Dovecot Director: Preferred backend server

[William Edwards]

Haven’t looked at this use case, so I’m unsure if there’s existing functionality to achieve this. If not: you could set the default vhost count of the failover server to 0, and up it once some health check sets the primary server to down.

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> Op 30 aug. 2021 om 18:11 heeft Steven Varco <dovecot.org at bbs.varco.ch> het volgende geschreven:
> 
> Hi All
> 
> I have a dovecot cluster with directror and two IMAP Servers behind.
> 
> Since they are in geographical different locations I would like to have users to go to a specific IMAP backend server (if both are up) and only switch to the other if one goes down (failover).
> 
> As to my current knowledge the PassDB extra field „host=„ is not suitable in this case as it would never route the client to a different backend, even if the „user specific backend“ would be down.
> 
> Is their a way in dovecot to achive this? As far as I searched the documentation I could not find any information on this so far.
> 
> If not, it may also help if I could get certain users to „initially" go to a specific backend (since director usually routes a client/user to the same backend server it initially connects) and therefore it would be interesting to know how dovecot director chooses wether a user goes to server1 or server2?
> And if a client already gets to server2, how to bring it „back“ to server1?
> 
> thanks in advance,
> Steven
> 
> -- 
> https://steven.varco.ch/ 
> https://www.tech-island.com/ 
> 
>