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107 lines
3.9 KiB
XML
107 lines
3.9 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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]>
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<sect1 id="postlfs-config-bootdisk" xreflabel="Creating a Custom Boot Device">
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<?dbhtml filename="bootdisk.html"?>
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<title>Creating a Custom Boot Device</title>
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<sect2>
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<title>Decent Rescue Boot Device Needs</title>
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<para>
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This section is really about creating a <emphasis>rescue</emphasis>
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device. As the name <emphasis>rescue</emphasis> implies, the host
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system has a problem, often lost partition information or corrupted file
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systems, that prevents it from booting and/or operating normally. For
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this reason, you <emphasis>must not</emphasis> depend on resources from
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the host being "rescued". To presume that any given partition or hard
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drive <emphasis>will</emphasis> be available is a risky presumption.
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</para>
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<para>
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In a modern system, there are many devices that can be used as a
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rescue device: floppy, cdrom, usb drive, or even a network card.
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Which one you use depends on your hardware and your BIOS. In the past,
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a rescue device was thought to be a floppy disk. Today, many
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systems do not even have a floppy drive.
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</para>
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<para>
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Building a complete rescue device is a challenging task. In many
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ways, it is equivalent to building an entire LFS system.
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In addition, it would be a repetition of information already available.
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For these reasons, the procedures for a rescue device image are not
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presented here.
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</para>
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</sect2>
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<sect2>
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<title>Creating a Rescue Floppy</title>
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<para>
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The software of today's systems has grown large. Linux 2.6 no longer
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supports booting directly from a floppy. In spite of this, there are
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solutions available using older versions of Linux. One of the best is
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Tom's Root/Boot Disk available at <ulink
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url='http://www.toms.net/rb/'/>. This will provide a minimal Linux
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system on a single floppy disk and provides the ability to customize
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the contents of your disk if necessary.
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</para>
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</sect2>
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<sect2>
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<title>Creating a Bootable CD-ROM</title>
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<para>
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There are several sources that can be used for a rescue CD-ROM.
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Just about any commercial distribution's installation CD-ROMs or
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DVDs will work. These include RedHat, Ubuntu, and SuSE. One
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very popular option is Knoppix.
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</para>
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<para>
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Also, the LFS Community has developed its own LiveCD available at
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<ulink url='https://www.&lfs-domainname;/livecd/'/>. This LiveCD, is no
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longer capable of building an entire LFS/BLFS system, but is still a
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good rescue CD-ROM. If you download the
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ISO image, use <xref linkend="xorriso"/> to copy the image to a
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CD-ROM.
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</para>
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<para>
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The instructions for using GRUB2 to make a custom rescue CD-ROM are
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also available in <ulink url='&lfs-root;/chapter10/grub.html'>LFS
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Chapter 10</ulink>.
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</para>
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</sect2>
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<sect2>
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<title>Creating a Bootable USB Drive</title>
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<para>
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A USB Pen drive, sometimes called a Thumb drive, is recognized by Linux
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as a SCSI device. Using one of these devices as a rescue device has
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the advantage that it is usually large enough to hold more than a
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minimal boot image. You can save critical data to the drive as well
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as use it to diagnose and recover a damaged system. Booting such a
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drive requires BIOS support, but building the system consists of
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formatting the drive, adding <application>GRUB</application> as well
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as the Linux kernel and supporting files.
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</para>
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<para condition="html" role="usernotes">User Notes:
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<ulink url='&blfs-wiki;/CreatingaCustomBootDevice'/>
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</para>
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</sect2>
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</sect1>
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