1 <sect1 id="pre-whoread">
2 <title>Who would want to read this book</title>
3 <?dbhtml filename="whoread.html" dir="preface"?>
5 <para>There are many reasons why somebody would want to read this book. The
6 principle reason being to install an LFS system. A question many people raise
7 is "Why go through all the hassle of manually building a Linux system
8 from scratch when you can just download and install an existing one?". That
9 is a good question.</para>
11 <para>One important reason for LFS' existence is to help people
12 learn how a Linux system works from the inside out. Building an LFS system
13 helps demonstrate what makes Linux tick, and how things work together and
14 depend on each other. And perhaps most importantly, how to customize it to
15 your own tastes and needs.</para>
17 <para>A key benefit of LFS is that you have more control of your system
18 without relying on someone else's Linux implementation. With LFS, you are
19 in the driver's seat and dictate every aspect of your system, such as the
20 directory layout and boot script setup. You also dictate where, why and how
21 programs are installed.</para>
23 <para>Another benefit of LFS is the ability to create a very compact Linux
24 system. When installing a regular distribution, you end up with several
25 programs which you are likely to never use. They're just sitting there wasting
26 (precious) disk space. It isn't difficult to build an LFS system less than
27 100 MB. Does that still sound like a lot? A few of us have been working on
28 creating a very small embedded LFS system. We successfully built a system
29 that was just enough to run the Apache web server with approximately 8MB
30 of disk space used. Further stripping could bring that down to 5 MB or
31 less. Try that with a regular distribution.</para>
33 <para>We could compare distributed Linux to a hamburger you buy at a
34 fast-food restaurant, you have no idea what you are eating. LFS on the
35 other hand, doesn't give you a hamburger, but the recipe to make a hamburger.
36 This allows you to review it, to omit unwanted ingredients, and to
37 add your own ingredients which enhance the flavor of your burger. When you
38 are satisfied with the recipe, you go on to preparing it. You make it just
39 the way you like it: broil it, bake it, deep-fry it, barbeque it, or eat it
42 <para>Another analogy that we can use is that of comparing LFS with a
43 finished house. LFS will give you the skeletal plan of a house, but it's up
44 to you to build it. You have the freedom to adjust your plans as you
47 <para>Another advantage of a custom built Linux system is security.
48 By compiling the entire system from source code, you are empowered to audit
49 everything and apply all the security patches you feel are needed. You don't
50 have to wait for somebody else to compile binary packages that fix a security
51 hole. Unless you examine the patch and build it yourself you have no
52 guarantee that the new package was built correctly and actually fixes the
53 problem (adequately). You never truly know whether a security hole is fixed
54 or not unless you do it yourself.</para>