... covered is the RedHat Network, a subscription service
available with RedHat Enterprise Linux that you can use to keep your system
current. You can register your systems with RedHat and then ... mainframes. Linux in general, Fedora Core 4 and
Red Hat Enterprise Linux in particular, are very powerful operating systems
that can be used at the enterprise level as a full- fledged server. Linux ... We
want to emphasize that this book is useful for users of Fedora Core, the open
source community–based Linux project supported by Red Hat, as well as users
of RedHat Enterprise Linux.
Preface
ix
02_599496...
... the RedHatLinux security mailing list? (Find it at
www.redhat.com/mailing-lists /linux- security/index.html.)
Have you established a procedure that makes sure that every security update
is downloaded ... whatever came on the com-
puter, assuming that things came properly configured from the factory. The
user or enterprise that decides on Linux has decided, also, to assume the con-
trol that Linux ... Luckily for you, RedHat has created the Red
Hat Network, a program intended to help keep your system updated with the
latest security updates.
CROSS-REFERENCE Learn how to use the RedHat Network...
... RedHat boot disk starts your PC and the RedHatLinux installation
program. After you install RedHat Linux, you no longer need the Red Hat
boot disk (except when you want to reinstall RedHat ... which operating
systems to boot.
In the center of the Boot Loader screen is a box that shows any operating
systems, if there are any, that were detected on your system. The Red Hat
Linuxsystem ... reinstall RedHatLinux from the
CD-ROMs).
The RedHat boot disk contains an initial version of the RedHat Linux
installation program that you use to start RedHat Enterprise Linux, prepare
the...
... the default operating system. The
default operatingsystem is the one with a check mark in the Default column
in Figure 3-10. In this case, RedHatLinux is the default operating system.
All ... PC. Atable then lists
the Linux partition and any other partitions that may contain another operating
system. If your system has a Linux partition and a DOS partition (that actually
has Windows ... or
deselect that package group.
TIP In an actual RedHatLinux installation, you install exactly those package
groups that you need. Each package group requires specific packages to run.
The RedHat installation...
... cor-
rect permissions.
chmod u+w isolinux/*
7. Create the ISO image file with this command. (The command should be
entered on one line.)
mkisofs -o file .iso -b isolinux.bin -c boot.cat -no-emul-boot ... created to the
/isolinux directory on your hard drive at the location where you cre-
ated it.
cp /root/ks.cfg /tempdir/isolinux/
5. Change to the temporary directory, cd /root/tempdir, that you
created.
6. ... the system volume, use the utility here.
■■ System Settings — This menu item contains Enterprise Linux system
administration utilities and some GNOME configuration utilities as well.
■■ System...
... at
the file system structure are the file system commands, essential to proper file
system management. In addition to the native Linux file system, Fedora Core
and RedHat Enterprise Linux support ... Configuration
All RedHat systems, whether Fedora Core or Enterprise Linux, use a similar
procedure for starting up the operating system. As the system boots, the oper-
ating system loads programs ... typical Fedora and
Red Hat Enterprise Linux system.
142 Chapter 7
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141
The File System
Explained
IN THIS CHAPTER
■■ Understanding the File System Structure
■■...
... Enterprise Linux provide
support for many file systems. Linux supports those from other operating sys-
tems, remote file systems, memory file systems, CD-ROM file systems, virtual
file systems, ... handy since it reduces system administration
time. This is a fast file system, and now you can read and write to and from it
with your RedHatLinux machine.
Nonstandard Linux File Systems
Support ... more important system
configuration files on your RedHat system.
Systemwide Shell Configuration Scripts
These files determine the default environment settings of system shells and
what functions...
... directory should be edited by hand. For more informa-
tion on RedHat Network, see the RedHat Network Web site at https://
rhn.redhat.com.
Examining the Network Configuration Files
This section ... /etc/sysconfig
directory
Files to Change When Setting Up
a System or Moving the System
Whenever you set up a system to work on a new network, either because you’ve
just installed RedHat or you’re moving the machine from ... use it. APM is a monitoring daemon that works with power man-
agement code within the Linux kernel. It can alert you to a low battery if you
are using RedHatLinux on a laptop, among other things.
Figure...
... X Window System 211
file that was created during system installation. A description of the section of
the file follows the file.
# XFree86 4 configuration created by redhat-config-xfree86
Section ... printer attached to a different UNIX sys-
tem that can be accessed over a TCP/IP network (for example, a printer
attached to another RedHatLinuxsystem on your network). If you
choose this type ... Window System 209
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205
This chapter introduces you to the X Window system that is used to provide a
graphical user interface (GUI) to the operating system. ...
... and RedHat Enterprise Linux systems, the /etc/exports
file is the main NFS configuration file. It lists the file systems the server
exports, the systems permitted to mount the exported file systems, ... in RedHat Linux) .
rw Exports the file system read-write, permitting operations
that change the file system.
secure Requires client requests to originate from a secure
(privileged) port, that ... exported file system. The
Linux security model ordinarily grants root full access to the file systems on a
host. However, in an NFS environment, exported file systems are shared
resources that are...
... unique
name that refers to any group of systems that use the same NIS maps. NIS
domains function as system management tools providing a convenient method
to organize groups of systems that need to ... well-run system, IP
addresses can change, whereas a hostname won’t. If DNS is properly
configured and maintained, the hostname will always point to the proper
system regardless of what that system s ... export.
While we’re somewhat embarrassed to be running such an old version of Red
Hat, we’re also quite pleased to report that it has been running so well for so
long that we forgot just how old...
... Novell Networks
With RedHat Enterprise Linux, you can easily configure your system to con-
nect to Novell Netware servers. In this section, you learn how to configure
your RedHatsystem to be a Novell ... also able to use the printers configured with the Red Hat
system.
Connecting to a Samba Client
In this section, you learn how to connect your system to other systems running
the SMB protocol. Connecting ... about a Linux program called Samba, which emulates the SMB
protocol and can be used to connect Linux networks to Windows networks.
You installed and configured Samba on a RedHat Enterprise Linux...
... for your needs.
In addition, the versions of PostgreSQL and MySQL that ship in Fedora Core and
Red Hat Enterprise Linux lag somewhat behind the current stable versions of
those products. At the ... and to allow a remote user full control over that system. More suc-
cinctly, VPN makes a remote system part of the main network; VNC gives a
remote user control over one system on the main network.
For ... example, the following
mysqladmin command shows the server version:
$ mysqladmin version
mysqladmin Ver 8.23 Distrib 3.23.58, for redhat -linux- gnu on i386
Copyright (C) 2000 MySQL AB & MySQL...
... cut by a backhoe,
say), access to that time server will be impaired. NTP is engineered to select an
alternative server, but if all your servers use that same severed backbone,
you’re hosed. So, ... modify your system s firewall
setup (you are running a firewall, right?).
1. To start the Security Level Configuration tool, select RedHat ➪ System
Settings ➪ Security Level or type system- config-securitylevel
at ... network interface
eth0 (-i eth0) that are destined for port 80 ( dport 80). The modification
that occurs is that packets going to port 80 are redirected (-j REDIRECT) to port
3128 ( to-port 3128),...
... and Linux system
security, see Chapter 34.
iptables is Fedora’s and RedHat s built-in IP firewall administration tool.
Using iptables enables you to run a personal firewall to protect your Linux
machine. ... Linux machines
versatile workhorses that can fulfill many different functions in a company’s
network. This chapter covers the wide range of common services that come
standard with every RedHat ... important program that has been around for several years.
It incorporates new features that have been desired by system administrators
for a few years now.
xinetd starts at system boot time, and...