Re: [squid-users] Squid3: vhost reverse proxy/accel bw extender

On Friday 08 August 2003 02.35, Jim Flowers wrote:
> Yes, by definition name-based hosts use the same ip number but have
> different host.domain.tlds. If I use only one cache_peer line, how
> do I configure more than one name-based virtual host on the server
> with that ip address?

It is all automatic unless you rewrite the host component of the
request via a redirector or forcing the domain in cache_peer...

Which domains to send to which origin server is controlled by
cache_peer_access.

A small example of a Squid-3 accelerator setup with one virtual host
based port 80, forwarding 4 domains to 2 different servers (2 domains
per server) with a default domain for old clients not supporting the
host header.

http_port 80 accel vhost defaultsite=www.example.com

cache_peer 192.0.2.54 parent 80 0 no-query originserver name=vhost1
acl vhosts1_domains dstdomain www.example.com partners.example.com
cache_peer_access vhost1 allow vhost1_domains
http_access allow vhost1_domains

cache_peer 192.0.2.60 parent 80 0 no-query originserver name=vhost2
acl vhosts2_domains dstdomain bugs.example.com support.example.com
cache_peer_access vhost2 allow vhost2_domains
http_access allow vhost2_domains

If the domains to pass to the origin web servers is different from
what the end-user requests in his web browser then the preferred
solution is to fix the origin servers to accept the official domains
requested by the end user. Alternatively you can use a redirector to
rewrite the URL while it is forwarded by Squid but this approach will
give you problems with most applications where the origin server will
sometimes try to redirect or send the end-user to the domain the
origin server thinks is the correct domain name for the server..

If you use the redirectror approach then the domains to use in
http_access will be the external domains, while cache_peer_access
uses the internal domains (after redirector rewriting of the URL).

Regards
Henrik

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