FAI is a non interactive system for installing a Debian GNU/Linux operating system on a PC gathered. You can also take one or more virgin PCs, there turn on the power as well as do it after a few minutes Linux is installed, configured and running on the whole cluster, lacking any interface required. Thus it's a scalable technique for installing as well as updating a cluster unattended with the little attempt concerned with it. FAI also makes use of the Debian allocation and a collection of shell- and Perl-scripts for the installation process. Any adjustment to the configuration files of the operating system are completed by cfengine, shell and Perl scripts. By making use of FAI, an unattended and fully computerized installation of a Linux cluster which encloses of 16 dual Pentium Pc's and a beowulf cluster with 20 1GHz AMD nodes was performed. FAI's objective is to group are system administrators how to install Debian onto one or even hundreds of computers. Since it's a universal purpose installation tool, it use can be made by installing a beowulf cluster, a interpretation farm, a web server farm or a Linux laboratory or a classroom. Also important linux networks with dissimilar hardware and diverse installation necessities are also easy to institute by using FAI.