the complete reference - red hat enterprise linux & fedora ed 2004

Learn to deploy and manage Web proxy, mail,and print server, and administer users, software, and file systems.• Install, manage, secure, and administer Enterprise Linux 3.0 andFedora • M

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Red Hat: The Complete Reference Enterprise Linux & Fedora Edition: The Complete Reference

by Richard L Petersen ISBN:0

07223 0754 McGraw-Hill © 2004 (797 pages)

Use this comprehensive guide to maximize the powerful capabilities of Red Hat Enterprise and Fedora Linux Coverage includes Bluecurve, KDE, GNOME, deploying and managing servers and users, the 2.6 kernel, system and network security, and more.

Kerberos, and firewalls Learn to deploy and manage Web proxy, mail,and print server, and administer users, software, and file systems.

• Install, manage, secure, and administer Enterprise Linux 3.0 andFedora

• Master Bluecurve, KDE, GNOME, office and multimedia applications,the shell, file systems, and Internet clients

• Deploy and manage servers-vsftpd and ProFTP (FTP), Apache(Web), Sendmail and Postfix (mail), Squid (proxy), CUPS (print),and HTDig (search), SAMBA and NFS (file), NIS, and BIND (DNS),and DHCP

• Master the complete suite of Red Hat system and network

administration tools

• Manage users, services, journaling file systems, RAID devices, LVMvolumes, and printers

• Reconfigure the 2.6 kernel and its modules

• Ensure system and network security using packet filtering,

authentication, digital signatures, VPNs, IPSEC, and encryption

• Deploy powerful desktop, office, database, graphic, editing, andInternet applications

About the Author

Richard Petersen, MLIS, teaches UNIX and C/C++ courses at the

University of California at Berkeley He is the author of Linux: The

Complete Reference (all four editions), Linux Programming: A Beginner's Guide, and many other titles.

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To arrange bulk purchase discounts for sales promotions, premiums, or fund-raisers, please contact

McGraw-Hill/Osborne at the above address For information on translations or book distributors outside the

U.S.A., please see the International Contact Information page immediately following the index of this book.Copyright © 2004 by The McGraw-Hill Companies All rights reserved Printed in the United States ofAmerica Except as permitted under the Copyright Act of 1976, no part of this publication may be

reproduced or distributed in any form or by any means, or stored in a database or retrieval system, withoutthe prior written permission of the publisher, with the exception that the program listings may be entered,stored, and executed in a computer system, but they may not be reproduced for publication

Kelly Stanton-Scott

Illustrators

Kathleen Fay Edwards,

Melinda Moore Lytle

Series Design

Peter F Hancik, Lyssa Wald

This book was composed with Corel VENTURA™ Publisher

Information has been obtained by McGraw-Hill/Osborne from sources believed to be reliable However, because of the possibility of human or mechanical error by our sources, McGraw-Hill/Osborne, or others,

McGraw-Hill/Osborne does not guarantee the accuracy, adequacy, or completeness of any information and

is not responsible for any errors or omissions or the results obtained from use of such information

To my sisters-in-law, Marylou and Valerie

About the Author

Richard Petersen holds a M.L.I.S in Library and Information Studies He currently teaches Unix and C/C++

courses at the University of California, Berkeley

About the Technical Reviewer

Ibrahim Haddad is a Researcher at the Open System Lab (Ericsson Corporate Unit of Research), located

in Montreal, Canada He is involved with the system architecture of third-generation wireless IP networks andrepresents Ericsson on the Technical Board of the Open Source Development Labs, the Carrier Grade LinuxWorking Group His other commitments include serving as Contributing Editor to the Linux Journal andLinuxWorld magazine as well as contributing articles to the O'Reilly Network and Linux User & Developermagazine He has delivered a number of presentations and tutorials at local universities, IEEE and ACMconferences, Open Source forums, and international conferences Ibrahim contributed to Richard Petersen's

book Red Hat Linux Pocket Administrator, published by McGraw-Hill/Osborne He received his bachelor and

master degrees in Computer Science from the Lebanese American University He is currently a Dr Sc.Candidate at Concordia University in Montreal Academic awards include the "J W McConnell MemorialGraduate Fellowship" and the "Concordia University 25th Anniversary Fellowship," both received in 2000

About the Technical Editor

Dean Henrichsmeyer has been using Linux since 1995 He has a B.S in Computer Science and has been

an active member of the Linux community, presenting at Linux focused tradeshows such as LinuxWorldConference and Expo He's worked for VA Research (now known as VA Software) since 1999 He currently

is working for OSDN, the Open Source Development Network, where, among other things, he is the sitedirector for Linux.com

Acknowledgments

I would like to thank all those at McGraw-Hill/Osborne, who made this book a reality: Tracy Dunkelberger,Editorial Director, for her continued encouragement and analysis as well as management of such a complexproject; Dean Henrichsmeyer and Ibrahim Haddad, technical editor and technical reviewer, whose analysisand suggestions proved very insightful and helpful; Jessica Wilson, acquisitions coordinator, who providedneeded resources and helpful advice; Bob Campbell, copy editor, for excellent editing as well as his

insightful comments; and project editor Carolyn Welch, who incorporated the many features found in thisbook and coordinated the intricate task of generating the final version Thanks also to Scott Rogers whoinitiated the project

Special thanks to Linus Torvalds, the creator of Linux, and to those who continue to develop Linux as anopen, professional, and effective operating system accessible to anyone Thanks also to the academiccommunity, without whose special dedication Unix would not be the flexible and versatile operating system it

is today I would also like to thank professors and students at the University of California, Berkeley, for theirexperience and support in developing new and different ways of understanding operating system

I would also like to thank my parents, George and Cecelia, and my brothers George, Robert, and Mark fortheir support and encouragement with such a difficult project Also Valerie and Marylou and my nieces andnephews Aleina, Larisa, Justin, Christopher, and Dylan, for their support and deadline reminders

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Introduction

The Red Hat Linux distribution has become one of the major Linux distributions, bringing to the PC all thepower and flexibility of a Unix workstation as well as a complete set of Internet applications and a fullyfunctional desktop interface This book is designed not only to be a complete reference on Linux, but alsoprovides clear and detailed explanations of Linux features No prior knowledge of Unix is assumed; Linux is

an operating system anyone can use

Red Hat has split its Linux development into two lines: Red Hat® Enterprise Linux® and the Fedora™Project Red Hat Enterprise Linux features commercial enterprise products for servers and workstations, withcontrolled releases issued every two years or so The Fedora Project is an Open Source initiative whoseFedora Core release will be issued every six months on average, incorporating the most recent developments

in Linux operating system features as well as supported applications The Fedora release consists entirely ofOpen Source software Development is carried out, using contributions from Linux developers, allowing them

to promote enhancements, new features, and cutting-edge applications The project operates like other opensource projects, with releases keeping pace with the course of rapid online development Unlike Red HatEnterprise Linux, the Fedora Core version of Linux is entirely free, though not supported by Red Hat, Inc.You can download the most current version, including test betas, from fedora.redhat.com The FedoraProject release will replace the original entry-level Red Hat Linux distribution The Fedora Project will alsoprovide Fedora extras, software that enhances the core collection, and Fedora alternatives, popular

alternatives to core software applications

The Red Hat Enterprise line of products is designed for corporate, research, and business applications.These products focus on reliability, stability, and performance They are released on a much more controlledschedule than the Fedora Project versions What was once the low-cost consumer version of Red Hat Linuxwill be replaced by a scaled-down commercial Enterprise version for consumers and small businesses RedHat offers three Enterprise versions: one for the workstation and two for servers Red Hat Enterprise ASprovides the highest level of support from intense mission critical requirements for all aspects of networksupport, including servers, databases, and security Red Hat Enterprise ES provides a similar package butone geared to mid-level business requirements The Red Hat Enterprise WS implements a workstation with awide range of clients that can be used for either Red Hat Enterprise ES or AS networks

This book covers the current Fedora Core release, while maintaining compatibility with Red Hat EnterpriseLinux The complete Fedora Core release is provided on the DVD-ROM included with this book This bookidentifies seven major Linux topics: Basic setup, environments, applications, security, servers, systemadministration, and network administration Whereas the book details the latest Red Hat tools, desktops,and kernel featured in the Fedora Project, it also covers in depth the network servers, administrative tasks,and applications featured in Red Hat Enterprise Linux The book can be used as a comprehensive referencefor both Red Hat Enterprise Linux and the Fedora Project

The first two sections of the book are designed to cover tasks you would need to perform to get your system

up and running After an introduction to the working environment, including both GNOME and KDE desktops,you learn how to quickly update your system, manage users and groups, and set up your printer using theRed Hat administrative tools The software management is nearly automatic, letting you install software onyour system, including applications, with just a couple of mouse clicks Internet access can be set up formodems, DSL, wireless, and Ethernet networks with easy-to-use administrative tools that guide you everystep of the way Many people now use Linux to set up a home or local business network The steps involved

to implement a basic network can now be carried out using simple software tools You can even installBluetooth devices All these topics are covered in greater detail later in the book

GNOME and the K Desktop Environment (KDE) have become standard desktop Graphical User Interfaces(GUI) for Linux and are noted for their power, flexibility, and ease-of-use These are complete desktop

environments that are more flexible than either Windows or the Mac/OS You can install both, run

applications from on the other, and easily switch from one to the other Both have become integrated

components of Linux, with applications and tools for every kind of task and operation Instead of treatingGNOME and KDE as separate entities, GNOME and KDE tools and applications are presented throughoutthe book

Linux is also a fully functional Unix operating system It has all the standard features of a powerful Unixsystem, including a complete set of Unix shells such as BASH, TCSH, and the Z-shell Those familiar withthe Unix interface can use any of these shells, with the same Unix commands, filters, and configurationfeatures.

