On 29.5.2012, at 20.17, Ron Leach wrote: > On 29/05/2012 16:55, Timo Sirainen wrote: >> On Tue, 2012-05-29 at 15:09 +0100, William Gallafent wrote: > >>> I would now like to add a webmail front-end (squirrelmail) running on >>> the same server. In order to achieve this I would like to have >>> squirrelmail connecting locally using IMAP, but without the >>> certificate requirement. > >>> Do I need to run two separate dovecot instances in order to achieve >>> this, or can I somehow configure different SSL requirements for the >>> two ports? > >> for now you'd need to run two Dovecot instances. >> > > [Keen to do the same thing.] I guess those two Dovecot instances could run > either on (a) the same machine, or (b) different machines - though using a > network-visible mail storage location.
Yes. > Does this dual-Dovecot solution become problematic if the mail storage > location is NFS? I'm aware of the cautions regarding NFS access from two > different machines (case (b), here). Yes, NFS will cause trouble in that kind of a setup. > If these two Dovecot instances were on the same machine (case (a)) but which > nevertheless used an NFS mail storage location, would we then also hit the > NFS dual-access problem from this single machine running the two instances? If there is a single NFS mountpoint used by both Dovecots, there won't be a problem since there is only one kernel accessing and caching it. (I'm not entirely sure if there's a problem with more than one mountpoint, might be.) Dovecot itself doesn't internally have a problem with multiple Dovecot instances accessing the same files, regardless of where they are stored.
