Red Hat Linux is the most popular distribution of Linux currently in use. Red Hat
Linux has shown itself to be a robust, reliable operating system that can run on a
variety of hardware, from personal computers to large mainframes. Linux in general,
and Red Hat Linux in particular, is a very powerful operating system that can be used
at the enterprise level as a full-fledged server, as well as at the workstation level for
typical user applications. For those of us dissatisfied with the reliability of other commercially
available operating systems, Red Hat Linux is a pleasant alternative.
This book is divided into five parts. Each part covers a specific area of functionality
in a typical Red Hat Linux system.
Part I—Red Hat Linux System and Network
Administration Defined
This part describes the duties of a system administrator. Chapter 1 explains some of
the more common tasks, such as installing servers and application software,
managing user accounts, and backing up and restoring files. Many more topics are
covered in this chapter. Chapter 2 details the steps involved in planning and building
a network and planning for security and disaster recovery. Chapter 3 takes you
through the steps required to install Red Hat Linux on a local system as well as on
a remote system. Chapter 4 gives an explanation of the Red Hat Linux file system
and storage devices. Chapter 5, the last chapter in Part I, lists the system and
network configuration files and their uses.
Part II—Red Hat Linux Network Services
This part of the book is where you learn about the networking services available in
Red Hat Linux. Chapter 6 gives an explanation of the TCP/IP protocol suite and
how to configure it on your system. Chapter 7 tells how to configure the Network
File System (NFS) for sharing files with other Linux or Unix computers on your
network. Chapter 8 provides a description of the Network Information System (NIS)
as well as configuration instructions. If you have computers running Microsoft
operating systems, Chapter 9 is where you find instructions for connecting your
Red Hat Linux network to the Windows network. The final chapter in this part,
Chapter 10, tells you how to connect your Red Hat Linux network to computers
running the Apple operating system.
Part III—Red Hat Linux Internet Services
Internet services are somewhat different from network services used on an internal
network. Chapter 11 begins this part by explaining Internet services, and includes a
discussion of the xinetd and TCP wrappers configuration files.A fundamental part of
using the Internet is the ability to enter a domain name and have it converted into
an IP number that is the actual address of a computer. The name-to-number conversion
is done by the Domain Name System (DNS), which is covered in Chapter 12.
Chapter 13 describes the File Transfer Protocol (FTP) and gives installation and configuration
instructions. Sending and receiving e-mail has become so common that
it’s hard to remember the time before we had it. Chapter 14 explains mail services
and its configuration. Last, but not least, you find an explanation of setting up a
Web server. Chapter 15 covers Apache, one of the most popular Web servers in use.
Part IV—Red Hat Linux System Maintenance
The goal of this part of the book is to provide a fundamental understanding of the
tasks required to maintain your system and ensure that it runs optimally. Chapter 16
explains the Red Hat Network, a service available from Red Hat that you can use to
keep your system current. You can register your systems with Red Hat and then
receive notifications of updated or new software that can be installed. Chapter 17
discusses upgrading and customizing the kernel for your specific needs. Chapter 18
tells you how to use the command line to perform all of your system administrative
tasks. If you want to use scripts to automate some of your work, Chapter 19 is where
you find out how to do it. Chapter 20 deals with monitoring the performance of your
system. Creating users and groups is a basic part of system maintenance, and
Chapter 21 describes this process. Chapter 22 details the steps necessary to back up
your file system and use the backups to restore your system. The final chapter in this
part, Chapter 23, gives instructions on installing and upgrading software packages.
Part V—Security and Problem Solving
A critical area of concern for system administrators is maintaining a secure system.
Most of the chapters in this part deal with security, beginning with Chapter 24,
which covers security basics. Chapter 25 addresses local, or host-based, security. In
Chapter 26 you find an explanation of firewalls and Internet security and the risks
you may encounter from outside connections. Chapter 27 looks at ways to monitor
a Red Hat Linux system for attempted, potential, and actual security compromises
using the tools available in a standard Red Hat Linux installation. The last chapter
in this part, Chapter 28, lists problems you may encounter during normal operation
of your system and the steps to take to solve the problems discussed.
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