| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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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="ch-bootable-grub">
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| 9 | <?dbhtml filename="grub.html"?>
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| 10 |
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| 11 | <title>Making the CLFS System Bootable</title>
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| 12 |
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| 13 | <indexterm zone="ch-bootable-grub">
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| 14 | <primary sortas="a-GRUB">GRUB</primary>
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| 15 | <secondary>bootable</secondary>
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| 16 | </indexterm>
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| 17 |
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| 18 | <para os="a">Your shiny new CLFS system is almost complete. One of the last
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| 19 | things to do is to ensure that the system can be properly booted. The
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| 20 | instructions below apply only to computers of x86 and x86_64 architecture,
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| 21 | meaning mainstream PCs. Information on <quote>boot loading</quote> for
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| 22 | other architectures should be available in the usual resource-specific
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| 23 | locations for those architectures.</para>
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| 24 |
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| 25 | <para os="b">Boot loading can be a complex area, so a few cautionary words
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| 26 | are in order. Be familiar with the current boot loader and any other
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| 27 | operating systems present on the hard drive(s) that need to be bootable.
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| 28 | Make sure that an emergency boot disk is ready to <quote>rescue</quote>
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| 29 | the computer if the computer becomes unusable (un-bootable).</para>
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| 30 |
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| 31 | <para os="c">The first thing we need to do is generate a configuration for
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| 32 | GRUB. In previous versions of grub we could create the configuration manually
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| 33 | here, but with GRUB2 we can generate <filename>grub.cfg</filename>
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| 34 | automatically. You can do this with the following command:</para>
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| 35 |
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| 36 | <screen os="d"><userinput>grub-mkconfig -o /boot/grub/grub.cfg</userinput></screen>
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| 37 |
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| 38 | <warning os="w1">
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| 39 | <para>The following command will overwrite the current boot loader.
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| 40 | Do not run the command if this is not desired, for example, if using
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| 41 | a third party boot manager to manage the Master Boot Record (MBR).
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| 42 | In this scenario, it would make more sense to install GRUB into the
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| 43 | <quote>boot sector</quote> of the CLFS partition. In this case, this
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| 44 | next command would become <userinput>grub-install /dev/sda2</userinput>
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| 45 | .</para>
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| 46 | </warning>
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| 47 |
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| 48 | <para os="e">Instruct GRUB to install itself int othe MBR of
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| 49 | <filename class="partition">sda</filename>:</para>
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| 50 |
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| 51 | <screen os="f"><userinput>grub-install /dev/sda</userinput></screen>
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| 52 |
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| 53 | </sect1>
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