A frind of mine and I are running a dedicated server, that among other things host mail for ourselves and friends and families. All in all about 15 different domains with 35-40 users. The machine in question is old, so we are doing a slow transition from the old server to the new one. So far, we've managed to move web hosts seamlessly. Due to the technical capabilities at some of the user base, it would be nice to get to a setup, where we can move individual users imaps from the old server to the new one, as we get the time to visit them.
I have an idea how such a transition could go:
Upgrade the old dovecot 1.2.15 to 2.1.whateveritis from debian squeeze backports.
Set dsync up to replicate mails from the old server to the new server. I know that 2.2 is recommended, but with a limited amount of user, I'm willing to take a performance hit.
Migrate my parents &c to use the new server.
When all users have been moved on to using the new server, upgrade MX records for the domain to point at the new server.
When all MX records are updated, decalre success.
Is this feasible, and what would the risks be. For instance, during step 4, mails are bound to arrive at bothe the old and new server for some time. Will this cause problems?
Is there a simpler solution to the problem?
-- /Wegge
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