[d47e7ea9] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[ff769b8c] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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[d47e7ea9] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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| 7 | <!ENTITY ntp-download-http "http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-&ntp-version;.tar.gz">
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| 8 | <!ENTITY ntp-download-ftp "ftp://ftp.udel.edu/pub/ntp/ntp4/ntp-&ntp-version;.tar.gz">
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[f5f7f9d] | 9 | <!ENTITY ntp-md5sum "0f8fabe87cf54f409b57c6283f0c0c3d">
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[d47e7ea9] | 10 | <!ENTITY ntp-size "2.4 MB">
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| 11 | <!ENTITY ntp-buildsize "27 MB">
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| 12 | <!ENTITY ntp-time "0.53 SBU">
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| 13 | ]>
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| 14 |
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[619dd53] | 15 | <sect1 id="ntp" xreflabel="NTP-&ntp-version;">
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[dc6715a] | 16 | <?dbhtml filename="ntp.html"?>
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[56ab82c] | 17 |
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[dc6715a] | 18 | <sect1info>
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| 19 | <othername>$LastChangedBy$</othername>
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| 20 | <date>$Date$</date>
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| 21 | </sect1info>
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[56ab82c] | 22 |
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[dc6715a] | 23 | <title>NTP-&ntp-version;</title>
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[56ab82c] | 24 |
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[dc6715a] | 25 | <indexterm zone="ntp">
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| 26 | <primary sortas="a-NTP">NTP</primary>
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| 27 | </indexterm>
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| 28 |
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| 29 | <sect2 role="package">
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| 30 | <title>Introduction to NTP</title>
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[56ab82c] | 31 |
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| 32 | <para>The <application>NTP</application> package contains a
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| 33 | client and server to keep the time synchronized between various computers over
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| 34 | a network. This package is the official reference implementation of the
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[dc6715a] | 35 | NTP protocol.</para>
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[56ab82c] | 36 |
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[dc6715a] | 37 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 38 | <itemizedlist spacing="compact">
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| 39 | <listitem>
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| 40 | <para>Download (HTTP): <ulink url="&ntp-download-http;"/></para>
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| 41 | </listitem>
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| 42 | <listitem>
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| 43 | <para>Download (FTP): <ulink url="&ntp-download-ftp;"/></para>
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| 44 | </listitem>
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| 45 | <listitem>
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| 46 | <para>Download MD5 sum: &ntp-md5sum;</para>
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| 47 | </listitem>
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| 48 | <listitem>
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| 49 | <para>Download size: &ntp-size;</para>
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| 50 | </listitem>
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| 51 | <listitem>
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| 52 | <para>Estimated disk space required: &ntp-buildsize;</para>
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| 53 | </listitem>
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| 54 | <listitem>
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[2174baa] | 55 | <para>Estimated build time: &ntp-time;</para>
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| 56 | </listitem>
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[dc6715a] | 57 | </itemizedlist>
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[56ab82c] | 58 |
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[db0eb6a] | 59 | <bridgehead renderas="sect3">NTP Dependencies</bridgehead>
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[56ab82c] | 60 |
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[dc6715a] | 61 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 62 | <para><xref linkend="openssl"/></para>
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[56ab82c] | 63 |
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[dc6715a] | 64 | </sect2>
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[56ab82c] | 65 |
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[dc6715a] | 66 | <sect2 role="installation">
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| 67 | <title>Installation of NTP</title>
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| 68 |
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[56ab82c] | 69 | <para>Install <application>NTP</application> by running
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[dc6715a] | 70 | the following commands:</para>
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| 71 |
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| 72 | <screen><userinput>./configure --prefix=/usr --bindir=/usr/sbin \
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[d47e7ea9] | 73 | --sysconfdir=/etc &&
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[11cf9f2] | 74 | make</userinput></screen>
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| 75 |
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| 76 | <para>To test the results, issue: <command>make check</command>.</para>
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[56ab82c] | 77 |
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[11cf9f2] | 78 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[56ab82c] | 79 |
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[339fbfb9] | 80 | <screen role="root"><userinput>make install &&
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| 81 | install -v -m755 -d /usr/share/doc/ntp-&ntp-version; &&
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[45d5ee9] | 82 | cp -v -R html /usr/share/doc/ntp-&ntp-version;/</userinput></screen>
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[11cf9f2] | 83 |
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[dc6715a] | 84 | </sect2>
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[56ab82c] | 85 |
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[dc6715a] | 86 | <sect2 role="configuration">
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| 87 | <title>Configuring NTP</title>
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[56ab82c] | 88 |
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[dc6715a] | 89 | <sect3 id="ntp-config">
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| 90 | <title>Config Files</title>
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[56ab82c] | 91 |
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[dc6715a] | 92 | <para><filename>/etc/ntp.conf</filename></para>
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[56ab82c] | 93 |
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[dc6715a] | 94 | <indexterm zone="ntp ntp-config">
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| 95 | <primary sortas="e-etc-ntp.conf">/etc/ntp.conf</primary>
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| 96 | </indexterm>
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[56ab82c] | 97 |
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[dc6715a] | 98 | </sect3>
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[56ab82c] | 99 |
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[dc6715a] | 100 | <sect3>
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| 101 | <title>Configuration Information</title>
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| 102 |
