Respectfully, I would like to ask: please do not remove replication, please rethink this.
Currently, replication is my life saver. I run two postfix/dovecot combos (on different operating systems), with dovecot synchronising via replication. Both are behind a HAProxy running on the router (OPNsense), one as active, one as backup.
If one of the two fails, the other takes over, and when it comes up again everything works fine and is up to date. I have had these kinds of system failures (very hard to find and turned to be hardware related) and it was the replication that made me survive the issues (even when I was far away from my systems). Mail for my small group of users (about 8) never went down, no mail message was ever lost, no manual interventions to sync were ever needed.
If I want to create the same level of availability without replication, I need those two dovecots to use shared (NFS cluster) storage. But then, I have another single point of failure (NFS storage) again. So, I need two separate NFS machines that synchronise, Apart from the nightmare of making NFS secure, it means that I need to double my hardware (from two systems to four) to be protected against hardware failure (which is my goal).
The replication service is the perfect small scale solution. Together with HAProxy, it enables HA in the most simple and effective way. Going the 'NFS cluster' route is not feasible for me, so if replication is removed and I am forced to upgrade, I will lose HA.
So please, take small scale users like me into account.
Gerben Wierda (LinkedIn https://www.linkedin.com/in/gerbenwierda, Mastodon https://newsie.social/@gctwnl) R&A IT Strategy https://ea.rna.nl/ (main site) Book: Chess and the Art of Enterprise Architecture https://ea.rna.nl/the-book/ Book: Mastering ArchiMate https://ea.rna.nl/the-book-edition-iii/ YouTube Channel http://www.youtube.com/@GerbenWierda
On 16 Jul 2023, at 18:54, Aki Tuomi via dovecot dovecot@dovecot.org wrote:
Hi!
Yes, director and replicator are removed, and won't be available for pro users either.
For NFS setups (or similar shared setups), we have documented a way to use Lua to run a director-like setup, see
https://doc.dovecot.org/3.0/configuration_manual/howto/director_with_lua/
Regards to replication, doveadm sync is not being removed. So you can still run doveadm sync on your system to have a primary / backup setup.
Aki
On 16/07/2023 18:34 EEST William Edwards via dovecot dovecot@dovecot.org wrote:
Top posting because nothing specific to reply to, sorry. Not exactly sure, but there’s another thread about the removal of Director in favour of Dovecot Pro on 3.x. Perhaps this change is related.
William Edwards
Op 16 jul. 2023 om 16:33 heeft Daniele danix@kernel-panic.it het volgende geschreven:
Hello,
Just like Vladimir, I'm a bit concerned about this change, and I'd really appreciate if someone could let us know if the replication feature (that works so well!) will be replaced or removed; and, in case of removal, what would be recommended replacement? Thanks in advance and best regards, Daniele
On 09-Jul-23 9:36 PM, Vladimir Mishonov via dovecot wrote: Hello everyone.
Just saw this commit in the official Github repo:
https://github.com/dovecot/core/commit/4c04e4c30fd4817a8b0e11d04d9681173f696...
Looking at the commit details, it appears that it completely removes the replication feature. I'm a bit perplexed by this change and am not sure what might be the justification for it. Personally, I find replication to be very useful, as it allows me to maintain a synchronized mirror of all of my mailboxes on my home server, for use as backup in case the primary server goes down for some reason.
Perhaps there's some sort of replacement being planned for this feature? Or maybe the relevant code is simply going to be refactored to a plugin or external program, and there's nothing to worry about at all?
In any case, I'd greatly appreciate if one of the developers could comment on this change.
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Respectfully, I would like to ask: please do not remove replication, please rethink this.
Currently, replication is my life saver. I run two postfix/dovecot combos (on different operating systems), with dovecot synchronising via replication. Both are behind a HAProxy running on the router (OPNsense), one as active, one as backup.
If one of the two fails, the other takes over, and when it comes up again everything works fine and is up to date. I have had these kinds of system failures (very hard to find and turned to be hardware related) and it was the replication that made me survive the issues (even when I was far away from my systems). Mail for my small group of users (about 8) never went down, no mail message was ever lost, no manual interventions to sync were ever needed.
If I want to create the same level of availability without replication, I need those two dovecots to use shared (NFS cluster) storage. But then, I have another single point of failure (NFS storage) again. So, I need two separate NFS machines that synchronise, Apart from the nightmare of making NFS secure, it means that I need to double my hardware (from two systems to four) to be protected against hardware failure (which is my goal).
The replication service is the perfect small scale solution. Together with HAProxy, it enables HA in the most simple and effective way. Going the 'NFS cluster' route is not feasible for me, so if replication is removed and I am forced to upgrade, I will lose HA.
So please, take small scale users like me into account.
Gerben Wierda (LinkedIn, Mastodon) R&A_IT_Strategy (main site) Book: Chess_and_the_Art_of_Enterprise Architecture Book: Mastering_ArchiMate YouTube_Channel
On 16 Jul 2023, at 18:54, Aki Tuomi via dovecot <dovecot@dovecot.org>
wrote:
Hi!
Yes, director and replicator are removed, and won't be available for
pro users either.
For NFS setups (or similar shared setups), we have documented a way
to use Lua to run a director-like setup, see
https://doc.dovecot.org/3.0/configuration_manual/howto/
director_with_lua/
Regards to replication, doveadm sync is not being removed. So you can
still run doveadm sync on your system to have a primary / backup
setup.
Aki
On 16/07/2023 18:34 EEST William Edwards via dovecot
<dovecot@dovecot.org> wrote:
Top posting because nothing specific to reply to, sorry.
Not exactly sure, but there’s another thread about the
removal of Director in favour of Dovecot Pro on 3.x.
Perhaps this change is related.
William Edwards
Op 16 jul. 2023 om 16:33 heeft Daniele
<danix@kernel-panic.it> het volgende geschreven:
Hello,
Just like Vladimir, I'm a bit concerned about
this change, and I'd really appreciate if someone
could let us know if the replication feature
(that works so well!) will be replaced or
removed; and, in case of removal, what would be
recommended replacement?
Thanks in advance and best regards,
Daniele
On 09-Jul-23 9:36 PM, Vladimir Mishonov
via dovecot wrote:
Hello everyone.
Just saw this commit in the official
Github repo:
https://github.com/dovecot/core/commit/
4c04e4c30fd4817a8b0e11d04d9681173f696f41#diff-
5f643d8b0d1eea65d0f3c749d14d42b25a9d60f0f149bface862f5ff348412c8
Looking at the commit details, it
appears that it completely removes the
replication feature. I'm a bit
perplexed by this change and am not
sure what might be the justification
for it. Personally, I find replication
to be very useful, as it allows me to
maintain a synchronized mirror of all
of my mailboxes on my home server, for
use as backup in case the primary
server goes down for some reason.
Perhaps there's some sort of
replacement being planned for this
feature? Or maybe the relevant code is
simply going to be refactored to a
plugin or external program, and there's
nothing to worry about at all?
In any case, I'd greatly appreciate if
one of the developers could comment on
this change.
_______________________________________________
dovecot mailing list -- dovecot@dovecot.org
To unsubscribe send an email to dovecot-
leave@dovecot.org
_______________________________________________
dovecot mailing list -- dovecot@dovecot.org
To unsubscribe send an email to dovecot-leave@dovecot.org
_______________________________________________
dovecot mailing list -- dovecot@dovecot.org
To unsubscribe send an email to dovecot-leave@dovecot.org