TuxTraining

One way to find your version of Red Hat is to type the following:

cat /etc/redhat-release

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A “service” is a program that starts automatically when you start your computer, and runs in the background. For example, the “network” service sets up your connection to the Internet and keeps it running correctly.

There are two ways to manage services in Fedora, one using the graphical tools, and one using only the command line. If you’re not in a graphical environment, use the command line method.

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A cluster usually refers to a group of computers connected together so that more computer power, e.g., more MIPS (millions instruction per second), can be achieved or higher availability (HA) can be obtained.

Beowulf, Super Computer for the “Poor” Approach

Most super computers in the world are built on the concept of parallel processing–high-speed computer power is achieved by pulling the power from each individual computer. Made by IBM, “Deep Blue”, the super computer that played chess with the world champion Garry Kasprov, was a computer cluster that consisted of several hundreds of RS6000s. In fact, many big time Hollywood movie animation companies, such as Pixar, Industrial Light and Magic, use computer clusters extensively for rendering (a process to translate all the information such as color, movement, physical properties, etc., into a single frame of picture).

In the past, a super computer was an expensive deluxe item that only few universities or research centers could afford. Started at NASA, Beowulf is a project of building clusters with “off-the-shelf” hardware (e.g., Pentium PCs) running Linux at a very low cost.

In the last several years, many universities world-wide have set up Beowulf clusters for the purpose of scientific research or simply for exploration of the frontier of super computer building.

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These are some decent guides for securing your Red Hat Linux 5 system provided by the US Government’s NSA. Enjoy

Hardening Tips Pamphlet for the Red Hat Enterprise Linux 5

Guide to the Secure Configuration of Red Hat Enterprise Linux 5

Source