Date: Sat, 31 Jan 2009 13:55:08 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: "Marc G. Fournier" <scrappy@hub.org> Cc: freebsd-questions@freebsd.org Subject: Re: Load balancing multiple virtual hosts on 1 IP Message-ID: <4984583C.2030409@infracaninophile.co.uk> In-Reply-To: <20090131091825.R90262@hub.org> References: <20090131091825.R90262@hub.org>
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[-- Attachment #1 --] Marc G. Fournier wrote: > > Simple: is it possible? > > I have two VMs that contain the same content, on two different IPs .. I > want to setup a third VM with something like haproxy on it that will > take the URL (http://domain1) and pull the content from one or the other > ... > > So far, all works well if I only have one virtual host, but as soon as I > add a second one (http://domain2), when I try to go to http://domain2, > it pulls up the content for domain1 also, as if I was going to http://IP > instead. > > Is there a way to set this up (with haproxy, or some other software), > that it will actually pass the URL through to the backend apache server > and load up the right content? Or is this a limitation in the protocol > itself?/ This is certainly possible -- most of the world's big web sites work in exactly this way, although they would tend to use dedicated hardware LB if they were of any appreciable size. I think what's going wrong for you is that you are using a front-end proxy, and it's rewriting the requests with the host names of the real servers, which will certainly screw up name based virtual hosts. Instead of ha-proxy, look into relayd -- in conjunction with a pf(4) firewall this will do exactly what you want. It can operate purely at the IP level or even at layer 2 if you want to implement DSR. Another alternative to consider is varnish, although I'm not sure that has much in the way of health-checking the back-end servers behind it. varnish is a reverse-proxy / web accelerator so can give you some performance boost as well. Cheers, Matthew -- Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.10 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEAREIAAYFAkmEWEIACgkQ8Mjk52CukIwdwgCaA1VU1lH/4n0N6O+hG1sXrj7D dt8An0zHgiH2bCI4es07CGKLmvXnkKK9 =7HS/ -----END PGP SIGNATURE-----help
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