Dsync Dovecot Howto

Dovecot supports mastermaster replication using dsync. When executing a remote dsync program it works the same way.

High Availability Postfix Mail Server On Glusterfs 7layer

Mailboxes have 128 bit globally unique ids which are used for figuring out when two mailboxes should actually be synchronized.

Dsync dovecot howto. The entire configuration can be changed by giving c parameter to another configuration file or using o parameter to override specific settings. Discussion in ispconfig 3 priority support started by thaddeus aug 31 2016. Replicating emails between two mail servers by dovecot dsync if youre running mail server for large isp sometimes we may need to think of replicating your emails in two servers for redundancy this is very possible if your are running linux mail server with postfix dovecot and mysql and this is archived by using devocot dsync.

Dsync uses the same configuration files as the rest of dovecot via doveconf1 binary. Dsync can currently sync only one user at a time. It uses its own local configuration.

I have setup dovecot replication as per the instructions here https. Personally i have not used dsync yet. This describes the design for v20v21.

Its recommended that the same user always gets redirected to the same replica but no changes get lost even if the same user modifies mails simultaneously on both replicas some mails just might have to be redownloaded. It doesnt require any dovecot server processes to be running except when using u parameter to do a userdb lookup from auth process. If you want to dsync all users youll need to get a list of all users and execute dsync separately for each one.

You need dovecot v214 for this. Mysql master master replicatioon is working fine as well as unison forthe web files. Dsync attempts to preserve all changes done by both sides of the synced mailboxes.

Migrating from any imappop3 server to dovecot via dsync. The v22 design is somewhat different. This page describes how to migrate mails to dovecot from a remote imappop3 server preserving the imap uids pop3 uidls and everything else.

Dsync can be run completely standalone.

Object Storage Plugin Dovecot Documentation