RE: [squid-users] Accelerator and DNS conflicts

Hi Alan,
        All you need to do is use a redirector program, there are some links to
various ones on the squid web site
(http://www.squid-cache.org/related-software.html).

Make sure you have the following set in your squid.conf:-

httpd_accel_host virtual
httpd_accel_port 80
httpd_accel_uses_host_header on

Then make the redirector translate the FQDN that is in the host header into
whatever address you want.

We have a similar thing setup to front-end a load of Windows 2000 web
servers with Squid. When someone goes to www.xaraonline.com/foo/ it in fact
gets changed into an internal URL which is quite different :-)

This can be used to great effect, for example you can get the redirector to
translate the fqdn to an internal DNS setting which maps to multiple
servers. This way squid will load balance across the available servers when
passing requests to the backend servers as well as coping with all but one
of the backend servers falling over!.

--
Simon Morley (simon@xaraonline.com)
Network Manager for Xara Online (http://www.xaraonline.com/)
"Thou shalt not follow the Null Pointer, for at it's end Madness and Chaos
lie."
> -----Original Message-----
> From: alanl@hyperlink-interactive.co.uk
> [mailto:alanl@hyperlink-interactive.co.uk]
> Sent: 11 May 2001 16:13
> To: squid-users@squid-cache.org
> Subject: [squid-users] Accelerator and DNS conflicts
>
>
> This is my first post, and I've done a fair bit of looking at how DNS
> and squid work together in accelerator mode.
>
> We have a squid web proxy (A) which needs to accelerate an apache
> virtual server running on machine (B).  By the miracle of DNS everyone
> in the world thinks machine A is the web site, but this includes A
> itself.  I want machine A(running squid) to think B is the web site for
> content, and thus pass all headers intact, especially HTTP/1.1 Host:
> headers (remember Apache Virtual Server) onto machine B.
>
> Unfortunately if it does a DNS lookup it comes back with itself, and
> refuses to work!
>
> Is there a way of getting round this?  I cannot change machine B config
> without much difficulty, but I can do pretty much what I want with
> machine A, which is running RH6.2 - Squid 2.3.STABLE1.
>
> Hopefully someone has seen this before...
>
> Many thanks
>
> Alan
> --
> Alan Lapthorn              t: +44 20 7240 8121
> Systems Administrator      f: +44 20 7240 8098
> Hyperlink Interactive Ltd. e: alanl@hyperlink-interactive.co.uk
> 8 Upper St Martins Lane, Covent Garden, London WC2 9DL
>