source: prologue/common/audience.xml@ d7b4b72

Last change on this file since d7b4b72 was bf8c11f, checked in by Jim Gifford <clfs@…>, 19 years ago

r627@server (orig r625): jim | 2005-10-31 12:59:34 -0800
Import of Cross-LFS Book

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8<sect1 id="pre-audience">
9 <?dbhtml filename="audience.html"?>
10
11 <title>Audience</title>
12
13 <para>There are many reasons why somebody would want to read this book.
14 The principal reason is to install a Linux system from the
15 source code. A question many people raise is, <quote>why go through all
16 the hassle of manually building a Linux system from scratch when you
17 can just download and install an existing one?</quote> That is a good
18 question and is the impetus for this section of the book.</para>
19
20 <para>One important reason for LFS's existence is to help people learn
21 how a Linux system works from the inside out. Building an LFS system
22 helps demonstrate what makes Linux tick, and how things work together
23 and depend on each other. One of the best things that this learning
24 experience provides is the ability to customize Linux to your own
25 tastes and needs.</para>
26
27 <para>A key benefit of LFS is that it allows users to have more control
28 over the system without relying on someone else's Linux implementation.
29 With LFS, <emphasis>you</emphasis> are in the driver's seat and dictate
30 every aspect of the system, such as the directory layout and bootscript
31 setup. You also dictate where, why, and how programs are installed.</para>
32
33 <para>Another benefit of LFS is the ability to create a very compact
34 Linux system. When installing a regular distribution, one is often
35 forced to include several programs which are probably never used. These
36 programs waste disk space, or worse, CPU cycles. It is not
37 difficult to build an LFS system of less than 100 megabytes (MB), which
38 is substantially smaller than the majority of existing
39 installations. Does this still sound like a lot of space? A few of us
40 have been working on creating a very small embedded LFS system. We
41 successfully built a system that was specialized to run the Apache web
42 server with approximately 8MB of disk space used. Further stripping
43 could bring this down to 5 MB or less. Try that with a regular
44 distribution! This is only one of the many benefits of designing your
45 own Linux implementation.</para>
46
47 <para>We could compare Linux distributions to a hamburger purchased at
48 a fast-food restaurant&mdash;you have no idea what might be in what you
49 are eating. LFS, on the other hand, does not give you a hamburger.
50 Rather, LFS provides the recipe to make the exact hamburger desired.
51 This allows users to review the recipe, omit unwanted ingredients, and
52 add your own ingredients to enhance the flavor of the burger. When you
53 are satisfied with the recipe, move on to preparing it. It can be made
54 to exact specifications&mdash;broil it, bake it, deep-fry it, or
55 barbecue it.</para>
56
57 <para>Another analogy that we can use is that of comparing LFS with a
58 finished house. LFS provides the skeletal plan of a house, but it is up
59 to you to build it. LFS maintains the freedom to adjust plans throughout
60 the process, customizing it to the user's needs and preferences.</para>
61
62 <para>An additional advantage of a custom built Linux system is security.
63 By compiling the entire system from source code, you are empowered to
64 audit everything and apply all the security patches desired. It is no
65 longer necessary to wait for somebody else to compile binary packages
66 that fix a security hole. Unless you examine the patch and implement it
67 yourself, you have no guarantee that the new binary package was built
68 correctly and adequately fixes the problem.</para>
69
70 <para>The goal of Linux From Scratch is to build a complete and usable
71 foundation-level system. Readers who do not wish to build their own
72 Linux system from scratch may not benefit from the information in this
73 book. If you only want to know what happens while the computer boots,
74 we recommend the <quote>From Power Up To Bash Prompt</quote> HOWTO
75 located at <ulink url="http://axiom.anu.edu.au/~okeefe/p2b/"/> or on
76 The Linux Documentation Project's (TLDP) website at <ulink
77 url="http://www.tldp.org/HOWTO/From-PowerUp-To-Bash-Prompt-HOWTO.html"/>.
78 The HOWTO builds a system which is similar to that of this book, but it
79 focuses strictly on creating a system capable of booting to a BASH prompt.
80 Consider your objective. If you wish to build a Linux system while
81 learning along the way, then this book is your best choice.</para>
82
83 <para>There are too many good reasons to build your own LFS system to
84 list them all here. This section is only the tip of the iceberg. As
85 you continue in your LFS experience, you will find the power that
86 information and knowledge truly bring.</para>
87
88</sect1>
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