For the Internet, Linux has become a platform for very powerful network applications With Linux you canbecome a part of the Internet by creating your own Web and FTP sites Other users can access your Linuxsystems, several at the same time, using different services You can also use very powerful GNOME, KDE,and Unix clients for mail and news Linux systems are not limited to the Internet You can use it on any localintranet, setting up an FTP or Web site for your network Red Hat Linux comes equipped with variety of fullyfunctional servers already installed and ready to use

A wide array of applications operates on Red Hat Linux Numerous GNOME and KDE applications arecontinually released through their respective Web sites The GNU general public licensed software providesprofessional-level applications such as programming development tools, editors, and word processors, aswell as numerous specialized applications such as those for graphics and sound A massive amount of

software is available at online Linux sites like sourceforge.net where you can download Open Source

applications and then easily install them onto your system

Since this book is really five books in one-a user interface book, a security book, a server book, a networkingbook, and an administration book-how you choose to use it depends upon how you want to use your RedHat Linux system Almost all Linux operations can be carried out using either the GNOME or KDE

interfaces You can focus on the GNOME and KDE chapters and their corresponding tools and applications

On the other hand, if you want to delve deeper into the Unix aspects of Linux, you can check out the Shellchapters and the corresponding shell-based applications in other chapters If you only want to use Linux forits Internet services, then you should concentrate on the Internet clients and servers If you want to useLinux as a multiuser system servicing many users or integrate it into a local network, you can use thedetailed system, file, and network administration information provided in the administration chapters None ofthese tasks are in any way exclusive If you are working in a business environment, you will probably makeuse of all three aspects Single users may concentrate more on the desktops and the Internet features,whereas administrators may make more use of the security and networking features

Part I of this book is designed to help you start using Red Hat Linux quickly It provides an introduction toRed Hat Linux along with a listing of Linux resources, including software repositories, documentation sites,newsgroups, and Linux news and development sites The next chapter covers the streamlined installationprocedure for most distributions, which takes about 30 minutes or less The installation program from RedHat provides excellent commentary, describing each step in detail In this section you also learn the

essentials of using both GNOME and KDE, along with the basics of working on the shell command line.System configuration tasks like adding printers and creating new user accounts are presented with theeasiest methods, without much of the complex detail described in the administration chapters that is

unnecessary for basic operations Basic network configuration tasks are discussed such as setting up aLAN, DSL, or Wireless connection to an Internet Service Provider (ISP) You also learn the basics of how toset up a small local network

Part II of this book deals with Red Hat Linux environments Here you are introduced to the different kinds ofuser environments available for Linux, starting with KDE and GNOME Different features such as applets, thePanel, and configuration tools are described in detail With either of these interfaces, you can run all yourapplications using icons, menus, and windows At any time, you can open up a terminal window throughwhich you can enter standard Linux commands on a command line You can also choose to use just thestandard Unix command line interface to run any of the standard Unix commands Next, the BASH shell andits various file, directory, and filter commands are examined

Part III of this book discusses in detail the many office, multimedia, and Internet applications you can use onyour Linux system, beginning with Office suites like OpenOffice and KOffice The different database

management systems available are also discussed along with the Web site locations where you can

download them A variety of different text editors are also available, including several GNOME and KDEeditors, as well as the Vim (enhanced VI), gvim (graphical Vi), and GNU Emacs editors Linux automaticallyinstalls mail, news, FTP, and Web browser applications, as well as FTP and Web servers Both KDE andGNOME come with a full set of mail, news, FTP clients, and Web browsers There are also many

independent mail clients, newsreaders, and Internet tools you can easily install from your desktop

Part IV demonstrates how to implement security precautions using encryption, authentication, and firewalls.Coverage of the General Public License Privacy Guard (GPG) shows you how to implement public andprivate key based encryption IPsec tools let you use the IPSEC protocol to encrypt and authenticatenetwork transmissions Network security topics cover firewalls and encryption using netfilter (iptables) toprotect your system, the Secure Shell (SSH) to provide secure remote transmissions, and Kerberos toprovide secure authentication.

Part V discusses Internet servers you can run on Red Hat Linux, including FTP, Web, and DNS servers.Internet servers have become integrated components of most Linux systems Both the standard vsftpd FTPserver and the ProFTPD server with its directive format are presented, covering features like guest and virtualFTP sites The Apache Web server chapter covers standard configuration directives like those for automaticindexing as well as the newer virtual host directives Sendmail, Postfix, IMAP, and POP mail servers arecovered The INN news server, CUPS print server, the Squid proxy server, and the ht:/DIG search server arealso examined

Part VI discusses system administration topics including user, software, file system, device, and kerneladministration There are detailed descriptions of the configuration files used in administration tasks and how

to make entries in them First, basic system administration tasks are covered such as selecting runlevels,monitoring your system, and scheduling shutdowns Then aspects of setting up and controlling users andgroups are discussed Presentations include both the GUI tools you can use for these tasks and the

underlying configuration files and commands Software installation has been simplified with package

management systems like the Red Hat Package Manager (RPM) and redhat- config-packages Then,different file system tasks are covered such as mounting file systems, selecting device names, configuringRAID devices and LVM volumes, and using CD and DVD R/RW drives Device configuration covers topicssuch as device files, installing printers, and using the kernel modules to support new devices Using,

updating, and configuring the Linux kernel with its modules is covered in detail along with procedures forinstalling new kernels

Part VII covers network administration topics such as configuring remote file system access and setting upfirewalls Configuration files and features for the Domain Name System (DNS) and its BIND server areexamined in detail along with features like virtual domains and IP aliases With Linux you can easily set upyour own Domain Name server for a local network You also learn how to implement your own Dynamic HostConfiguration Protocol (DHCP) server to dynamically assign hosts IP addresses The various network filesystem interfaces and services like NFS for Unix and NIS networks are presented The chapter on Sambashows you how to access Windows file systems and printers Then, the different aspects of network

administration are discussed such as network connections and routes, Domain Name services, Hostnamedesignations, IP virtual hosts, and IP masquerading Finally, there is an appendix covering what is available

on the DVD-ROM included with this book

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Part I: Getting Started

Chapter List

Chapter 1: Introduction to Red Hat Linux

Chapter 2: Installing Red Hat and Fedora Core Linux

Chapter 3: Interface Basics

Chapter 4: Red Hat System Configuration

Chapter 5: Red Hat Network Configuration

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Chapter 1: Introduction to Red Hat Linux

Overview

Linux is a fast, stable, and open source operating system for PC computers and workstations that features

professional-level Internet services, extensive development tools, fully functional graphical user interfaces(GUIs), and a massive number of applications ranging from office suites to multimedia applications Linuxwas developed in the early 1990s by Linus Torvalds, along with other programmers around the world As anoperating system, Linux performs many of the same functions as Unix, Macintosh, Windows, and Windows

NT However, Linux is distinguished by its power and flexibility, along with being freely available Most PCoperating systems, such as Windows, began their development within the confines of small, restrictedpersonal computers, which have only recently become more versatile machines Such operating systemsare constantly being upgraded to keep up with the ever-changing capabilities of PC hardware Linux, on theother hand, was developed in a different context Linux is a PC version of the Unix operating system that hasbeen used for decades on mainframes and minicomputers and is currently the system of choice for networkservers and workstations Linux brings the speed, efficiency, scalability, and flexibility of Unix to your PC,taking advantage of all the capabilities that personal computers can now provide

Technically, Linux consists of the operating system program, referred to as the kernel, which is the part

originally developed by Linus Torvalds But it has always been distributed with a massive number of softwareapplications, ranging from network servers and security programs to office applications and developmenttools Linux has evolved as part of the open source software movement, in which independent programmersjoined together to provide free quality software to any user Linux has become the premier platform for opensource software, much of it developed by the Free Software Foundation's GNU project Many of theseapplications are bundled as part of standard Linux distributions Currently, thousands of open source

applications are available for Linux from sites like the Open Source Development Network's (OSDN)

sourceforge.net, the software depositories rpmfind.net and freshmeat.net, KDE's apps.kde.com, andGNOME's www.gnome.org

