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From Start to Finish  

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Your web server is running perfectly according to Nagios, but is it delivering the intended user experience? End-to-end monitoring lets you know whether your application is performing as expected.

Assembly Kit  

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OpenStack is attracting lots of publicity. Is the solution actually qualified as a cloud prime mover? We take a close look at the OpenStack cloud environment and how it works.

Control Center  

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Software Defined Networking (SDN) marks a paradigm shift toward a more holistic approach for managing networking hardware. The Floodlight OpenFlow controller offers an easy and inexpensive way to experience the power of SDN.

Ground Control  

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The Spacewalk server provides a comprehensive framework for managing Linux systems, and if you need to automate tasks, the XML-RPC-based API and the spacecmd tool are useful aids. We compare the two variants.

Cloud in a Box  

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If you don't trust the cloud services of Amazon or cannot store customer data there for privacy reasons, you can create your own Eucalyptus cloud that is compatible with the Amazon tools and can be installed in a flash.

Stack Check  

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Apache's CloudStack offers flexibility and some powerful networking features.

Painting by Numbers  

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Logfiles contain extremely useful traces of everyday events – if only they weren't so boring. Fortunately, special tools help you generate and even animate colorful, easily interpretable graphics.

Errant Bits  

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System memory is extremely important to your applications, which is why many systems use error-correcting code (ECC) memory. ECC memory can typically detect and correct single-bit memory errors, and Linux has a reporting capability that collects this information.

Reaching for the Stars  

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The OpenNebula enterprise cloud management platform emerged in 2005, so it has been on the market longer than many comparable products. In the current version 4.2 (code-named Flame), it has presented itself in a new guise.

Cloud Wars  

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In some particularly sophisticated DDoS attacks, the attackers rely on and target the cloud, allowing attackers to work around conventional defense mechanisms. We explain how a DDoS attack in the cloud works, and how you can defend against it.

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