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| 103 | <para>The following configuration file defines various NTP
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| 104 | stratum 2 servers with open access from different continents. It also
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| 105 | creates a drift file where <command>ntpd</command> stores the frequency
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| 106 | offset. Since the documentation included with the package is sparse,
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| 107 | visit the NTP website at <ulink url="http://www.ntp.org/"/> for more information.</para>
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| 108 |
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| 109 | <screen role="root"><userinput>cat > /etc/ntp.conf << "EOF"
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| 110 | <literal># Africa
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[d47e7ea9] | 111 | server tock.nml.csir.co.za
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| 112 |
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| 113 | # Asia
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| 114 | server ntp.shim.org
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| 115 |
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| 116 | # Australia
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| 117 | server ntp.saard.net
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[56ab82c] | 118 |
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[d47e7ea9] | 119 | # Europe
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| 120 | server ntp.tuxfamily.net
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| 121 |
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| 122 | # North America
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| 123 | server clock.psu.edu
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| 124 |
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[dc6715a] | 125 | driftfile /var/cache/ntp.drift</literal>
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| 126 | EOF</userinput></screen>
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| 127 |
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| 128 | </sect3>
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[56ab82c] | 129 |
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[dc6715a] | 130 | <sect3 id="ntp-init">
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| 131 | <title>Synchronizing the Time</title>
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| 132 |
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| 133 | <para>There are two options. Option one is to run <command>ntpd</command>
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[56ab82c] | 134 | continuously and allow it to synchronize the time in a gradual manner. The
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[dc6715a] | 135 | other option is to run <command>ntpd</command> periodically (using cron)
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| 136 | and update the time each time <command>ntpd</command> is scheduled.</para>
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[56ab82c] | 137 |
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| 138 | <para>If you choose Option one, then install the
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[dc6715a] | 139 | <filename>/etc/rc.d/init.d/ntp</filename>
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| 140 | init script included in the
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| 141 | <xref linkend="intro-important-bootscripts"/> package.</para>
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[56ab82c] | 142 |
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| 143 | <indexterm zone="ntp ntp-init">
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[dc6715a] | 144 | <primary sortas="f-ntp">ntp</primary>
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[56ab82c] | 145 | </indexterm>
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[dc6715a] | 146 |
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| 147 | <screen role="root"><userinput>make install-ntp</userinput></screen>
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| 148 |
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[56ab82c] | 149 | <para>If you prefer to run <command>ntpd</command> periodically, add the
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| 150 | following command to <systemitem class="username">root</systemitem>'s
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[dc6715a] | 151 | <filename>crontab</filename>:</para>
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[56ab82c] | 152 |
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[dc6715a] | 153 | <screen><literal>ntpd -q</literal></screen>
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| 154 |
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| 155 | <para>Execute the following command if you would like to set the
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[339fbfb9] | 156 | hardware clock to the current system time at shutdown and reboot:</para>
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[dc6715a] | 157 |
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[e3353b3] | 158 | <screen role="root"><userinput>ln -v -sf ../init.d/setclock /etc/rc.d/rc0.d/K46setclock &&
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| 159 | ln -v -sf ../init.d/setclock /etc/rc.d/rc6.d/K46setclock</userinput></screen>
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[dc6715a] | 160 |
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| 161 | <para>The other way around is already set up by LFS.</para>
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[56ab82c] | 162 |
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[dc6715a] | 163 | </sect3>
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[56ab82c] | 164 |
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[dc6715a] | 165 | </sect2>
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[56ab82c] | 166 |
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[dc6715a] | 167 | <sect2 role="content">
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| 168 | <title>Contents</title>
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[56ab82c] | 169 |
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[dc6715a] | 170 | <segmentedlist>
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| 171 | <segtitle>Installed Programs</segtitle>
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| 172 | <segtitle>Installed Libraries</segtitle>
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[22292f3a] | 173 | <segtitle>Installed Directory</segtitle>
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[56ab82c] | 174 |
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[dc6715a] | 175 | <seglistitem>
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[56ab82c] | 176 | <seg>ntp-keygen, ntp-wait, ntpd, ntpdate, ntpdc, ntpq,
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[dc6715a] | 177 | ntptime, ntptrace, and tickadj</seg>
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| 178 | <seg>None</seg>
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[22292f3a] | 179 | <seg>/usr/share/doc/ntp-&ntp-version;</seg>
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[dc6715a] | 180 | </seglistitem>
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| 181 | </segmentedlist>
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[56ab82c] | 182 |
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[dc6715a] | 183 | <variablelist>
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| 184 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 185 | <?dbfo list-presentation="list"?>
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| 186 | <?dbhtml list-presentation="table"?>
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[56ab82c] | 187 |
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[dc6715a] | 188 | <varlistentry id="ntp-keygen">
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| 189 | <term><command>ntp-keygen</command></term>
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| 190 | <listitem>
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[56ab82c] | 191 | <para>generates cryptographic data files used by the NTPv4 authentication
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[dc6715a] | 192 | and identification schemes.</para>
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| 193 | <indexterm zone="ntp ntp-keygen">
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| 194 | <primary sortas="b-ntp-keygen">ntp-keygen</primary>
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| 195 | </indexterm>
