gistfile1.txt

user  blah;
worker_processes  6;
error_log  logs/error.log  debug;
pid        logs/nginx.pid;
events {
    worker_connections  1024;
}
http {
    include       conf/mime.types;
    default_type  application/octet-stream;
.......

    upstream mongrel_site_one {
        server 127.0.0.1:15001;
        server 127.0.0.1:15002;
    }
    server {
        listen          real_ip_number:80;
        root            /rails/site_one/current/public;
        server_name   www.site_one.com site_one.com;
         ........
            if (!-f $request_filename) {
            proxy_pass http://mongrel_site_one;
                break;
            }
         } #server


    upstream mongrel_site_two {
        server 127.0.0.1:15003;
        server 127.0.0.1:15004;
    }
    server {
        listen          real_ip_number:80;
        root            /rails/site_two/current/public;
        server_name   www.site_two.com site_two.com;
         ........
            if (!-f $request_filename) {
            proxy_pass http://mongrel_site_two;
                break;
            }
         } #server
} #http