Hi all!
I've tried to find out some articles/tutorials/howtos from web, howto create a big cocoon site.
Currently using: - tomcat 4.1.29 - cocoon 2.1.3 - apache 2.0.something
There is coming a request for HA and for power for my cocoon application and it will be first be running on 2 servers and then later on more servers.
Question is: How to make it work fine?
Use some load balancing in apache?
What if user 1 has a session establish on server A and then load balancer throws it to server B, is session still valid? How to make sure that sessions stay valid? Should I make session store to a SQL-server (running on server C, later on C and D with replication).
My "dream" is to have a framework (cocoon) which, when more power needed, I would just insert 1 new server to rack and after it has been configured, it's powers would be in use without touching the application running on that framework.
Atleast minimum two servers is needed for HA and it has also session etc problems to solve.
I'm busily setting this up for myself at the moment.
Check out http://wiki.cocoondev.org/Wiki.jsp?page=LoadBalancingWithModProxy for one way of doing it.
So, what you do is have Tomcat or Jetty attach a machine identifier to the end of the session ID. That identifier is then used by Apache load balancer to forward requests to the relevant backend. That way you don't have to replicate sessions across servers.
Regards, Upayavira
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