One approach could be to setup a load balancer (lvs, haproxy) in front of the servers to share the IMAP load. Make also the sessions persistent to avoid issues with authentication.
Alex On February 9, 2017 11:57:09 AM GMT+02:00, Patrick Chemla <patrick.che...@perfaction.net> wrote: >Thanks all for your answers. > >I have at last setup the NAS, and mails are received there. > >So I will set the second server and second MTA, and both will receive >emails. > >Next step is to give users access to both servers to retreive emails. > >As a load-balancer could help easily for http/https access, how to deal > >with IMAP ports? How to load-balance IMAP ports? > >Thanks >Patrick > >Le 29/01/2017 à 14:29, rightkicktech.gmail.com a écrit : >> A shared storage with glusterfs seems a nice approach. >> In this way, it doesn't matter which server receives the mail, as >long >> as the MDAs of each server write on the shared storage. >> >> Alex >> >> On January 25, 2017 6:08:59 PM EET, Patrick Domack >> <patric...@patrickdk.com> wrote: >> >> All options, assuming your imap/pop/lmtp are compatable and >friendly using it. >> >> I know dovecot you should only access a mailstore from one host >at a >> time, don't just randomly balance things, or it can corrupt the >index >> files. >> >> Quoting Eero Volotinen <eero.voloti...@iki.fi>: >> >> how about mounting ceph or glusterfs disk to message store? >> eero 25.1.2017 5.18 ap. "Patrick Domack" >> <patric...@patrickdk.com> kirjoitti: >> >> This would not be a good thing to do, as deleted email >> will magically reappear. Using unison to sync it worked >> for me, over 10years ago. But these days, just use dsync >> part of dovecot, and your life will be happy. Quoting >> Patrick Chemla <patrick.che...@perfaction.net>: Hi >Wietse, >> >> Of course I thought about such NAS solution, but I >> wanted to check if there is a way with 2 separate >> disks, with a kind of that could be aware of emails >> files changes. Actually, the mail server run onto a >> VM, on a big server. I have another big server with >> same emails VM, and I just rsync --delete --update >> from the first one to the second. So I have a full >> image copy every 5 minutes, but only one real MTA. I >> will check the NAS option, if there is no other way. >> Thanks Patrick Le 24/01/2017 à 13:45, Wietse Venema a >> écrit : >> >> Patrick Chemla: >> >> Hi, I have a running Fedora 24 emails server >> using postfix 3.1.3, with courier. I wonder >> how to build a pair of MTAs to secure emails >> at all time, having 2 servers receiving the >> emails, and users could connect to either >> server to get emails, maybe on a load >balanced >> way. Problems are with synchronization when >> receiving emails from outside, or emails >read, >> emails moved,.... >> >> You need a redundant message store. In pre-cloud >> times, people would use a NAS filer with >redundant >> disks, store email as maildir files (one per >> message) and MDAs would mount that store via NFS. >> Perhaps that model still works for you. Does >> someone have a good guide, howto, doc to achieve >> this? >> >> Thanks for help. Patrick >> >> >> >> >> >> -- >> Sent from my Android device with K-9 Mail. Please excuse my brevity. -- Sent from my Android device with K-9 Mail. Please excuse my brevity.