Along with Linux's operating system capabilities come powerful networking features, including support forInternet, intranets, and Windows and Apple networking As a norm, Linux distributions include fast, efficient,and stable Internet servers, such as the Web, FTP, and DNS servers, along with proxy, news, and mailservers In other words, Linux has everything you need to set up, support, and maintain a fully functionalnetwork

With the both GNOME and K Desktop, Linux also provides GUI interfaces with that same level of flexibilityand power Unlike Windows and the Mac, Linux enables you to choose the interface you want and thencustomize it further, adding panels, applets, virtual desktops, and menus, all with full drag-and-drop

capabilities and Internet-aware tools

Linux does all this at the right price Linux is free, including the network servers and GUI desktops Unlikethe official Unix operating system, Linux is distributed freely under a GNU General Public License as

specified by the Free Software Foundation, making it available to anyone who wants to use it GNU (theacronym stands for "GNU's Not Unix") is a project initiated and managed by the Free Software Foundation toprovide free software to users, programmers, and developers Linux is copyrighted, not public domain.However, a GNU public license has much the same effect as the software's being in the public domain TheGNU general public license is designed to ensure Linux remains free and, at the same time, standardized.Linux is technically the operating system kernel, the core operations, and only one official Linux kernelexists People sometimes have the mistaken impression that Linux is somehow less than a professionaloperating system because it is free Linux is, in fact, a PC, workstation, and server version of Unix Manyconsider it far more stable and much more powerful than Windows This power and stability have made Linux

an operating system of choice as a network server

To appreciate Linux completely, you need to understand the special context in which the Unix operatingsystem was developed Unix, unlike most other operating systems, was developed in a research and

academic environment In universities, research laboratories, data centers, and enterprises, Unix is thesystem most often used Its development has paralleled the entire computer and communications revolution

over the past several decades Computer professionals often developed new computer technologies on Unix,such as those developed for the Internet Although a sophisticated system, Unix was designed from thebeginning to be flexible The Unix system itself can be easily modified to create different versions In fact,many different vendors maintain different official versions of Unix IBM, Sun, and Hewlett-Packard all sell andmaintain their own versions of Unix The unique demands of research programs often require that Unix betailored to their own special needs This inherent flexibility in the Unix design in no way detracts from itsquality In fact, this flexibility attests to the ruggedness of Unix, allowing it to adapt to practically any

environment This is the context in which Linux was developed Linux is, in this sense, one other version ofUnix-a version for the PC The development of Linux by computer professionals working in a research-likeenvironment reflects the way Unix versions have usually been developed Linux is publicly licensed andfree-and reflects the deep roots Unix has in academic institutions, with their sense of public service andsupport Linux is a top-rate operating system accessible to everyone, free of charge

As a way of introducing Linux, this chapter discusses Linux as an operating system, the history of Linux andUnix, the overall design of Linux, and Linux distributions This chapter also discusses online resources fordocumentation, software, and newsgroups, plus Web sites with the latest news and articles on Linux Weband FTP site listings are placed in tables for easy reference Here you can find sites for different

distributions, Linux publications, software repositories, and Linux development, as well as for office suitesand commercial databases

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Red Hat and Fedora Linux

Red Hat Linux is currently the most popular Linux distribution As a company, Red Hat provides softwareand services to implement and support professional and commercial Linux systems Red Hat has split itsLinux development into two lines: Red Hat Enterprise Linux and the Fedora Project Red Hat EnterpriseLinux features commercial enterprise products for servers and workstations, with controlled releases issuedevery two years or so The Fedora Project is an Open Source initiative whose Fedora Core release will beissued every six months on average, incorporating the most recent development in Linux operating systemfeatures as well as supported applications Red Hat freely distributes its Fedora version of Linux under theGNU General Public License; the company generates income by providing professional-level support,

consulting services, and training services The Red Hat Certified Engineers (RHCE) training and certificationprogram is designed to provide reliable and highly capable administrators and developers help to maintainand customize professional-level Red Hat systems Red Hat has forged software alliances with major

companies like Oracle, IBM, Dell, and Sun

Currently, Red Hat provides several commercial products, known as Red Hat Enterprise Linux These includethe Red Hat Enterprise Advanced Server for intensive enterprise-level tasks; Red Hat Enterprise ES, which is

a version of Linux designed for small businesses and networks; and Red Hat Enterprise Work Station RedHat also maintains for its customers the Red Hat Network, which provides automatic updating of the

operating system and software packages on your system You can also use the same Red Hat Networkupdate tool to automatically update Fedora Linux Specialized products include the Stronghold secureWebserver, versions of Linux tailored for IBM and Itanium-based servers, and GNUPro development tools

Red Hat also maintains a strong commitment to Open Source Linux applications Red Hat originated theRPM package system used on several distributions, which automatically installs and removes softwarepackages Red Hat is also providing much of the software development for the GNOME desktop, and it is astrong supporter of KDE On Red Hat, GNOME and KDE are configured to appear the same, using a

standardized interface called Bluecurve

Red Hat provides an extensive set of configuration tools designed to manage tasks such as adding users,starting servers, accessing remote directories, and configuring devices such as your monitor or printer.These tools are accessible on the System Settings and Server Settings menus and windows, as well as bytheir names, all beginning with the term "redhat-config" (see Chapters 4 and 5) Of particular note is the newpackage management tool that lets you easily install or remove software packages, arranged in recognizablecategories

Note Though Red Hat supports both the GNOME and KDE desktop interfaces, the

Bluecurve interface provides the same look and feel for both desktops,

integrating them into one visually similar interface, with menus, windows,

and panels appearing approximately the same, though their underlying

capabilities differ (see Chapters 6 and 7)

The new release of Red Hat features key updates to critical applications as well as new tools replacingformer ones Red Hat includes the GNOME desktop, the Apache Web server, GNU Compiler Collection(GCC), and GNU Java Compiler (GJC) New configuration tools, including redhat-config-packages for

managing software and redhat-config-xfree86 for configuring your display hardware, have been added andothers have been updated, redhat-config-networks, for instance, which now supports wireless networks RedHat now installs both the Postfix and Sendmail mail servers and lets you seamlessly switch between both.Installing Red Hat has become a fairly simple process, using a graphical interface with each step displayingdetailed explanations and advice The Red Hat and Fedora distributions organize their installation to cater toseveral different uses, as a server, a workstation, and a personal desktop The personal desktop optioninstalls preselected software (such as office and multimedia applications) for home and personal use Itfeatures a streamlined GNOME desktop interface The workstation option installs desktop, office,

development, and administration software The server option installs all the standard servers, including themail and FTP servers, along with default configurations and server administration tools You can also elect tocustomize your installation, selecting your own mix of installed software

The Red Hat Fedora distribution of Linux is available online at numerous FTP sites Red Hat Fedora

maintains its own FTP site at fedora.redhat.com, where you can download the entire current release ofFedora Linux, as well as updates and third-party software Red Hat was designed from its inception to work

on numerous hardware platforms Currently, Red Hat supports Sparc, Intel, and Alpha platforms See

www.redhat.com for more information, including extensive documentation such as Red Hat manuals,FAQs, and links to other Linux sites

If you purchase Red Hat Linux from Red Hat, you are entitled to online support services Although Linux isfree, Red Hat as a company specializes in support services, providing customers with its expertise indeveloping solutions to problems that may arise or using Linux to perform any of several possible tasks,such as e-commerce or database operations

The Fedora Project

The Fedora core release is maintained and developed by an Open Source project called the Fedora Project.The release consists entirely of Open Source software Development is carried out using contributions fromLinux developers, allowing them free reign to promote enhancements and new features The project isdesigned to work much like other open source projects, with releases keeping pace with the course of rapidonline development The Fedora Core versions of Linux are entirely free You can download the most currentversion, including betas, from fedora.redhat.com You can update Fedora using the Red Hat update agent(RHN) to access the Redhat Fedora Yum repository Updating can be supported by any one of several Yum

Fedora repositories, which you can configure RHN to access in the /etc/sysconfig/rhn/sources

configuration file The Fedora Project release replaces the original standard Red Hat Linux version thatconsisted of the entry-level Red Hat release In addition to the Fedora Core software, the Fedora project willalso provide popular compatible packages as part of the Fedora Extras and Fedora Alternative Collections

