XtreemOS is a grid operating system based on Linux. The main particularity of XtreemOS is that it provides for Grids what a traditional operating system offers for a single computer: hardware transparency and secure resource sharing between different users. It thus simplifies the work of users by giving them the illusion of using a traditional computer while removing the burden of complex resource management issues of a typical Grid environment. When a user runs an application on XtreemOS, the operating system automatically finds all resources necessary for the execution, configures users credentials on the selected resources and starts the application.
See the official website for more informations: http://www.xtreemos.eu/
See installation tutorial here: http://xtreemos-user.wiki.irisa.fr/tiki-index.php?page=Installation+tutorial&bl