Maybe this should be a admin-configurable solution. Something like: Apache proxy checks backend server port 4711 and expects load data in a defined format. And we can configure, how often apache checks this backend server (maybe just every 10 seconds and not with every request...).
And everyone can write its own load-detection script to deliver this data on port 4711 ? (in my opinion, we should separate application and application server from infrastructure questions. And the load detection is an infrastructure question). Uli Von: Daniel Ruggeri [mailto:drugg...@primary.net] Gesendet: Donnerstag, 20. November 2014 14:50 An: users@httpd.apache.org; Jim Jagielski Betreff: Re: [users@httpd] Load balancing with load detection on backend servers ? The guts are all there for this to work on the proxy side. We just need to make a module out of it. The question of header name and what-not can be solved by making it configurable. The real $1,000,000 question is what your backend is and how you can gather load information. This would be trivial to do with a Servlet filter in a J2EE app, but I am not sure about other implementations (my own ignorance rather than it being technically impossible). -- Daniel Ruggeri ________________________________ From: Jim Jagielski <j...@jagunet.com<mailto:j...@jagunet.com>> Sent: November 20, 2014 7:36:11 AM CST To: users@httpd.apache.org<mailto:users@httpd.apache.org> Subject: Re: [users@httpd] Load balancing with load detection on backend servers ? The only real question is how the load value of the backend systems can be known and then "told" to Apache. I had proposed awhile ago using some sort of custom HTTP X-header to send that info. On Nov 19, 2014, at 3:28 AM, ulrich.her...@t-systems.com<mailto:ulrich.her...@t-systems.com> wrote: Hi all, I know the load_balancing-policies bybusyness, byrequests, bytraffic and heartbeat. We have a frontend apache, that acts as forwarding proxy to 8 backend servers. BUT: We want do route the next request to that backend server with least load. Is there any apache module, that can do this ? (We use linux and apache 2.4) Heartbeat is not usable, because our backends do not run apache, but something else. Uli ________________________________ To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org<mailto:users-unsubscr...@httpd.apache.org> For additional commands, e-mail: users-h...@httpd.apache.org<mailto:users-h...@httpd.apache.org>
