This book is designed as an Ubuntu 12.04 server reference, covering the Ubuntu servers and their support applications. Server tools are covered as well as the underlying configuration files and system implementations. The emphasis is on what administrators will need to know to perform key server support and management tasks. Topics covered include software management, Upstart service management and runlevels, AppArmor security, and the Network Time Protocol. Key servers are examined, including Web (Apache), FTP (vsftpd), printing (CUPS), NFS, and Samba (Windows). Network support servers and applications covered include the Squid proxy server, the Domain Name System (BIND) server, DHCP, distributed network file systems (GFS), firewalls (IPtables), and cloud computing.