
Introduction
Welcome to the Official Red Hat Linux Reference Guide.
The Official Red Hat Linux Reference Guide contains useful information about your Red Hat Linux
system. From fundamental concepts, such as the structure of the Red Hat Linux filesystem, to the finer
points of system security and authentication control, we hope you will find this book to be a valuable
resource.
This guide is for you if you want to learn a bit more about how your Red Hat Linux system works.
Topics that you will explore include the following:
• Booting Red Hat Linux — Information about runlevels, rc.d directories, and how to start your
favorite applications at boot time.
• The /proc file system — Provides you with the kernel’s view of the system.
• The GRUB boot loader — A behind the scenes look at GRUB and how it boots your system.
• The ext3 File System — Learn how to add or remove the ext3 file system from storage devices.
• System and network security guides — Find out the most common methods used by attackers to
compromise your system and how to prevent security problems.
• Apache directives — A look at the default Apache configuration and the options available.
Before reading this guide, you should be familiar with the contents of the Official Red Hat Linux
Installation Guide concerning installation issues, the Official Red Hat Linux Getting Started Guide for
basic Linux concepts and the Official Red Hat Linux Customization Guide for general customization
instructions. The Official Red Hat Linux Reference Guide contains information about advanced topics
that may not affect every user, depending upon how they use their Red Hat Linux system.
HTML and PDF versions of all Official Red Hat Linux manuals are available online at
http://www.redhat.com/docs.
Note
Although this manual reflects the most current information possible, you should read the Red Hat
Linux Release Notes for information that may not have been available prior to our documentation
being finalized. The Release Notes can be found on the Red Hat Linux CD #1 and online at:
http://www.redhat.com/docs/manuals/linux
1. Finding Appropriate Documentation
You need documentation that is appropriate to your level of Linux expertise. Otherwise, you might
feel overwhelmed or not find the necessary information to answer your questions. The Official Red
Hat Linux Reference Guide deals with the more technical aspects and options of your Red Hat Linux
system. This section will help you decide whether to look in this manual for the information you need
or consider other Red Hat Linux manuals, including online sources, in your search.
Three different categories of people use Red Hat Linux, and each of these categories require differ-
ent sets of documentation and informative sources. To help you figure out where you should start,
determine your own experience level:
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