I am trying to understand possibilities if i need in future. I am preparing to open a network on WordPress MultiSite with HyperDB. I want to let users open subdomain sites with registration and i need a solution for using a 2nd server when need.
There is 1 main site and subdomains are not connecting each other. I need somehow forward requests to other server if blog_id > 50000 There is some "old" duscussions about it: http://codex.wordpress.org/How_to_Scale_WPMU
The idea is to receive all incoming requests on a single HTTP server. This server, using mod_proxy and mod_rewrite, will route requests to X backend servers, acting as a reverse proxy.
Well, I am barely managing a server and really newbie on this area. How can i do this?