Date: 27 Jul 2001 17:16:21 +0930 From: Andrew Reid <andrew.reid@plug.cx> To: so@server.i-clue.de Cc: Fabrizio Ravazzini <freefabri@yahoo.it>, freebsd-isp@FreeBSD.ORG Subject: Re: FreeBSD Mail Toaster CLUSTER Message-ID: <996207686.1405.14.camel@percible.alfred.cx> In-Reply-To: <3B5FDE77.DC5FC3DB@i-clue.de> References: <20010726065304.39908.qmail@web20106.mail.yahoo.com> <3B5FDE77.DC5FC3DB@i-clue.de>
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On 26 Jul 2001 11:10:15 +0200, Christoph Sold wrote:
> As DNS & bind tells, just have two mail servers accept SMTP for your
> domain. Assign different names and A records, as well as set both as MX
> for your domain.
>
> If one goes down, the other will get the mail automatically.
I've been thinking about putting in another mailserver for redundancy.
The notion of setting up a secondary MX host is easy enough, but it
doesn't seem to be enough for what I'd like to do.
For example:
+-----------------------+ +---------+
| |---------------->| MX1 |
| Load Balancing Device | +---------+
| | +---------+
| |---------------->| MX2 |
+-----------------------+ +---------+
If the Load Balancing Device ("LBD") is sharing out connections for
ports 25 and 110 between MX1 and MX2, I want to be sure that if one of
the two machines goes down, everyone can still get their mail.
I've looked at some methods of doing this where, when accounts are
created, they are equally dispersed amongst your MX farm, but that means
that all users on the dead MX will have no mail access.
How are people going about delivering distributed, redundant,
load-balanced mail? I was thinking that some form of parallel delivery
could be implemented, but that would result in the load of MX1 and MX2
being pretty similar (one would think).
You don't want to have all your eggs in one basket, but at the same
time, you do. You want to be able to get to your mail -all- the time,
not just when the appropriate server is up. If accounts "joe", "thelma"
and "louise" are on MX1, they still need to be able to get to their
mail, even when the server is down.
Hmm! Suggestions?
- andrew
--
void signature () {
cout << "Andrew Reid -- andrew.reid@plug.cx" << endl ;
cout << "Cell: +61 401 946 813" << endl;
cout << "Quidquid latine dictum sit, altum viditur" << endl;
}
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