Red Hat Enterprise Linux

The Red Hat Enterprise line of products is designed for corporate, research, and business applications.These products focus on reliability and stability They are released on a much more controlled schedule thanthe Fedora Project versions What was once the low-cost consumer version of Red Hat Linux will be

replaced by a scaled-down commercial Enterprise version for consumers and small business Red Hat offersthree Enterprise versions-one for the workstation and two for servers Red Hat Enterprise AS provides thehighest level of support from intense mission critical requirements for all aspects of network support,

including servers, databases, and security Red Hat Enterprise ES provides a similar package, but onegeared to mid-level business requirements The Red Hat Enterprise WS implements a workstation with awide range of clients that can be used for either Red Hat Enterprise ES or AS networks

Red Hat Documentation

Red Hat maintains an extensive library of Linux documentation that is freely accessible online (see Table 1-1

) From its home page, you can link to its support page, which lists the complete set of Red Hat manuals, all

in Web page format for easy viewing with any Web browser These include the Reference Guide, the GettingStarted Guide, and the Installation Guide Tip, HOW-TO, and FAQ documents are also provided Of

particular note are the Hardware Compatibility Lists This documentation lists all the hardware compatiblewith Red Hat Linux For PC users, this includes most hardware, with few exceptions All the Red Hat

documentation is freely available under the GNU General Public License Before installing Red Hat Linux onyour system, you may want to check the online Installation guide This is a lengthy and detailed documentthat takes you through each step of the process carefully If your system is designed for any special tasks,

be sure to consult the Customization guide, which covers a variety of topics, such as automatic installation

on networks using Red Hat kickstart; network services like Samba, Apache, and FTP; system

administration tools; and software package installation and management Red Hat also provides

documentation on implementing PPP Internet connections, Samba file sharing, Apache Web server,

firewalls, and mail servers

Table 1-1: Red Hat Linux Resources

Table 1-1: Red Hat Linux Resources

www.redhat.com/support The Support page for Red Hat Linux, including

links to current online documentation

fedora.redhat.com The Fedora Project, current free Open Source

releases of Red Hat

fedora.redhat.com/docs Documentation and support tutorials for

Fedora Core releases

The Official Red Hat Linux Getting Started

Guide

A getting-started guide for first-time users

The Official Red Hat Linux x86 Installation

Guide

A detailed installation guide for Red Hat Linux

Red Hat Linux Installation Gotchas Installation troubleshooting

Red Hat Reference Guide The Red Hat Reference

Red Hat Customization Guide Topics covering common customization tasks

and tools, such as server configurations

Official Red Hat Linux Security Guide A comprehensive guide to all aspects of user,

system, and network security

Red Hat Linux System Administration

Primer

An overview of administration tasks andconcepts

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Red Hat Linux Fedora Core

Red Hat Linux Fedora Core provides several new features, along with improved aspects of Red Hat 8 and 9.Though it does not include the new 2.6 kernel, it does use the latest 2.4 kernel, 2.4.22 Several new featuresinclude Bluetooth and ACPI support:

 Enhanced Bluetooth support includes firmware loader, protocol analyzer, and personal networksupport

 The Advanced Configuration and Power Interface (ACPI) is supported with the adpid daemon

 CUPS is now the only print server included LPRng has been dropped entirely

 Support is included for DVD+R/RW writers, the dvd+rw tools

 It includes version 3.2.3 of GCC compiler, gcc32

 Internet Security Protocol (IPSEC) tools are now available

 The kernel now supports the Exec shield, which makes segments of the kernel nonexecutable,providing greater security

 The kernel can now prevent certain kernel modules from being loaded, ensuring more centralizedcontrol over the kernel configuration

 The kernel also supports a laptop mode that schedules task to accommodate laptop power-savingfeatures

 Two older mail clients have been dropped, exmh and pine

 With the kernel now including the sound support, the sndconfig tool has been dropped

 As implemented with Red Hat 9, the Fedora Core continues support for the Native POSIX ThreadLibrary (nptl) The thread library allows applications to be organized into separate threads, lettingthe processor run them more efficiently With threading, parts of code in different threads can berun at the same time

 Red Hat is continuing its migration from LILO to GRUB and will soon drop LILO altogether

 The tripwire intrusion detection software has been dropped due to development constraints

 Red Hat continues its migration to UTF-8, the Unicode encoding for a Universal Character Set(UCS) UTF-8 is compatible with standard ASCII character files and provides a standardized

method for encoding and implementing all languages UTF-8 is now the default

 The vsftp FPT server is the only FTP server now included The older Washington University FTPserver has been dropped entirely (wu-ftpd)

 As initiated with Red Hat 8, the Fedora Core continues to refine the Bluecurve interface, providing

a seamless graphical GUI for both GNOME and KDE

With the Fedora Core, Red Hat now has a complete range of Red Hat administration tools, all of whichinclude a GNOME interface (see Table 1-2)

Table 1-2: Red Hat Administration Tools

Administration Tool Operation

redhat-config-bind A Red Hat DNS configuration tool

redhat-config-date A graphical interface for modifying the system date and timeredhat-config-httpd Apache configuration tool

redhat-config-keyboard A graphical interface for modifying the keyboard

redhat-config-kickstart A graphical interface for making kickstart files

redhat-config-language A graphical interface for modifying the system language

redhat-config-mouse A graphical interface for configuring mice

redhat-config-network The network administration tool for Red Hat Linux

redhat-config-nfs The NFS server configuration tool

redhat-config-packages The package manager for Linux RPM software

Table 1-2: Red Hat Administration Tools

Administration Tool Operation

redhat-config-printer A printer configuration back end/front end combinationredhat-config-printer-gui A GUI front end for printconf

redhat-config-proc A configuration tool for operating system tunable parametersredhat-config-rootpassword A graphical interface for modifying the root password

redhat-config-samba Samba server configuration tool

redhat-config-securitylevel A graphical interface for modifying the system security levelredhat-config-services An initscript and xinetd configuration utility

redhat-config-soundcard A graphical interface for detecting and configuring sound

cardsredhat-config-users A graphical interface for administering users and groupsredhat-config-xfree86 A graphical interface for configuring XFree86

redhat-logviewer A graphical interface for viewing log files

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Operating Systems and Linux

An operating system is a program that manages computer hardware and software for the user Operating

systems were originally designed to perform repetitive hardware tasks, which centered around managingfiles, running programs, and receiving commands from the user You interact with an operating system

through a user interface, which allows the operating system to receive and interpret instructions sent by the

user You only need to send an instruction to the operating system to perform a task, such as reading a file

or printing a document An operating system's user interface can be as simple as entering commands on aline or as complex as selecting menus and icons on a desktop

An operating system also manages software applications To perform different tasks, such as editing

documents or performing calculations, you need specific software applications An editor is an example of a

software application that enables you to edit a document, making changes and adding new text The editoritself is a program consisting of instructions to be executed by the computer For the program to be used, itmust first be loaded into computer memory, and then its instructions are executed The operating systemcontrols the loading and execution of all programs, including any software applications When you want touse an editor, simply instruct the operating system to load the editor application and execute it

File management, program management, and user interaction are traditional features common to all

operating systems Linux, like all versions of Unix, adds two more features Linux is a multiuser and

multitasking system As it is a multitasking system, you can ask the system to perform several tasks at the

same time While one task is being done, you can work on another For example, you can edit a file whileanother file is being printed You do not have to wait for the other file to finish printing before you edit As it is

a multiuser system, several users can log in to the system at the same time, each interacting with the

system through his or her own terminal

As a version of Unix, Linux shares that system's flexibility, a flexibility stemming from Unix's researchorigins Developed by Ken Thompson at AT&T Bell Laboratories in the late 1960s and early 1970s, the Unixsystem incorporated many new developments in operating system design Originally, Unix was designed as

an operating system for researchers One major goal was to create a system that could support the

researchers' changing demands To do this, Thompson had to design a system that could deal with manydifferent kinds of tasks Flexibility became more important than hardware efficiency Like Unix, Linux has theadvantage of being able to deal with the variety of tasks any user may face The user is not confined tolimited and rigid interactions with the operating system Instead, the operating system is thought of asmaking a set of highly effective tools available to the user This user-oriented philosophy means you canconfigure and program the system to meet your specific needs With Linux, the operating system becomes

an operating environment

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History of Linux and Unix

As a version of Unix, the history of Linux naturally begins with Unix The story begins in the late 1960s, when

a concerted effort to develop new operating system techniques occurred In 1968, a consortium of

researchers from General Electric, AT&T Bell Laboratories, and the Massachusetts Institute of Technologycarried out a special operating system research project called MULTICS (the Multiplexed Information andComputing Service) MULTICS incorporated many new concepts in multitasking, file management, and userinteraction

Unix

In 1969, Ken Thompson, Dennis Ritchie, and the researchers at AT&T Bell Laboratories developed the Unixoperating system, incorporating many of the features of the MULTICS research project They tailored thesystem for the needs of a research environment, designing it to run on minicomputers From its inception,Unix was an affordable and efficient multiuser and multitasking operating system

