... Defined
CHAPTER 1
Duties of the System Administrator
CHAPTER 2
Planning the Network
CHAPTER 3
Installing RedHat Linux
CHAPTER 4
Red HatLinux File System
CHAPTER 5
Red HatSystem Configuration Files
Part
I
b3632-X ... of other operating systems. Now, RedHat has employed innovations
that extend these duties even for the experienced Linux user. In this chapter, we
look at those requirements.
The LinuxSystem ... network,
installing RedHat Linux, and working
with the RedHatLinux file system and
configuration files.
b3632-X PtO1.F 2/21/02 8:33 AM Page 2
(Because of its built-in security features, Linux may not...
... Cisco DSL modem 96
Red HatLinux9 For Dummies
xiv
Chapter 4
Getting RedHat Linux
In This Chapter
ᮣ Checking out the RedHatLinux file system
ᮣ Booting RedHat Linux
ᮣ Comprehending logins ... 90
The DSL Option 91
Facing DSL configuration woes head-on 92
Finding a DSL provider 93
Connecting your Cisco modem to your
Red HatLinux computer 94
Configuring the Cisco DSL modem 96
Red Hat ... 4-7.
Figure 4-7:
The Red
Hat User
Manager
administra-
tion tool.
65
Chapter 4: Getting RedHat Linux
Red Hat
đ
Linux
đ
9 For Dummies
đ
Published by
Wiley Publishing, Inc.
90 9 Third Avenue
New...
... Beginning RedHatLinux9 1
Introduction 4
Who Is This Book For? 4
What You Need to Use This Book 4
What Is Linux? 5
Linus Torvalds and the Birth of Linux 5
Why Choose Linux? 6
What Is RedHatLinux ... Chapter 2: RedHatLinux9 Basics
Overview
Now that you have installed RedHatLinux on your machine, you can start to familiarize yourself with your
new operating system. RedHatLinux9 sports a ... matured
alongside the basic Linuxoperatingsystem itself.
The latest RedHatLinux release − version9 − is a perfect example of this innovation. While it's available for
free download, RedHat also sells...
... your Red
HatLinux system. It's been specially written for RedHatLinux 9, though you will also find it a very useful
guide if you're planning to use its slightly older brother, RedHat ... http://hardware.redhat.com, for more
on hardware compatibility.)
ã
A copy of RedHatLinux9 included with this book.ã
Other Alternatives
There are other ways to obtain the RedHatLinux9 distribution. ... Security? 395
Identifying What Is Valuable 395
Potential Threats 396
Countering the Threats 397
Hardware 397
Physical Security of the Hardware 397
Hardware Failure 398
Local Security 399
(Mis)using...
... expect in a Linuxsystem and the type of files that they are supposed to contain. That said,
Red Hat still has some distribution−specific directories that you won't find in other Linux distributions.
You ... chapter, we looked at the various steps of the installation of the RedHatLinux9operating system.
We started by noting that the installation process requires various pieces of background information ... the system in the directory tree given below:
The File System
51
We can see from the figure above that the only Ethernet controller in this list is a Realtek
81 39/ 8139C/8139C+ model. Note that...
... version of the RedHat packages can be downloaded from www.RedHat.com
Upgrading Packages
118
Chapter 5: Everyday Applications
Overview
You've installed your RedHatLinux9operating system; ... tools that RedHatLinux9 makes available for you to do this.
Web Browsers
Obviously, the most common and popular way of accessing the Internet is by using a web browser. Red Hat
Linux9 comes ... chapter we'll survey some of the many applications available within the RedHatLinux9 distribution.
Red HatLinux9 comes with a bewildering array of applications, and to cover them all in...
... another (virtual) operatingsystem within Linux, and hence you can run executables that are native
to that operating system.
Hence, we can (for example) run an emulator application that simulates ... image.
System Applications
There are numerous other applications available and installed with RedHat9. Half the fun of a new operating
system is exploring all these applications. There is much that ... that folder.
