Migrate maildir between servers dovecot

[Steffen Kaiser]

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On Thu, 18 Dec 2014, Davide Gmail wrote:

> Hi to all, i have two servers with dovecot 2.2.15 one is actualy on 
> production (server A) and another that i put on production soon (server B)
> My goal is migrate maildir from server A and server B.

if you can shut out all users and new deliveries between the hot phase of 
the migration, use rsync

rsync -aHAX --delete /path/to/base/on/old/server/ \
  new_server:/path/to/base/on/new/server

1) Run rsync before the hot migration to copy over most files,
2) shutdown Dovecot and mail delivery
3) run rsync another time (hot migration phase)
4) start Dovecot and mail delivery on new server
5) test migration with your own account(s)
6) enable access of all users
7) never allow users or mail delivery to the old server again

steps 2) and 3) prevent "duplicate messages" you read about on this list 
from time to time. Step 7) ensures, that both mail storages do not de-sync 
later.

- -- 
Steffen Kaiser
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