The Unix system became popular at Bell Labs as more and more researchers started using the system In

1973, Dennis Ritchie collaborated with Ken Thompson to rewrite the programming code for the Unix system

in the C programming language Unix gradually grew from one person's tailored design to a standard softwareproduct distributed by many different vendors, such as Novell and IBM Initially, Unix was treated as aresearch product The first versions of Unix were distributed free to the computer science departments ofmany noted universities Throughout the 1970s, Bell Labs began issuing official versions of Unix and

licensing the systems to different users One of these users was the Computer Science department of theUniversity of California, Berkeley Berkeley added many new features to the system that later becamestandard In 1975, Berkeley released its own version of Unix, known by its distribution arm, Berkeley

Software Distribution (BSD) This BSD version of Unix became a major contender to the AT&T Bell Labsversion AT&T developed several research versions of Unix, and in 1983, it released the first commercialversion, called System 3 This was later followed by System V, which became a supported commercialsoftware product

At the same time, the BSD version of Unix was developing through several releases In the late 1970s, BSDUnix became the basis of a research project by the Department of Defense's Advanced Research ProjectsAgency (DARPA) As a result, in 1983, Berkeley released a powerful version of Unix called BSD release 4.2.This release included sophisticated file management as well as networking features based on Internetnetwork protocols-the same protocols now used for the Internet BSD release 4.2 was widely distributed andadopted by many vendors, such as Sun Microsystems

In the mid-1980s, two competing standards emerged, one based on the AT&T version of Unix and the otherbased on the BSD version AT&T's Unix System Laboratories developed System V release 4 Several othercompanies, such as IBM and Hewlett-Packard, established the Open Software Foundation (OSF) to createtheir own standard version of Unix Two commercial standard versions of Unix existed then-the OSF versionand System V release 4

Linux

Originally designed specifically for Intel-based personal computers, Linux started out as a personal project of

a computer science student named Linus Torvalds at the University of Helsinki At that time, students were

making use of a program called Minix, which highlighted different Unix features Minix was created by

Professor Andrew Tanenbaum and widely distributed over the Internet to students around the world Linus'sintention was to create an effective PC version of Unix for Minix users It was named Linux, and in 1991,Linus released version 0.11 Linux was widely distributed over the Internet, and in the following years, otherprogrammers refined and added to it, incorporating most of the applications and features now found instandard Unix systems All the major window managers have been ported to Linux Linux has all the

networking tools, such as FTP file transfer support, Web browsers, and the whole range of network servicessuch as e-mail, the domain name service, and dynamic host configuration, along with FTP, Web, and printservers It also has a full set of program development utilities, such as C++ compilers and debuggers Givenall its features, the Linux operating system remains small, stable, and fast In its simplest format, Linux can

run effectively on only 2MB of memory.

Although Linux has developed in the free and open environment of the Internet, it adheres to official Unixstandards Because of the proliferation of Unix versions in the previous decades, the Institute of Electricaland Electronics Engineers (IEEE) developed an independent Unix standard for the American NationalStandards Institute (ANSI) This new ANSI-standard Unix is called the Portable Operating System Interfacefor Computer Environments (POSIX) The standard defines how a Unix-like system needs to operate,specifying details such as system calls and interfaces POSIX defines a universal standard to which all Unixversions must adhere Most popular versions of Unix are now POSIX-compliant Linux was developed fromthe beginning according to the POSIX standard Linux also adheres to the Linux file system hierarchystandard (FHS), which specifies the location of files and directories in the Linux file structure See

www.pathname.com/fhs for more details

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Linux Overview

Like Unix, Linux can be generally divided into three major components: the kernel, the environment, and the

file structure The kernel is the core program that runs programs and manages hardware devices, such as disks and printers The environment provides an interface for the user It receives commands from the user and sends those commands to the kernel for execution The file structure organizes the way files are stored

on a storage device, such as a disk Files are organized into directories Each directory may contain anynumber of subdirectories, each holding files Together, the kernel, the environment, and the file structure formthe basic operating system structure With these three, you can run programs, manage files, and interactwith the system

An environment provides an interface between the kernel and the user It can be described as an interpreter.Such an interface interprets commands entered by the user and sends them to the kernel Linux providesseveral kinds of environments: desktops, window managers, and command line shells Each user on a Linuxsystem has his or her own user interface Users can tailor their environments to their own special needs,whether they be shells, window managers, or desktops In this sense, for the user, the operating systemfunctions more as an operating environment, which the user can control

In Linux, files are organized into directories, much as they are in Windows The entire Linux file system isone large interconnected set of directories, each containing files Some directories are standard directoriesreserved for system use You can create your own directories for your own files, as well as easily move filesfrom one directory to another You can even move entire directories, and share directories and files with otherusers on your system With Linux, you can also set permissions on directories and files, allowing others toaccess them or restricting access to yourself alone The directories of each user are, in fact, ultimatelyconnected to the directories of other users Directories are organized into a hierarchical tree structure,beginning with an initial root directory All other directories are ultimately derived from this first root directory With the K Desktop Environment (KDE) and the GNU Network Object Model Environment (GNOME), Linuxnow has a completely integrated GUI interface You can perform all your Linux operations entirely from eitherinterface KDE and GNOME are fully operational desktops supporting drag-and-drop operations, enabling you

to drag icons to your desktop and to set up your own menus on an Applications panel Both rely on anunderlying X Window System, which means as long as they are both installed on your system, applicationsfrom one can run on the other desktop The GNOME and KDE sites are particularly helpful for

documentation, news, and software you can download for those desktops Both desktops can run any XWindow System program, as well as any cursor-based program such as Emacs and Vi, which were

designed to work in a shell environment At the same time, a great many applications are written just forthose desktops and included with your distributions The K Desktop has a complete set of Internet tools,along with editors and graphic, multimedia, and system applications GNOME has slightly fewer

applications, but a great many are currently in the works Check their Web sites at www.gnome.org and

www.kde.org for new applications As new versions are released, they include new software

Note Ximian currently maintains an enhanced version of GNOME called Ximian

Desktop at www.ximian.com

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Open Source Software

Linux was developed as a cooperative open source effort over the Internet, so no company or institutioncontrols Linux Software developed for Linux reflects this background Development often takes place whenLinux users decide to work on a project together The software is posted at an Internet site, and any Linuxuser can then access the site and download the software Linux software development has always operated

in an Internet environment and is global in scope, enlisting programmers from around the world The onlything you need to start a Linux-based software project is a Web site

Most Linux software is developed as open source software This means that the source code for an

application is freely distributed along with the application Programmers over the Internet can make their owncontributions to a software package's development, modifying and correcting the source code Linux is anopen source operating system Its source code is included in all its distributions and is freely available onthe Internet Many major software development efforts are also open source projects, as are the KDE andGNOME desktops along with most of their applications The Netscape Communicator Web browser packagehas also become open source, with its source code freely available The OpenOffice office suite supported

by Sun is an open source project based on the StarOffice office suite (StarOffice is essentially Sun's

commercial version of OpenOffice) Many of the open source applications that run on Linux have located theirWeb sites at SourceForge (sourceforge.net), which is a hosting site designed specifically to support opensource projects You can find more information about the open source movement and recent developments

at Linuxcare (www.linuxcare.com) and at www.opensource.org

Open source software is protected by public licenses These prevent commercial companies from takingcontrol of open source software by adding a few modifications of their own, copyrighting those changes, andselling the software as their own product The most popular public license is the GNU General Public

License provided by the Free Software Foundation This is the license that Linux is distributed under TheGNU General Public License retains the copyright, freely licensing the software with the requirement that thesoftware and any modifications made to it always be freely available Other public licenses have also beencreated to support the demands of different kinds of open source projects The GNU Lesser General PublicLicense (LGPL) lets commercial applications use GNU licensed software libraries The QT Public License(QPL) lets open source developers use the QT libraries essential to the KDE desktop You can find a

complete listing at www.opensource.org

Linux is currently copyrighted under a GNU public license provided by the Free Software Foundation, and it

is often referred to as GNU software (see www.gnu.org) GNU software is distributed free, provided it isfreely distributed to others GNU software has proved both reliable and effective Many of the popular Linuxutilities, such as C compilers, shells, and editors, are GNU software applications Installed with your Linuxdistribution are the GNU C++ and Lisp compilers, Vi and Emacs editors, BASH and TCSH shells, as well asTex and Ghostscript document formatters In addition, there are many open source software projects that arelicensed under the GNU General Public License (GPL) Many of these software applications are available atdifferent Internet sites, and these are listed in Table 1-3 Chapter 4 and Chapter 29 describe in detail theprocess of downloading software applications from Internet sites and installing them on your system

Under the terms of the GNU General Public License, the original author retains the copyright, althoughanyone can modify the software and redistribute it, provided the source code is included, made public, andprovided free Also, no restriction exists on selling the software or giving it away free One distributor couldcharge for the software, while another one could provide it free of charge Major software companies are alsoproviding Linux versions of their most popular applications A Linux version of Sun's Java Software

Development Kit (SDK) is also available through www.blackdown.org Oracle provides a Linux version ofits Oracle database (At present, no plans seem in the works for Microsoft applications.)

