Date: Wed, 25 Jul 2001 15:38:16 +0100 (IST) From: Sascha Lucky Luck <bofh@online.ie> To: Fabrizio Ravazzini <freefabri@yahoo.it> Cc: freebsd-isp@freebsd.org Subject: Re: FreeBSD Mail Toaster CLUSTER Message-ID: <996071896.3b5ed9d8b73cd@mail.online.ie> In-Reply-To: <20010725112323.20541.qmail@web20102.mail.yahoo.com> References: <20010725112323.20541.qmail@web20102.mail.yahoo.com>
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Quoting Fabrizio Ravazzini <freefabri@yahoo.it>: > Is it possible with FreeBSD to make a "cluster" of two > machines (ix86) that when one goes down for some fault > the other takes care of the service so that Mail is > still available? Fabrizio, set up 2 mail servers and CNAME <mail.foo.bar> to both servers in DNS. The 2 servers must access a file system (on a 3rd machine or a shared RAID system, or a Netapp filer) where the mails are stored. Be sure to use qmail with Maildir, otherwise you'll have file locking issues. DNS will assign a connection to <mail.foo.bar> to one or the other server using 'round robin'. If one server is down, an incoming connection will have a 50% chance of failure (the more servers, the more likely a successful connection becomes) but on retry it should connect. This setup has been successfully used with approx 100,000 users and 4 mail servers. Alternatively you can use a load balancer instead of DNS. It will notice a server down and reroute connections to the survivor. Good luck, s. ---------------------------------------------------- Get your free email account at http://www.online.ie/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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