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 reqeusts 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. 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 of my other proxied directories would now get the wrong Host: header. All the RewriteRule [P]'s would break and I would have to catch and replace the Host in every single one of them in individual <Proxy> blocks. That deluge of perpetual kludgery does not appeal. What I need is a way to tell a ProxyPass or BalancerMember, that they should use a certain Host: header in its communications with this backend. e.g. BalancerMember http://10.0.0.1/foo/ host=foobar.com The logical alternative would have been to be able to specify a certain target IP to connect to instead of a certain Host name to use e.g. BalancerMember http://foobar.com/foo/ address=10.0.0.1 but I suspect apache would then be unable to set <Proxy> block rules for individual balancer members since they'd all declare the same URL and you'd be unable to match them individually So, I currently can't use my backends in mod_proxy_balancer Does anyone have any suggestions? DFW --------------------------------------------------------------------- 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-unsubscr...@httpd.apache.org " from the digest: users-digest-unsubscr...@httpd.apache.org For additional commands, e-mail: users-h...@httpd.apache.org
