This book provides a concise answer to how one should organize a robust enterprise IT infrastructure based on open-source software with mainstream hardware. It is a necessity for large organizations to build a central user - thentication service, global user information storage, and to o?er common access to personal ?les regardless of the location the user wishes to connect from. All these issues have been addressed with the help of well-established technologies such as the industry standard Kerberos for user authentication and the OpenAFS distributed ?le system, originally conceived at CMU...