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Linux Software

A great deal of Linux software is currently available from online sources You can download applications fordesktops, Internet servers, office suites, and programming packages, among others Several centralizedrepositories make it easy to locate an application and find information about it Of particular note are

sourceforge.net, freshmeat.net, rpmfind.net, and apps.kde.com

Software packages are distributed in compressed archives or in RPM packages RPM packages are those

archived using the Red Hat Package Manager Compressed archives have an extension such as tar.gz or

.tar.Z, whereas RPM packages have an rpm extension For Red Hat Fedora Core, you can update to the

latest Red Hat RPM package versions of software from their Fedora Yum repository using the Red HatUpdate Agent (see Chapter 4) For Red Hat Enterprise Linux, you can automatically download upgrades foryour system using the Red Hat Network described Also, any RPM package that you download directly,from whatever site, can be installed easily with the click of a button using the redhat-config-packages tool oneither the GNOME or KDE desktop You could also download the source version and compile it directly onyour system This has become a simple process, almost as simple as installing the compiled RPM versions.Red Hat also has a large number of mirror sites from which you can download their software packages forcurrent releases Most Linux Internet sites that provide extensive software archives have mirror sites, such

as www.kernel.org, that hold the new Linux kernels If you have trouble connecting to a main FTP site, tryone of its mirrors Red Hat also hosts open source projects at sources.redhat.com

The following tables list different sites for Linux software Repositories and archives for Linux software arelisted in Table 1-3, along with several specialized sites, such as those for commercial and game software.When downloading software packages, always check to see if versions are packaged for your particulardistribution For example, rpmfind.net, freshmeat.net, andsourceforge.net are also good places forlocating RPM packages

Table 1-3: Linux Software Archives, Repositories, and Links

sourceforge.net SourceForge, open source software development sites

for Linux applications and software repository

fedora.redhat.com/updates Red Hat Fedora Yum repository for Fedora updates,

with released and testing versions

www.tldp.org/links.html Linux links

linux.duke.edu/projects/yum Yellowdog Updater, Modified (Yum) update tool, with

listings of Yum repositories for updating Red HatFedora Core Linux

www.blackdown.org Web site for Linux Java

Table 1-3: Linux Software Archives, Repositories, and Links

apt-rpm.tuxfamily.org APT-RPM Red Hat repository for APT-enabled RPM

packages (see Chapter 4)

sources.redhat.com Open source software hosted by Red Hat

Linux Office and Database Software

Many professional-level databases and office suites are now available for Linux These include Oracle andIBM databases as well as the OpenOffice and K Office suites Table 1-4 lists sites for office suites anddatabases Many of these sites provide free personal versions of their software for Linux, and others areentirely free You can download from them directly and install on your Linux system

Table 1-4: Database and Office Software

www.software.ibm.com/data/db2/linux IBM DB2 database

www-3.ibm.com/software/data/informix/ Informix database

www.fship.com/free.html FlagShip (interface for xBase database files)

sourceforge.net/projects/gaby/ Gaby (GNOME desktop personal database)

of Internet clients and servers including mail, news, FTP, and Web, as well as proxy clients and servers.Sites for Internet server software available for Linux are listed in Table 1-5 Most of these are already included

on the Red Hat DVD-ROM included with this book; however, you can obtain news, documentation, andrecent releases directly from the server's Web sites

Table 1-5: Network Servers and Security

www.isc.org Internet Software Consortium: BIND, INN, and DHCPD

www.eudora.com/qpopper Qpopper POP3 mail server

www.netfilter.org IP Tables firewall

www.netfilter.org/ipchains IP Chains firewall

web.mit.edu/kerberos/www Kerberos network authentication protocol

www.openssh.com Open Secure Shell (free version of SSH)

Development Resources

Linux has always provided strong support for programming languages and tools All distributions include theGNU C and C++ compiler (gcc) with supporting tools such as make Most distributions come with fulldevelopment support for the KDE and GNOME desktops, letting you create your own GNOME and KDEapplications You can also download the Linux version of the Java Software Development Kit for creating Javaprograms Perl and Tcl/TK versions of Linux are also included with most distributions You can downloadcurrent versions from their Web sites Table 1-6 lists different sites of interest for Linux programming

Table 1-6: Linux Programming

www.gnu.org Linux compilers and tools (gcc)

dev.scriptics.com Tcl Developer Xchange, Tcl/Tk products

www.perl.com Perl Web site with Perl software

www.blackdown.org Sun's Java Software Development Kit for Linux

developer.gnome.org GNOME developer's Web site

www.openprojects.nu Open Projects Network

developer.kde.org Developer's library for KDE

www.linuxcare.org Linux open source software support

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Online Information Sources

Extensive online resources are available on almost any Linux topic The tables in this chapter list siteswhere you can obtain software, display documentation, and read articles on the latest developments ManyLinux Web sites provide news, articles, and information about Linux Several, such as

www.linuxjournal.com and www.linuxgazette.com, are based on popular Linux magazines Others,such as www.linux.com, www.linuxworld.com, and www.linux.org, operate as Web portals for Linux.Some specialize in a particular area, such as linuxheadquarters.com for guides on Linux software and

www.linuxgames.com for the latest games ported for Linux Currently, many Linux Web sites providenews, information, and articles on Linux developments, as well as documentation, software links, and otherresources These are listed in Table 1-7

Table 1-7: Linux Information and News Sites

www.tldp.org Web site for the Linux Documentation Project

www.linuxtoday.com Linux Today

www.linuxplanet.com LinuxPlanet

www.linuxfocus.org Linux Focus

www.linuxworld.com Linux World

www.linuxjournal.com Linux Journal

www.linuxgazette.com Linux Gazette

www.linuxmagazine.com Linux Magazine

www.li.org Linux International Web site

www.linux.org.uk Linux European Web site

linuxheadquarters.com Linux guides and software

www.opensource.org Open source information

Distribution FTP and Web sites, such as www.redhat.com and ftp.redhat.com, provide extensive Linuxdocumentation and software The www.gnome.org site holds software and documentation for the GNOMEdesktop, while apps.kde.com holds software and documentation for the KDE desktop The tables in thischapter list many of the available sites You can find other sites through resource pages that hold links toother Web sites- for example, the Linux Web site on the World Wide Web at www.tldp.org/links.html

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Documentation

Linux documentation has also been developed over the Internet Much of the documentation currently

available for Linux can be downloaded from Internet FTP sites A special Linux project called the LinuxDocumentation Project (LDP), headed by Matt Welsh, has developed a complete set of Linux manuals The

documentation is available at the LDP home site at www.tldp.org Linux documents provided by the LDPare listed in Table 1-8, along with their Internet sites

Table 1-8: Linux Documentation Project

Linux Installation and Getting Started Guide DVI, PostScript, LaTeX, PDF, and HTML

Linux User's Guide DVI, PostScript, HTML, LaTeX, and PDF

Linux System Administrator's Guide PostScript, PDF, LaTeX, and HTML

Linux Network Administrator's Guide DVI, PostScript, PDF, and HTML

Linux Programmer's Guide DVI, PostScript, PDF, LaTeX, and HTML

The Linux Kernel HTML, LaTeX, DVI, and PostScript

Linux Kernel Hacker's Guide DVI, PostScript, and HTML

Linux HOWTOs HTML, PostScript, SGML, and DVI

Most of the standard Linux software and documentation currently available is already included on your RedHat DVD-ROM HOW-TO documents are all accessible in HTML format, so you can view them easily withyour Web browser In the future, though, you may need to access Linux Internet sites directly for currentinformation and software

An extensive number of mirrors are maintained for the Linux Documentation Project You can link to any ofthem through a variety of sources, such as the LDP home site, www.tldp.org, and www.linuxjournal.org.The documentation includes a user's guide, an introduction, and administration guides These are available intext, PostScript, or Web page format Table 1-8 lists these guides You can also find briefer explanations, inwhat are referred to as HOW-TO documents

In addition to Web sites, Linux Usenet newsgroups are also available Through your Internet connection, youcan access Linux newsgroups to read the comments of other Linux users and to post messages of your

own Several Linux newsgroups exist, each beginning with comp.os.linux One of particular interest to the beginner is comp.os.linux.help, where you can post questions Table 1-9 lists some of the Usenet Linuxnewsgroups you can check out, particularly for posting questions

