I would recommend using dsync migration to get rid of mbox format. We no longer develop that format, and bugs are limited to reading mbox format.
I would also recommend using master password / master user login with doveadm sync, and do the synchronization over imapc: to get the data safely migrated to your new system. You should use doveadm sync -u user backup -R imapc: on the new server to pull the data from old server. See https://wiki.dovecot.org/Migration/Dsync for more details. Aki > On 17/12/2020 11:08 Marc Roos <m.r...@f1-outsourcing.eu> wrote: > > > I would not choose centos 8 it has EOL < than centos7. IBM is pulling > the plug on the centos distribution, and makes it more or less a beta > for the rhel. Thus centos7 and then you have a few years to decide what > to choose. Enough to go to full containerized eg. ;) > > You do not need to rsync, dovecot can sync messages. I am just in the > process of migrating a server from a different network to a different > mailbox format. > > My approach was to create an 'archive' namespace on shared slower but > distributed storage so I do not have to move to much data. > > > > -----Original Message----- > From: Barbara M. [mailto:barb...@rfx.it] > Sent: 17 December 2020 01:47 > To: dovecot@dovecot.org > Subject: migration from 2.0.16 > > > I have an old server with CentOS 6.x and dovecot 2.0.16 (postfix-2.6.6 > and roundcube), that was an update from a 1.x many years ago ... > Users in /etc/passwd > Mailbox format mbox > some filtering via procmail > About 5.000 users, 1 TB data (/var/mail + /home/users) > > Obviously I am searching for a smooth upgrade path (with no or minimal > downtime and users problems) ;-) > > Until few days ago my idea was a CentOS 8.x new box with the standard > default packages (dovecot-2.3.8, postfix-3.3, ...). > Now this can be reconsidered. I suppose there will be a RockyLinux or > something equivalent but if there is a good reason I can consider Debian > or other OS if they have a decent EOL or some advantages. > > Anyway, the more relevant problem at the moment is collect info for the > best approch to have a smooth dovecot upgrade. > > My dream is the possibility to configure a new server and rsync the data > (/var/mail + /home/users), and, when the tests are satisfiable do the > final sync and swap the IP, but I suppose deleting the .imap folders > isn't a simple complete solution to compatibility problems. > > Any hints, links, experiences are appreciated. > > Thanks, B.
