Nowadays Linux runs on almost anything. You can get a cheap PC and turn it into a media station or web server or whatever else you wish at no additional cost. Hardware is cheap also. With the advent of the Raspberry Pi and similar small computer boards one can get a fully-functional PC for the price you’d usually pay for a sixpack of beer. In this LinuxConfig series we’ll not only build a Linux computer; we’ll build an entire Linux cluster with four nodes and learn how to manage it so that all the nodes respond at the same time to the same commands.