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| 196 | </listitem>
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| 197 | </varlistentry>
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[56ab82c] | 198 |
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[dc6715a] | 199 | <varlistentry id="ntp-wait">
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| 200 | <term><command>ntp-wait</command></term>
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| 201 | <listitem>
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[56ab82c] | 202 | <para>is useful at boot time, to delay the boot sequence until
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[dc6715a] | 203 | <command>ntpd</command> has set the time.</para>
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| 204 | <indexterm zone="ntp ntp-wait">
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| 205 | <primary sortas="b-ntp-wait">ntp-wait</primary>
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| 206 | </indexterm>
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| 207 | </listitem>
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| 208 | </varlistentry>
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[56ab82c] | 209 |
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[dc6715a] | 210 | <varlistentry id="ntpd">
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| 211 | <term><command>ntpd</command></term>
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| 212 | <listitem>
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[56ab82c] | 213 | <para>is a NTP daemon that runs in the background and keeps
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| 214 | the date and time synchronized based on response from configured
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[dc6715a] | 215 | NTP servers. It also functions as a NTP server.</para>
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| 216 | <indexterm zone="ntp ntpd">
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| 217 | <primary sortas="b-ntpd">ntpd</primary>
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| 218 | </indexterm>
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| 219 | </listitem>
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| 220 | </varlistentry>
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[56ab82c] | 221 |
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[dc6715a] | 222 | <varlistentry id="ntpdate">
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| 223 | <term><command>ntpdate</command></term>
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| 224 | <listitem>
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[56ab82c] | 225 | <para>is a client program that sets the date and time based on
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[dc6715a] | 226 | the response from an NTP server. This command is deprecated.</para>
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| 227 | <indexterm zone="ntp ntpdate">
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| 228 | <primary sortas="b-ntpdate">ntpdate</primary>
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| 229 | </indexterm>
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| 230 | </listitem>
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| 231 | </varlistentry>
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[56ab82c] | 232 |
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[dc6715a] | 233 | <varlistentry id="ntpdc">
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| 234 | <term><command>ntpdc</command></term>
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| 235 | <listitem>
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[56ab82c] | 236 | <para>is used to query the NTP daemon about its current state
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[dc6715a] | 237 | and to request changes in that state.</para>
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| 238 | <indexterm zone="ntp ntpdc">
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| 239 | <primary sortas="b-ntpdc">ntpdc</primary>
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| 240 | </indexterm>
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| 241 | </listitem>
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| 242 | </varlistentry>
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[56ab82c] | 243 |
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[dc6715a] | 244 | <varlistentry id="ntpq">
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| 245 | <term><command>ntpq</command></term>
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| 246 | <listitem>
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[56ab82c] | 247 | <para>is an utility program used to monitor <command>ntpd</command>
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[dc6715a] | 248 | operations and determine performance.</para>
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| 249 | <indexterm zone="ntp ntpq">
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| 250 | <primary sortas="b-ntpq">ntpq</primary>
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| 251 | </indexterm>
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| 252 | </listitem>
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| 253 | </varlistentry>
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[56ab82c] | 254 |
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[dc6715a] | 255 | <varlistentry id="ntptime">
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| 256 | <term><command>ntptime</command></term>
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| 257 | <listitem>
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| 258 | <para>reads and displays time-related kernel variables.</para>
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| 259 | <indexterm zone="ntp ntptime">
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| 260 | <primary sortas="b-ntptime">ntptime</primary>
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| 261 | </indexterm>
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| 262 | </listitem>
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| 263 | </varlistentry>
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[56ab82c] | 264 |
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[dc6715a] | 265 | <varlistentry id="ntptrace">
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| 266 | <term><command>ntptrace</command></term>
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| 267 | <listitem>
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| 268 | <para>traces a chain of NTP servers back to the primary source.</para>
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| 269 | <indexterm zone="ntp ntptrace">
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[56ab82c] | 270 | <primary sortas="b-ntptrace">ntptrace</primary>
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[dc6715a] | 271 | </indexterm>
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| 272 | </listitem>
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| 273 | </varlistentry>
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[56ab82c] | 274 |
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[dc6715a] | 275 | <varlistentry id="tickadj">
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| 276 | <term><command>tickadj</command></term>
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| 277 | <listitem>
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[56ab82c] | 278 | <para>reads, and optionally modifies, several timekeeping-related
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| 279 | variables in older kernels that do not have support for precision
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[dc6715a] | 280 | timekeeping.</para>
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| 281 | <indexterm zone="ntp tickadj">
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| 282 | <primary sortas="b-tickadj">tickadj</primary>
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| 283 | </indexterm>
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| 284 | </listitem>
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| 285 | </varlistentry>
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[56ab82c] | 286 |
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[dc6715a] | 287 | </variablelist>
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[56ab82c] | 288 |
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[dc6715a] | 289 | </sect2>
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[56ab82c] | 290 |
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[39f01ca] | 291 | </sect1>
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