Data synchronization (load balancing)

[utkung]

Hi, I have a problem:
upstream backend {
			server 172.16.0.1:80;
			server 172.16.0.2:80;
}	
server {
			listen 80;
			server_name		www.domain.com;
			location / {
				proxy_pass	http://backend;
			}
		}
Now I have the model as above, but I don't know can configure to sync
data between 2 servers? please, help me ...

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,219113,219113#msg-219113