That's a nice suggestion. Thanks John. On Fri, Jul 12, 2024 at 11:25 PM John Fawcett via dovecot <dovecot@dovecot.org> wrote: > > > On 12/07/2024 13:05, Jeff Pang via dovecot wrote: > > Hello, > > > > Does the community version of dovecot have the replication feature? > > When one dovecot was down, another one could take over the tasks. > > > > Thanks. > > > > _________________________________________________________________ > > Jeff > > Replication is in the current dovecot version but will go away in 2.4. > > The doveadm sync feature is staying. So with some work you can set it up > what you are requesting. > > I used to use replication and now I'm thinking about using sync but have > not implemented it. The following are thoughs on it. > > There are some points to be addressed that are outside dovecot. I think > you'd have to make sure that your sync happened frequently enough that > you could live with losing the emails that arrives bewteen syncs for > example. That would tend to lead to a requirement to sync more > frequently and reduce risk of email loss. But then you'd need to avoid > more than one sync being active simultaneously (that is my assumption > that this would not work, but I don't know if it is a real problem). > > The failover would require you to stop people accessing the old server, > stop syncing and start the backup instance. When the main instance is > available to come back on line, you'd need to stop the backup instance, > sync in the opposite direction and then start dovecot and re-enable the > sync mechansim towards the backup. > > You need to ensure people don't connect simultaneously to both > instances. So some thought would be needed about those cases where the > main node goes and then comes backup to ensure that your sync is not > still active at that point and replicates the old state onto the backup > server and to ensure then people don't start connecting to it again > without being able to control it. > > It's a disaster recover rather than high availability solution, but I > think it can work. Others may already have got working implementations > and thought through some of the implications. > > John > > > _______________________________________________ > dovecot mailing list -- dovecot@dovecot.org > To unsubscribe send an email to dovecot-le...@dovecot.org > >
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