----- dfw-apache@xxxxxxxxxxxxxxx wrote: > On Thu, Feb 03, 2011 at 11:00:25PM +0000, Igor Gali?? wrote: > > ----- dfw-apache@xxxxxxxxxxxxxxx wrote: > > > I've hit a vexing impasse with mod_proxy_balancer. > > > > > > I have a pool of backend boxes. They vhost many domains, so > > > need the specific Host: header in requests to them (the *same* > > > Host: header for all of them) > > > > > > I proxy requests to them potentially thousands of times a second, > > > > and their IP's are not going to be changing, so I name the > > > BalancerMembers by IP address, as the DNS lookup overhead is > > > a fatal waste of CPU, especially if your DNS servers melt > > > and your site dies unnecessarily. (No, /etc/hosts is not > possible. > > > > http://httpd.apache.org/docs/current/mod/mod_proxy.html#startup > > That only mentions ProxyBlock. We do not use ProxyBlock. Also, when > we > lost DNS, we lost the site, so reality has the last word regardless. duh. Sorry, must've been late yesternight, I didn't give it my full attention. > > > The sitename has multiple A records, and I make the backends > choose > > > individualiseable vhosts. Besides, my hosts file is vast!) > > > > > > Unfortunately, when I try and use mod_headers to set the Host: > header > > > for these backend connections, the balancer layer destroys the > > > result and replaces it with the IP. > > > > > > Apparently, if I switch ProxyPreserveHost on, I may get further, > > > but since that's a site-wide setting a side effect would mean all > > > > Not quite sure what you mean by site-wide, but: > > > http://httpd.apache.org/docs/current/mod/mod_proxy.html#proxypreservehost > > says: Context: server config, virtual host In trunk proxypreservehost can be put in *any* context. > > But ProxySet only allows you to set the same Variables as > > ProxyPass does. host is none of them. > > Indeed. This appears to be the problem. Such an option is missing. Right now I'm looking into 2.2's source to see how to add an option preservehost=(on|off). Can you please test: http://people.apache.org/~igalic/patches/mod_proxy-preserve_host.diff duh.. nodocumentationpatch! But I'm pretty sure you can guess how to use it ;) > DFW i -- Igor GaliÄ Tel: +43 (0) 664 886 22 883 Mail: i.galic@xxxxxxxxxxxxxx URL: http://brainsware.org/ --------------------------------------------------------------------- The official User-To-User support forum of the Apache HTTP Server Project. See <URL:http://httpd.apache.org/userslist.html> for more info. To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx " from the digest: users-digest-unsubscribe@xxxxxxxxxxxxxxxx For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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