Hi, Dovecot Director is used to keep a temporary user -> Dovecot backend server mapping. So, Director decides which backend handles each user and the user is always redirected to the same server. All user data is stored in shared storage (NFS). The Dovecot presentation featured during this webinar <http://knowledgebase.open-xchange.com/fileadmin/user_upload/open-xchange/misc/webinar/2013_21_08/Dovecot_Webinar_21.08.2013.pdf> mentions (slide 7) a Dovecot proxy cluster (doing credentials and user info lookup) behind the LB device (F5 Big-IP) Why Dovecot Director server isn't used to perform this without Dovecot proxy ? Thus, the load balancer (F5 Big-IP) can distribute requests based on IMAP protocol to Dovecot Director cluster. Thx so much. gdrub
Il 01/12/2014 17:11, rub zorghy ha scritto:> Why Dovecot Director server isn't used to perform this without Dovecot > proxy ? Thus, the load balancer (F5 Big-IP) can distribute requests based > on IMAP protocol to Dovecot Director cluster.I think that the slide is just one example of a scenario ,very complex. In real world, unless you do not have to segment users (some users use Exchange, others use Dovecot, but all user use imap.corporate.com, the proxy, for login) you don't need a Proxy in front of Director. Load balancer is only for HA. Ciao
Hi Alessio, Thank you very much for your detailed explanation. gdrub 2014-12-01 18:28 GMT+01:00 Alessio Cecchi <alessio at skye.it>:> > Il 01/12/2014 17:11, rub zorghy ha scritto: > >> Why Dovecot Director server isn't used to perform this without Dovecot >> proxy ? Thus, the load balancer (F5 Big-IP) can distribute requests based >> on IMAP protocol to Dovecot Director cluster. >> > I think that the slide is just one example of a scenario ,very complex. In > real world, > unless you do not have to segment users (some users use Exchange, others > use Dovecot, but all user use imap.corporate.com, the proxy, for login) > you don't need a Proxy in front of Director. > > Load balancer is only for HA. > > Ciao >