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Date:      06 Jul 2000 14:01:51 -0400
From:      Chris Shenton <cshenton@uucom.com>
To:        Luigi Rizzo <luigi@info.iet.unipi.it>
Cc:        Alan Batie <batie@rdrop.com>, isp@FreeBSD.ORG
Subject:   Re: load balancing
Message-ID:  <lf1z17yw6o.fsf@Samizdat.uucom.com>
In-Reply-To: Luigi Rizzo's message of "Thu, 6 Jul 2000 18:41:46 %2B0200 (CEST)"
References:  <200007061641.SAA85813@info.iet.unipi.it>

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On Thu, 6 Jul 2000 18:41:46 +0200 (CEST), Luigi Rizzo <luigi@info.iet.unipi.it> said:

Luigi> I have some plans to implement a load balancer a-la Cisco
Luigi> LocalDirector for FreeBSD, but this requires one machine to sit
Luigi> between clients and servers.

Problem with having a single machine as the balancer is that you
inject a single point of failure.  IMHO the balancer must support some
kind of failover to a twin balancer box, or better, share load between
the two balancers if they're both up.

DJB's djbdns (aka "dnscache" suite) claims to do something like this
with DNS but I don't believe it checks server health at the
application layer, which IMHO it must if it's to be used as for fault
tolerance at minimum, balancing at best.


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