Aha, I understood the points. I remember Dovecot team said they intend no longer maintain Director and plan to remove it in 2.4. it looks they went ahead with it. Well, then I hope you find a solution that fits in your stack but you might want to look at this as well. https://doc.dovecot.org/main/core/config/proxy/haproxy.html
Zak. On 2025-08-31 20:05, John Fawcett via dovecot wrote: > On 31/08/2025 20:04, Zakaria via dovecot wrote: >> Why can't you make HA out of Dovecot CE? Mounting disk using NAS to >> multiple servers and take it as a maildir storage, and have dovecot >> running in each with a POP loading balancing requests having HAProxy e.g. >> in frontend. Also using perhaps MySQL Cluster for virtual users and >> connect dovecot to it? >> >> This sounds to me from experience point of view very doable, and not sure >> why you think it isnt? No need for syncing data, since NAS will have data >> already synced and the bigger it gets the more disks you need to extend >> the RAID rack and you can build another server and rack as backup and >> write small script to take backup everyday and its sorted? >> >> Zak. >> >> On 2025-08-31 17:30, John Fawcett via dovecot wrote: >> > On 31/08/2025 17:02, Gerben Wierda via dovecot wrote: >> >> Will doveadm sync in a cron job give me something resembling HA? Don't >> >> think so. Replicator does. So, read my question not as 'syncing' is >> >> deprecated, but HA-syncing (via replicator) is. >> >> As far as I understand it, replicator sends the message immediately to >> the >> >> other side as it arrives. A, say, once every 15 minutes cron job >> running a >> >> new doveadm sync doesn't match that. >> >> So yes, syncing is not deprecated (I wrote that incorrectly). Doesn't >> >> change my situation as replicator is, and I want a true HA solution. >> >> G >> >> >> > Hi Zak > > I doubt that anyone has something like that working successfully. If they have, I'd be glad to hear of it. My reasoning is: > > 1) I would not assume that multiple Dovecot instances accessing and updating a common mail store is supported unless it is stated somewhere. My understanding is that you cannot just take a software that expects to handle a mail store being accessed only by itself and turn it into a multi instance unless the software supports that feature. > > 2) In the previous versions of Dovecot there was a specific architecture supporting multiple servers. Maybe it was there only for managing scaling, but I am assuming it also managed HA and that without it HA was not possible. > > 3) In the new version of Dovecot it has been stated that the features supporting multiple servers are available in Dovecot Pro and not in Dovecot CE. I recognize that this statement is not 100% correct since sync works across multiple servers, however not as HA. > > 4) I am not familiar with HAProxy, but my doubt about that is whether it would guarantee to have the same user always handled by the same Dovecot server, at least as a first approach to not having more than one Dovecot server accessing the same mailbox simultaneously. > > John > > _______________________________________________ > dovecot mailing list -- dovecot@dovecot.org > To unsubscribe send an email to dovecot-le...@dovecot.org
_______________________________________________ dovecot mailing list -- dovecot@dovecot.org To unsubscribe send an email to dovecot-le...@dovecot.org
