What is the current state of High Availability Dovecot ?

[Steven Varco]

What do you mean bei „High Availability Dovecot“?
Dovecot HA using director and poolmon is working very well since quite some time now.
I recently just migrated a single instance dovecot to a HA setup using 2x Dovecot Director and 2x Dovecot IMAP servers.

Obviously High Availability setups are by nature more complicated then single host installations and there is also not „one in box“ solution, speaking you usually combine multiple components to build a HA setup.

For the basic infastructure you need four servers, two running dovecot director and two running dovecot IMAP.
To ensure IMAP requests are always going to one of the two directors you will probably want to use something like keepalived/CARP.

Since Dovexot 2.3 there is also a SMTP submission server included, before you will have to setup haproxy on the director/keepalived hosts additionally.

Last, for SMTP you can setup two SMTP Servers (usually postfix) on the IMAP hosts and control their access with the DNS MX records. No need to run special software as DNS/SMTP has high availabilty alrerdy included.

cheers,
Steven

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> Am 07.04.2022 um 21:45 schrieb White, Daniel E. (GSFC-770.0)[NICS] <daniel.e.white at nasa.gov>:
> 
> … without going to too much fuss ?
> 
> Searching the Internet produces a lot of old results and many overly complicated results.
> 
> My only complication is that I am using PostfixAdmin for mailbox management, and all the mailboxes are virtual.
> 
> Thanks.
>