Date: 11 Aug 1999 09:48:39 -0400 From: Chris Shenton <cshenton@uucom.com> To: Barrett Richardson <barrett@phoenix.aye.net> Cc: Steve Hovey <shovey@buffnet.net>, Mitch Vincent <cygone@zoomnet.net>, freebsd-isp@FreeBSD.ORG Subject: Re: Loadbalance webservers Message-ID: <lfd7wul96w.fsf@Samizdat.uucom.com> In-Reply-To: Barrett Richardson's message of "Tue, 3 Aug 1999 09:57:31 -0400 (EDT)" References: <Pine.BSF.4.01.9908030955260.2994-100000@phoenix.aye.net>
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Barrett wrote:
You can just have multiple address records
www IN A x.x.x.3
IN A x.x.x.4
.
.
.
IN A x.x.x.n
Found some solid info on ISC's BIND documentation about trying to do
load balancing with DNS. The "SRV" record is designed for this but I
haven't found software that uses it (tho BIND8 implements it). So the
multiple records are a bit of a hack and will hose you if one of the
servers dies.
There's a pointer to "lbnamed" from Stanford which looks worth
trying. It puts a little load-monitor daemon on each server which the
balancing named queries; presumably it hands out records for the
least-loaded server and won't hand out records for servers that don't
respond.
It would be way cool to modify the server-based daemon to have it
determine the network distance/cost to the *client* then feed that to
the lbnamed so it could return a record corresponding to the server
fastest/closest to the actual client. This would implement WAN load
balancing much like F5 Lab's $27K (each) 3DNS.
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