How to connect two cloud servers?
I'm obviously using the wrong search terms, the answer must be somewhere out there, so please throw some URLs at me.
I'm about to create a cluster with 2 virtual servers in the cloud, namely at Rackspace.
One for the frontend (Apache+PHP), one for the backend (presumably PostgreSQL).
Apart from pointing the database host to the another IP instead of localhost, and opening up the , is there anything else I'm supposed to learn or prepare to fully utilize this architecture?