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Last change
on this file since 5b9b502 was f1ce80b, checked in by DJ Lucas <dj@…>, 8 years ago |
[systemd-merge] - Section II layout
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@17433 af4574ff-66df-0310-9fd7-8a98e5e911e0
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[f8d632ac] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[6732c094] | 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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[f8d632ac] | 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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[f1ce80b] | 8 | <sect1 id="postlfs-config-random" xreflabel="Random number generation" revision="sysv">
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[5a1ffdd] | 9 | <?dbhtml filename="random.html"?>
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| 10 |
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| 11 | <sect1info>
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| 12 | <othername>$LastChangedBy$</othername>
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| 13 | <date>$Date$</date>
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| 14 | </sect1info>
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| 15 |
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| 16 | <title>Random Number Generation</title>
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| 17 |
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| 18 | <indexterm zone="postlfs-config-random">
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| 19 | <primary sortas="f-random">random</primary>
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| 20 | </indexterm>
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| 21 |
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| 22 | <para>The Linux kernel supplies a random number generator which is accessed
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[e0d33ef] | 23 | through <filename class="devicefile">/dev/random</filename> and
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| 24 | <filename class="devicefile">/dev/urandom</filename>. Programs that utilize
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| 25 | the random and urandom devices, such as <application>OpenSSH</application>,
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[5a1ffdd] | 26 | will benefit from these instructions.</para>
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| 27 |
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| 28 | <para>When a Linux system starts up without much operator interaction, the
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[853ae568] | 29 | entropy pool (data used to compute a random number) may be in a fairly
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[5a1ffdd] | 30 | predictable state. This creates the real possibility that the number generated
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| 31 | at startup may always be the same. In order to counteract this effect,
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| 32 | you should carry the entropy pool information across your shut-downs and
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| 33 | start-ups.</para>
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| 34 |
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[e0d33ef] | 35 | <para>Install the <filename>/etc/rc.d/init.d/random</filename> init script
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[f1ce80b] | 36 | included with the <xref linkend="bootscripts"/> package.</para>
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[5a1ffdd] | 37 |
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| 38 | <screen role="root"><userinput>make install-random</userinput></screen>
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[f45b1953] | 39 |
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| 40 | </sect1>
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