Table 1-9: Usenet Newsgroups

comp.os.linux.announce Announcements of Linux developments

comp.os.linux.development.apps For programmers developing Linux applications

comp.os.linux.development.system For programmers working on the Linux operating

system

Table 1-9: Usenet Newsgroups

comp.os.linux.hardware Linux hardware specifications

comp.os.linux.admin System administration questions

comp.os.linux.misc Special questions and issues

comp.os.linux.setup Installation problems

comp.os.linux.answers Answers to command problems

comp.os.linux.help Questions and answers for particular problems

comp.os.linux.networking Linux network questions and issues

linux.dev.group Numerous development newsgroups beginning

with linux.dev, such as linux.dev.admin and

linux.dev.doc

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Chapter 2: Installing Red Hat and Fedora Core Linux Overview

This chapter describes the installation procedure for Red Hat and Fedora Core Linux The installation

includes the Linux operating system, a great many Linux applications, and a complete set of networkservers The Red Hat and Fedora use the same Anaconda installation program, designed to be helpful andeasy to use, while at the same time efficient and brief, installing as many services and applications aspossible Detailed help panels explain each procedure, every step of the way Certain services, such as Webserver support, would ordinarily require specialized and often complex configuration operations Red Hat andFedora automatically install and provide default configurations for many of these services

Red Hat and Fedora provide detailed installation guides such as the Official Red Hat Linux x86 InstallationGuide (The Fedora version will be available soon.) It is available at the Red Hat Web site The guide consists

of Web pages you can view using any browser They include detailed figures and step-by-step descriptions.Checking this manual before you install is strongly recommended This chapter presents all the steps in theinstallation process, but it is not as detailed as the Red Hat and Fedora guides You can access

documentation at the Red Hat Web site at www.redhat.com Click Support and choose the link for yourversion of Red Hat

Installing Linux involves several steps First, you need to determine whether your computer meets the basichardware requirements These days, most Intel-based PC computers do Red Hat supports several methodsfor installing Linux You can install from a local source such as a CD-ROM or a hard disk, or from a network

or Internet source For a network or Internet source, Red Hat supports NFS, FTP, and HTTP installations.With FTP, you can install from an FTP site With HTTP, you can install from a Web site NFS enables you

to install over a local network For a local source, you can install from a CD-ROM or a hard disk The ROM included with this boot also operates as a boot CD-ROM In addition, you can start the installationprocess by booting from your DVD-ROM, from a DOS system, or from boot disks that can then use theDVD-ROM or hard disk repository Red Hat documentation covers each of these methods in detail Thischapter deals with the installation using the DVD-ROM provided with this book

DVD-Once the installation program begins, you simply follow the instructions, screen by screen Most of the time,you only need to make simple selections or provide yes and no answers The installation program

progresses through several phases First, you create Linux partitions on your hard drive, and then you installthe software packages After that, you can configure your network connection and then your X WindowSystem for graphical user interface support Both the X Window System and network configurations can beperformed independently at a later time

Once your system is installed, you are ready to start it and log in Normally, you will log in using a graphicallogin, selecting the desktop you want and entering your username and password Alternatively, you can log

in to a simple command line interface From the command line, you can then invoke a desktop such asGNOME or KDE that provides you with a full graphical user interface

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Hardware, Software, and Information Requirements

Before installing Linux, you must ensure that your computer meets certain minimum hardware requirements.You also need to have certain specific information ready concerning your monitor, video card, mouse, andCD-ROM drive All the requirements are presented in detail in the following sections Be sure to read themcarefully before you begin installation During the installation program, you need to provide responses thatreflect the configuration of your computer

Hardware Requirements

Listed here are the minimum hardware requirements for installing a standard installation of the Linux system

on an Intel-based PC:

 A 32-bit Intel-based personal computer At least an Intel or compatible 80386, 80486, or

Pentium-class microprocessor is required A 400 MHz Pentium is recommended for a graphicalinterface and 200 MHz for text

 A CD-ROM or DVD-ROM drive (if you are using the DVD-ROM included with this book, you willneed a DVD-ROM drive)

 A 3 1/2-inch floppy disk drive and floppy disk, if your PC is not capable of booting from CD-ROM

or DVD-ROM A 3 1/2-inch, DOS high-density (HD) floppy disk drive is used to create an installdisk (if you are installing from a floppy) If you install directly from a CD-ROM, you will not need it

A boot floppy can be created using either the Linux or Windows operating system

 Normally, at least 64MB RAM for text, and 192MB for graphical (Linux can run on as little as12MB RAM.) At least 2GB free hard disk space for a standard installation, including applications(keep in mind that Linux can run on far less on a minimum installation, as little as 100MB and16MB swap); 3GB to 6GB or more is recommended for a full installation (all applications) Youneed about 5GB to install all the software packages on most distribution CD-ROMs The standardinstallation of basic software packages normally takes 3GB, plus 64MB to 512MB for swap

space, depending on the amount of RAM memory you have If you have less than 1GB of harddisk space, you can elect to perform a minimum install, installing only the Linux kernel withoutmost of the applications You could later install the applications you want, one at a time, usingthe redhat-config-packages tool accessible on the System Settings window

 Hard disk requirements depend on the kind of installation you want:

o Custom Installation (minimum): 520MB

o Server (minimum): 870MB

o Personal Desktop: 1.9GB

o Workstation: 2.4GB

o Custom Installation (everything): 5.3GB

Hard Drive Configuration

These days, Linux is usually run on its own hard drive, though it can also be run in a different partition on ahard drive that also contains a separate partition for a different operating system such as Windows

If you want to install Linux and Windows on the same hard drive, you can use a partition managementsoftware package, such as fdisk, fips, Parted, or Partition Magic, to set up your Windows and Linux

partitions If you have already installed Windows on your hard drive and configured it to take up the entirehard drive, you would resize its partition to free up unused space The freed space could then be used for aLinux partition See the Red Hat Linux x86 Installation Guide for more details

Information Requirements

Part of adapting a powerful operating system like Linux to the PC entails making the most efficient use of thecomputer hardware at hand In almost all configurations, your Linux installation process will automaticallydetect and configure your hardware components Sometimes, however, particularly with older or very recenthardware, your installer may not be able to correctly identify a component If you have such components,such as a new model monitor or video card, you should first check their manuals and take note of certainconfiguration settings

You will also need to determine how you want to use hardware resources, for example, how much of yourhard disk you want to devote to Linux.

CD-ROM, Hard Disk, and Mouse Information

For some older SCSI CD-ROM drives, you need the manufacturer's name and model

Decide how much of your hard drive (in megabytes) you want to dedicate to your Linux system If you aresharing with Windows, decide how much you want for Windows and how much for Linux

Decide how much space you want for your swap partition Your swap partition should be about the samesize as your RAM memory, but it can work with as little as 64MB For system's with smaller RAM

configurations, the swap disk should be twice the size of the RAM The size of the swap partition was

expanded with the 2.4 kernel Your swap partition is used by Linux as an extension of your computer's RAM Find the make and model of the mouse you are using Linux supports serial, USB, PS/2, IMPS/2, and busmice Most mice are supported, including Microsoft, Logitech, and Mouse Systems

Know what time zone you are in and to what time zone your hardware clock is set This can be either

Greenwich Mean Time (GMT), also called Universal Coordinated Time (UCT), or your local time zone

Know which kind of port your mouse is using, such as PS/2, USB, or serial port Most systems now use aPS/2 port For a serial port mouse, you will need to know which port it is connected to: COM1, COM2, ornone

Video and Monitor Information

Although most monitors and video cards are automatically configured during installation, you might still need

to provide the manufacturer's make and model, in case the detection is wrong Find out the manufacturer foryour monitor and its model, such as Iiyama VisionMaster or Hitachi CM828 Do the same for your videocard-for example, Matrox Millennium G400 or ATI Radeon (you can find a complete list of supported cards at

www.xfree86.org) This should be listed on the manuals or registration information provided with yourcomputer For some of the most recent monitors and video cards, and some older, uncommon ones, youmay need to provide certain hardware specifications Having this information on hand, if possible, is

advisable At the end of the installation process, you are presented with lists of video cards and monitorsfrom which to choose your own These lists are extensive If your card or monitor is not on the list, however,you need to provide certain hardware information about them If the configuration should fail, you can always

do it later using the X Window System configuration tool, redhat-config-xfree86 Of particular importance isthe monitor information, including the vertical and horizontal refresh rates

Video Card Information You should also know the following video card information, though the chipset is

most likely not necessary Your card will be automatically detected, but you should make sure the selection

is accurate:

 What is the make and model of your video card?

 What chipset does your video card use?

 How much memory is on your video card?

