We review Pulling Strings with Puppet, Scalix: Linux Administrator's Guide, and Pro PHP: Patterns, Frameworks, Testing and More.

Conventional, woodpecker-style port knocking is open to sniffing and brute force knocking attacks. Sending an encrypted packet with an access request to the server is safer and more modern. Learn more about Firewall Knock Operator, a.k.a. Fwknop.

How much power is your system really using? And how much can you actually save with the new generation of energy-conserving techniques and components? This month we study the phenomenon known as Green IT.

NX provides fast terminal services, even over slow connections.

Windows terminal services in Linux with Rdesktop

AuFS offers a painless filesystem for a thin client, and FS-Cache provides a persistent cache.

Sun Microsystems has now released a management solution following its Xen-based virtualization solution, XVM.

What is the real meaning of those little “load average” values in the output of shell commands like procinfo and uptime, and what can you do with these numbers?