Matt Dickinson wrote:
Hi,
I've currently got 2 servers running a "conventional" postfix/uw-imapd
solution, and I've been looking to replace this with a more reliable system
in the event of a machine failing.
Having come across dbmail today, I'm impressed so far :-)
But just a quick question..
I plan to have one of the servers acting as the master, and the other a
slave.. Doing backup MX and having the mysql database replicated to it. In
the event of the master failing, I was planning on just switching the DNS so
it would be transparent to users.
Why not run heartbeat and do an IP takeover ? Switching DNS is far from
transparent to users, even with very low ttl values.
Are there preferred methods for running something like this in a 2 server
configuration? Is it possible to use a different host for the smtp process
when adding new mail to the database, and a different host for pop3/imap
services?
Sure. Why not. Run a heartbeat-cluster with IP fallover for a mysql
cluster. Use as many different machines as you like, or the same two
machines for that matter, as pop/imap/smtp frontends, all pointing to
the mysql master for their storage backend.
There is no need to run a database on the machine that has dbmail installed.
Thanks in advance,
Matt
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