The Official Ubuntu Server Book - Kyle Rankin, Benjamin Mako Hill - Google Books

http://books.google.de/books?id=RCNfvSOSjGAC&pg=PT373&dq=

Ubuntu Server is a complete, free server operating system that just works, with the extra Ubuntu polish, innovation, and simplicity that administrators love. Now, there’s a definitive, authoritative guide to getting up-and-running quickly with the newest,…