On 28/11/2011 23:14, Marcelo Salhab Brogliato wrote:
Hi, I'm new to this list and want your help. I'm the mail admin for some domains in Rio de Janeiro - Brazil. Today we have only one machine running dovecot (imap+pop3) with local mail. We are migrating to two virtual machines in kvm running in separate hosts. Then we have two main problems:
- How to share mail files to both dovecots? We've been thinking about NFS using local indexes. Is this a good approach?
- How do we have a fault tolerant mail servers? Our first solutions is using two IP addresses in our DNS records.
For imap i need only 1 VIP both for loadbalancing or HA, for SMTP u can use dns failover with multiple mx records.
About NFS using local indexes, I'm configuring a test server. But how to configure local indexes when my mail_location comes from sql (userdb_home actually). I'm using dovecot 1.2.9. I suggest to not use local indexing (for high i/o after failover) , anyway NFS for HA setup works well!
If u need a cluster (master/master) consider having an HA loadbancer (dovecot director):
-- Simone Caruso IT Consultant +39 349 65 90 805