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43 lines
1.5 KiB
XML
43 lines
1.5 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-random" xreflabel="Random number generation" revision="sysv">
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<?dbhtml filename="random.html"?>
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<title>Random Number Generation</title>
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<indexterm zone="postlfs-config-random">
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<primary sortas="f-random">random</primary>
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</indexterm>
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<para>
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The Linux kernel supplies a random number generator which is accessed
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through <filename class="devicefile">/dev/random</filename> and
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<filename class="devicefile">/dev/urandom</filename>. Programs that utilize
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the random and urandom devices, such as <application>OpenSSH</application>,
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will benefit from these instructions.
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</para>
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<para>
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When a Linux system starts up without much operator interaction, the
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entropy pool (data used to compute a random number) may be in a fairly
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predictable state. This creates the real possibility that the number
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generated at startup may always be the same. In order to counteract
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this effect, you should carry the entropy pool information across your
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shut-downs and start-ups.
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</para>
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<para>
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Install the <filename>/etc/rc.d/init.d/random</filename> init script
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included with the <xref linkend="bootscripts"/> package.
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</para>
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<screen role="root"><userinput>make install-random</userinput></screen>
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</sect1>
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