Klaus Knopper is the creator of Knoppix and co-founder of the LinuxTag expo. He currently works as a teacher, programmer, and consultant. If you have a configuration problem, or if you just want to learn more about how Linux works, send your questions to: klaus@linux-magazine.com

Tune up your systems and search out bottlenecks with these handy performance tools.

If you work with third-party hardware drivers, or even if you just need to fix a broken system, someday you might need to upgrade the Linux kernel.

Tired of copying and recopying files from your laptop to the office file server? Maybe you need an automated offline filesystem, such as OFS.

Add security to your website with a one-time password system.

A virtual appliance combines the benefits of virtualization with the simplicity of a single-service device. We show you how to roll your own virtual appliances with VWware Studio and SUSE Studio.

Have you ever dreamed of backing up your laptop data on the Internet and synchronizing multiple computers independently of the operating system? The Dropbox online service grants this wish with just a couple of mouse clicks.

Cobbler helps you install new systems in a hurry. We'll show you how to use this nifty shoemaker to deploy Xen and VMware virtual machines.