Multi-Site sessions

Hi all, Im developing an application that runs on multiple physical boxes (and thus different hostnames). Both of the boxes will run the same application (connecting to a shared postgres server). What I need is when someone logs in on box 1 (ie. box1.domain.com), and then traverses via a link to box 2 (ie. box2.domain.com), he or she will not have to login again.

That's what the :session_domain key for the session options is for. Maybe there's more to your setup that you haven't described but if it is exactly the same code running on the various boxes and you just happen to have multiple ones because 1 couldn't service your load then you don't need this at all. You can stick a load balancer in front, users always go to www.domain.com and the load balancer spreads the requests out to your various machines (the load balancer can be anything from specialised hardware to software like haproxy, nginx or apache).

Fred