Monitor Information What are the manufacturer and model of your monitor? Linux supports an extensive

list of monitors, covering almost all current ones Your monitor will be automatically detected and selected Ifthe detection is wrong, you can find the correct one and select it from the list If, however, your monitor is not

on this list, you may need to provide the following information Be sure this information is correct If you enter

a horizontal or vertical refresh rate that is too high, you can seriously damage older monitors Newer oneswill just shut down You can choose a generic profile, or you can enter information for a custom profile To dothat, you need the following information:

 The horizontal refresh rate in Hz

 The vertical refresh rate in Hz

Network Configuration Information

If your ISP service or network uses DHCP, you will most likely not have to provide any configuration

information Most local networks, cable connections, and DSL connections now use DHCP to automaticallyconfigure hosts Network information is provided automatically by a DHCP server During the installationprocess, you will be given the option of either automatically configuring your network connection (DHCP) orentering the network information manually.

If you need to configure your network connection, you can also put configuration off until a later time and usenetwork configuration utilities provided by your distribution to perform network configuration All you need to

do during installation is provide a hostname

If you decide to manually configure your network connection, you will need the following information, usuallyobtainable from your network administrator:

 The name for your computer (this is called a hostname) Your computer will be identified by thisname on the Internet Do not use "localhost," which is reserved for special use by your system

 The Internet Protocol (IP) address assigned to your machine Every host on the Internet is

assigned an IP address

 Your network IP address This address is usually similar to the IP address, but with one or morezeros at the end

 The netmask This is usually 255.255.255.0 for class C IP addresses If, however, you are part of

a large network, check with your network administrator

 The broadcast address for your network, if available Usually, your broadcast address is the same

as your IP address with the number 255 used for the last number

 The gateway IP address for your network The gateway connects your network to a larger one likethe Internet

 The IP address of any name servers your network uses

 The NIS domain and IP address if your network uses an NIS server

 The Samba server if your network is connected to a Windows network

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Creating the Boot Disks

If you are installing Red Hat using the DVD-ROM included with this book, or you are using a set of CD-ROMdiscs to install Linux, and if your computer is fairly new, it most likely has the ability to boot from yourCD-ROM This book's DVD-ROM operates as a bootable CD-ROM In this case, you can just use yourCD-ROM or this book's DVD-ROM as your installation disk and skip this section (You may need to

configure your BIOS to boot from your CD-ROM.) If you cannot boot from your CD-ROM or DVD-ROM, youwill have to create floppy install disks as described here

Note If you are installing from the Red Hat DVD-ROM included with this book, you

will need a DVD-ROM drive on your computer to read the DVD-ROM disc

The DVD-ROM included with this book has been configured to be bootable,

functioning like a boot CD-ROM If your system supports bootable

CD-ROMs, then it will boot from this DVD-ROM, letting you install your Red

Hat system from the DVD-ROM directly

On Windows, to use the rawritewin program to create a floppy install disk, first insert the CD-ROM intoyour CD-ROM drive (if you are installing from the DVD-ROM disc included with this book, you would use yourDVD-ROM drive instead) Change to your CD-ROM drive Once you have changed to the CD-ROM drive, you

then need to change to the \dosutils directory The rawritewin command is in the dosutils\rawritewin

directory Just double-click it to start it It is very easy to create a boot disk with rawritewin Just run it

from Windows and use its interface to select the floppy disk image bootdsk.img, with support disks

pcmiadd.img, and drvnet.img The image file you want for a CD-ROM or DVD-ROM installation is the boot.iso file, also located on your CD-ROM in the images directory, images/ Be sure that your floppy drive

is correctly listed The default will be A: Then place a blank floppy in your floppy drive and click Write.For rawrite, which you have to use on MS-DOS, at your DOS prompt, change to your CD-ROM drive,using whatever the letter for that drive may be For example, if your CD-ROM drive is the E drive, just type e:

and press ENTER Once you have changed to the CD-ROM drive, you then need to change to the \images directory On the DVD-ROM included with this book, the install disk image is bootdsk.img with support disks for network and notebooks, drvnet.img and pcmiadd.img The rawrite command has to be run at

a DOS prompt Enter the full path for the rawrite command, including the CD-ROM or DVD-ROM driveletter, such as e:\dosutils\rawrite The rawrite command first prompts you for the name of thedisk image file you want to copy Enter the full name of the install image file The command then asks you toenter the letter of the floppy drive where you put your floppy disk On many systems, this is the A drive

E:\> cd images

E:\col\launch\floppy > e:\dosutils\rawrite

Enter source file name: bootdsk.img

Enter destination drive (A or B) and press ENTER: a

Press ENTER to confirm that you have a blank floppy disk in the drive rawrite will then copy the imagefile to your floppy disk, creating your install disk When it finishes, remove your disk from the floppy drive

This is the disk that the installation procedure (described later) refers to as the install diskette If you need to

create a network support disk, use drvnet.img For PCMCIA support, use pcmciadd.img.

To create floppy disks on a Linux or Unix system, you use the dd command and specify the boot image file

to use along with the name of the floppy device and the size of the floppy disk You will first need to mountthe CD-ROM, then change to its mount directory On most Linux systems, the first floppy disk drive is at

/dev/fd0 and its size is usually 1400 for a 1.4 floppy disk With the if option, you specify the image file touse, the of option indicates the floppy device name, and the bs option specifies the block size

dd if=images/bootdsk.img of=dev/fd0 bs=1440

If your system contains very old CD-ROM drives, SCSI adapters, or network cards, you will likely have tocreate a driver disk Your Red Hat CD-ROM/DVD-ROM provides a floppy disk image called

/images/drvnet.img that contains drivers for many uncommon devices, particularly those not using the PCI

bus If you have devices supported by theses drivers, you should create a driver disk using drvnet.img and

the rawrite or dd commands, just as you did for an install floppy During installation, the devices will bedetected and you will prompted to enter a driver disk Drivers are needed only for devices required forinstallation, like CD-ROMs, SCSI adapters, and network cards In the case of very new devices, you mayneed to provide your own drivers on a driver disk.

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Installing Linux

Installing Linux involves several processes, beginning with creating Linux partitions, and then loading theLinux software, configuring your X Window System interface, installing the Linux boot loader (GRUB or LILO)that will boot your system, and creating new user accounts The installation program used on Red Hat is ascreen-based program that takes you through all these processes, step by step, as one continuous

procedure You can use either your mouse or the keyboard to make selections When you finish with ascreen, click the Next button at the bottom to move to the next screen If you need to move back to theprevious screen, click Back You can also use TAB, the arrow keys, SPACEBAR, and ENTER to makeselections The installation screens will display a help panel explaining each step in detail You have little to

do other than make selections and choose options Some screens provide a list of options from which youmake a selection In a few cases, you are asked for information you should already have if you followed thesteps earlier in this chapter Hardware components will be automatically detected and displayed as youprogress During installation, you will be able to perform administrative tasks such as configuring yournetwork connections, creating users, and setting the time Keep in mind that such administrative tasks canalso be performed after installation You are now ready to begin installation The steps for each part of theprocedure are delineated in the following sections This should not take more than an hour

Toward the end of the installation, you will be asked to create a boot disk Be sure to make one The bootdisk will contain specific configuration information about your systems Should anything go wrong with yourboot loader, you will still be able to boot Linux using the boot disk

Starting the Installation Program

You can start the installation using one of several methods If your computer can boot from the CD-ROM,you can start the installation directly from the CD-ROM or the DVD-ROM included with this book Just placethe CD-ROM in the CD-ROM drive, or the book's DVD-ROM in the DVD drive, before you start your

computer After you turn on your computer, the installation program will start up

Note To boot from a CD-ROM or DVD-ROM, you may first have to change the

boot sequence setting in your computer's BIOS so that the computer will try

to boot first from the CD-ROM This requires some technical ability and

knowledge of how to set your motherboard's BIOS configuration

If you have a DOS or Windows system installed on your hard drive, you can use the autoboot.bat

command in the dosutils directory to start the installation, as shown here You have to execute this

command from a DOS system or a Windows DOS window

e:\dosutils\autoboot.bat

If neither of these options is feasible for you, you can use the install floppy disk (see the preceding section

on creating a boot disk) This is perhaps the most fail-safe method of installing Linux Insert the Linux installdisk into your floppy drive and reboot your computer

The installation program will start, presenting you with an Introduction screen After a moment, the followingprompt will appear at the bottom of your screen:

boot:

Press ENTER (If necessary, you can enter boot parameters as described in the installation manual.)Configuration information will fill your screen as the installation program attempts to detect your hardwarecomponents automatically

Your system then detects your hardware, providing any configuration specifications that may be needed Forexample, if you have an IDE CD-Write drive, it will be configured automatically as a SCSI drive so that CDwriting software can make use of it (see Chapter 31) If you are installing from a floppy disk, it will detectyour CD-ROM If for some reason it cannot do so, your system will ask you to select your CD-ROM from alist If you still have difficulty, you may have to specify the CD-ROM at the boot prompt

Boot: linux hdx=cdrom