1 | <?xml version="1.0" encoding="UTF-8"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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5 | %general-entities;
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6 | ]>
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7 |
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8 | <sect1 id="postlfs-config-bootdisk" xreflabel="Creating a Custom Boot Device">
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9 | <?dbhtml filename="bootdisk.html"?>
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10 |
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11 |
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12 | <title>Creating a Custom Boot Device</title>
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13 |
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14 | <sect2>
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15 | <title>Decent Rescue Boot Device Needs</title>
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16 |
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17 | <para>
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18 | This section is really about creating a <emphasis>rescue</emphasis>
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19 | device. As the name <emphasis>rescue</emphasis> implies, the host
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20 | system has a problem, often lost partition information or corrupted file
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21 | systems, that prevents it from booting and/or operating normally. For
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22 | this reason, you <emphasis>must not</emphasis> depend on resources from
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23 | the host being "rescued". To presume that any given partition or hard
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24 | drive <emphasis>will</emphasis> be available is a risky presumption.
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25 | </para>
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26 |
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27 | <para>
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28 | In a modern system, there are many devices that can be used as a
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29 | rescue device: floppy, cdrom, usb drive, or even a network card.
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30 | Which one you use depends on your hardware and your BIOS. In the past,
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31 | a rescue device was thought to be a floppy disk. Today, many
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32 | systems do not even have a floppy drive.
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33 | </para>
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34 |
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35 | <para>
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36 | Building a complete rescue device is a challenging task. In many
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37 | ways, it is equivalent to building an entire LFS system.
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38 | In addition, it would be a repetition of information already available.
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39 | For these reasons, the procedures for a rescue device image are not
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40 | presented here.
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41 | </para>
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42 |
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43 | </sect2>
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44 |
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45 | <sect2>
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46 | <title>Creating a Rescue Floppy</title>
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47 |
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48 | <para>
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49 | The software of today's systems has grown large. Linux 2.6 no longer
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50 | supports booting directly from a floppy. In spite of this, there are
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51 | solutions available using older versions of Linux. One of the best is
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52 | Tom's Root/Boot Disk available at <ulink
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53 | url='http://www.toms.net/rb/'/>. This will provide a minimal Linux
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54 | system on a single floppy disk and provides the ability to customize
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55 | the contents of your disk if necessary.
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56 | </para>
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57 |
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58 | </sect2>
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59 |
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60 | <sect2>
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61 | <title>Creating a Bootable CD-ROM</title>
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62 |
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63 | <para>
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64 | There are several sources that can be used for a rescue CD-ROM.
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65 | Just about any commercial distribution's installation CD-ROMs or
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66 | DVDs will work. These include RedHat, Ubuntu, and SuSE. One
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67 | very popular option is Knoppix.
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68 | </para>
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69 |
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70 | <para>
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71 | Also, the LFS Community has developed its own LiveCD available at
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72 | <ulink url='https://www.&lfs-domainname;/livecd/'/>. This LiveCD, is no
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73 | longer capable of building an entire LFS/BLFS system, but is still a
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74 | good rescue CD-ROM. If you download the
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75 | ISO image, use <xref linkend="xorriso"/> to copy the image to a
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76 | CD-ROM.
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77 | </para>
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78 |
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79 | <para>
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80 | The instructions for using GRUB2 to make a custom rescue CD-ROM are
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81 | also available in <ulink url='&lfs-root;/chapter10/grub.html'>LFS
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82 | Chapter 10</ulink>.
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83 | </para>
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84 |
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85 | </sect2>
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86 |
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87 | <sect2>
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88 | <title>Creating a Bootable USB Drive</title>
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89 |
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90 | <para>
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91 | A USB Pen drive, sometimes called a Thumb drive, is recognized by Linux
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92 | as a SCSI device. Using one of these devices as a rescue device has
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93 | the advantage that it is usually large enough to hold more than a
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94 | minimal boot image. You can save critical data to the drive as well
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95 | as use it to diagnose and recover a damaged system. Booting such a
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96 | drive requires BIOS support, but building the system consists of
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97 | formatting the drive, adding <application>GRUB</application> as well
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98 | as the Linux kernel and supporting files.
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99 | </para>
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100 |
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101 | </sect2>
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102 | </sect1>
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