Am 20.07.2015 um 20:04 schrieb Laz C. Peterson: > I’m trying to do this too. But the goal would be simply for automatic > failover to the other datacenter. Everything is working if the server’s > unique hostname is entered, but I want to do something like round robin DNS > that mail clients will automatically attempt to connect to the other IP if > they cannot get to the first address. Unfortunately mail applications don’t > really do this like web browsers do …
think about using loadbalancers before directors/proxies with checks, i dont think you will goal with round robin dns etc for real world setups > > ~ Laz Peterson > Paravis, LLC > >> On Jul 20, 2015, at 10:29 AM, Chad M Stewart <c...@balius.com> wrote: >> >> >> I'm trying to determine which dovecot components to use and how to order >> them in the network path from client to mail store. >> >> >> If I have say 1,000 users, all stored in MySQL (or LDAP) and have 4 mail >> stores, configured into 2, 2 node pods. >> >> >> MS1 and MS2 are pod1 and are configured with replication (dsync) and host >> users 0-500. MS3 and MS4 are pod2 and are configured with replication >> between them and host users 501-1000. Ideally the active connections in >> pod1 would be split 50/50 between MS1 and MS2. When maintenance is >> performed obviously all active connections/users would be moved to the other >> node in the pod and then rebalanced once maintenance is completed. >> >> I'm not sure if I need to use both the proxy and director, or just one or >> the other? If both then what is the proper path, from a network perspective? >> I like the functionality director provides, being able to add/remove >> servers on the fly and adjust connections, etc.. But from what I've read >> director needs to know about all mail servers. The problem is that not all >> servers host all users. User100 could be serviced by ms1 or ms2, but not by >> ms3 or ms4. >> >> I'm trying to design a system that should provide as close to 99.999% >> service availability as possible. >> >> >> >> Thank you, >> Chad Best Regards MfG Robert Schetterer -- [*] sys4 AG http://sys4.de, +49 (89) 30 90 46 64 Franziskanerstraße 15, 81669 München Sitz der Gesellschaft: München, Amtsgericht München: HRB 199263 Vorstand: Patrick Ben Koetter, Marc Schiffbauer Aufsichtsratsvorsitzender: Florian Kirstein