News
Feeds
Allows you to add links to news feeds. The News Feeds tab contains a number of predefined news
feeds to choose from − the RedHatLinux Update Watch
(https://rhn.redhat.com/rpc/recent−errata.pxt)...
... 0.000−61 49. 882 megabytes
Disk label type: msdos
Minor Start End Type File system Flags
1 0.031 101 .97 5 primary ext3 boot
2 101 .97 5 499 6.7 79 primary ext3
3 5773.3 59 61 49. 882 primary linux swap
The ... ext3 boot
2 101 .97 5 499 6.7 79 primary ext3
4 499 6.780 5773.3 59 primary ext2
3 5773.3 59 61 49. 882 primary linux swap
7.
We now proceed to create a new partition, using the space that we took from Partition ... file system on Linux is the ext (or extended) file system. A second version of this file system
was called ext2; RedHatLinux9 supports the latest version, ext3. Usually when a system is shut...
... kapils:!!$1$68Q7Ci4g$CqbN8rdCBw4GmxDlouQ2q/:12100:0 :99 999 :7:::
deepakt:$1$sUejrHGF$I3cSo2TRmKIbN55wfLgfB1:12100:0 :99 999 :7:::
markm:$1$3afRsVjz$mg9zGakhspD.fcpDwx4wv0:12100:0 :99 999 :7:::
Now the markm account has a password, and is fully ... kapils:!!$1$68Q7Ci4g$CqbN8rdCBw4GmxDlouQ2q/:12100:0 :99 999 :7:::
deepakt:$1$sUejrBGF$I3cSo2TRmKIbN55wfLgfB1:12100:0 :99 999 :7:::
markm:!!:12100:0 :99 999 :7:::
The ! ! in the second field means that the account is disabled. ... authentication tokens updated successfully.
3.
Now refresh your view of the /etc/shadow, to see what has changed:
eziodm:$l$W/RgbXrI$OP9t9IyVmQyvPfxNLUFwQ1:12100:0 :99 999 :7:::
kapils:!!$1$68Q7Ci4g$CqbN8rdCBw4GmxDlouQ2q/:12100:0 :99 999 :7:::
...
... to gain FTP access via a system user account, you'll be refused:
$ ftp 192 .168.0 .99
Connected to 192 .168.0 .99 ( 192 .168.0 .99 ).
220 (vsFTPd 1.1.3)
Name ( 192 .168.0 .99 :none): eziodm
530 This ... is installed by default with RedHatLinux9.
ã
wu−ftpd is a highly configurable and full featured FTP daemon, which was popular in earlier
versions of RedHatLinux but has since given way ... FTP
server, web server, or mail server:
Server Value
Operating systemRedHatLinux9
IP address 192 .168.0 .99
Netmask 255.255.255.0
Hostname linux4 biz
The laptop is a simple client machine, designed...
... this file:
redhat−config−xfree86 (Applications | System Settings | Display)ã
redhatconfigkeyboard (Applications | System Settings | Keyboard)ã
redhatconfigmouse (Applications | System Settings ... about versions: if you are using RedHatLinux 9, then your kernel is probably v2.4.20−2.48. In
the Linux kernel's versioning scheme, the first digit (2 in this case) represents the major version ... (/home) to /data/backup/hda2−20020112 9. dmp
Here are a few examples of sequences of dump levels that you may choose to follow:
[0] 9 8 7 6 [5]
[0] 9999 [9]
[0] 3 [2] 5 [4] [5]
You would need...
... security of your RedHatLinux system.
Identifying What Is Valuable
The first step in planning the security of your RedHatLinuxsystem is to identify what you have on that
system that is of value ... of your RedHat system, allowing you to spot security
breaches and other potential problems.
System Logs
/var/log
The RedHatLinuxsystem maintains several log files that record system activity. ... pet), or anything generated in a systematic way. Include punctuation and other symbols, and make use of
the fact that RedHatLinux9 uses MD5 password hashes that allow passwords to be up to...