10) and the old one as backup (MX 20) - When mails start hitting the new one (probably around 2 hours depending on your DNS TTL, turn off the old one. - Optionally rsync (with a --delete option) any maildir/mailboxes for any mail that was delivered between the DNS switch and turning off the old server. Simon
