From Rivendell Wiki
Rivendell Broadcast Appliance CD (CentOS 64 bit only)
The easiest way to install Rivendell is to use the Rivendell Broadcast Appliance CD which is based on the CentOS operating system (64 bit only). It can be downloaded from here.
The Rivendell Broadcast Appliance CD installs a pre-configured Linux Operating System and the complete Rivendell Radio Automation System software package on your computer. It will completely replace any operating systems and other data installed on the target system. It is vital that any existing data that needs to be retained be backed up to external media before beginning the installation!
If you download and install the Appliance CD there is no need to read any of the other information on this page! Simply follow the installation instructions on the Rivendell Broadcast Appliance CD webpage.
After you have installed the Rivendell Broadcasting Appliance CD you should follow the instructions in the post installation configuration tasks.
Rivendell can be installed onto a RHEL/CentOS system using an installer script. This is now the preferred option when installing new machines. There are two sets of instructions depending on the version of RHEL/CentOS that you are using.
All information below is out of date and needs to be updated
Rivendell on Debian 6 (Squeeze). This is intended as a beginners guide that will walk you through getting Rivendell, JACK and Pulse Audio working with Debian 6. It is screen shot and explanation heavy.
The easiest way to install Rivendell using Ubuntu is to use the RRAbuntu Live CD installer. You can also test it out without installing the software.
A complete guide for installing Rivendell on Ubuntu 11.04 can be found here.