[d47e7ea9] | 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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[d47e7ea9] | 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 |
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[36474cb] | 7 | <!ENTITY ntp-download-http "http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-&ntp-version;.tar.gz">
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[ea804bc] | 8 | <!ENTITY ntp-download-ftp " ">
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| 9 | <!-- <!ENTITY ntp-download-ftp "ftp://ftp.udel.edu/pub/ntp/ntp4/ntp-4.2/ntp-&ntp-version;.tar.gz"> -->
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[36474cb] | 10 | <!ENTITY ntp-md5sum "6f381e3764eac481bed9cf7e4d508952">
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| 11 | <!ENTITY ntp-size "3.3 MB">
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| 12 | <!ENTITY ntp-buildsize "27.2 MB">
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[9d91468a] | 13 | <!ENTITY ntp-time "0.4 SBU">
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[d47e7ea9] | 14 | ]>
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| 15 |
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[619dd53] | 16 | <sect1 id="ntp" xreflabel="NTP-&ntp-version;">
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[dc6715a] | 17 | <?dbhtml filename="ntp.html"?>
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[56ab82c] | 18 |
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[dc6715a] | 19 | <sect1info>
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| 20 | <othername>$LastChangedBy$</othername>
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| 21 | <date>$Date$</date>
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| 22 | </sect1info>
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[56ab82c] | 23 |
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[dc6715a] | 24 | <title>NTP-&ntp-version;</title>
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[56ab82c] | 25 |
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[dc6715a] | 26 | <indexterm zone="ntp">
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| 27 | <primary sortas="a-NTP">NTP</primary>
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| 28 | </indexterm>
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| 29 |
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| 30 | <sect2 role="package">
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| 31 | <title>Introduction to NTP</title>
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[56ab82c] | 32 |
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| 33 | <para>The <application>NTP</application> package contains a
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| 34 | client and server to keep the time synchronized between various computers over
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| 35 | a network. This package is the official reference implementation of the
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[dc6715a] | 36 | NTP protocol.</para>
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[56ab82c] | 37 |
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[dc6715a] | 38 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 39 | <itemizedlist spacing="compact">
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| 40 | <listitem>
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| 41 | <para>Download (HTTP): <ulink url="&ntp-download-http;"/></para>
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| 42 | </listitem>
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| 43 | <listitem>
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| 44 | <para>Download (FTP): <ulink url="&ntp-download-ftp;"/></para>
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| 45 | </listitem>
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| 46 | <listitem>
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| 47 | <para>Download MD5 sum: &ntp-md5sum;</para>
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| 48 | </listitem>
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| 49 | <listitem>
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| 50 | <para>Download size: &ntp-size;</para>
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| 51 | </listitem>
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| 52 | <listitem>
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| 53 | <para>Estimated disk space required: &ntp-buildsize;</para>
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| 54 | </listitem>
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| 55 | <listitem>
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[2174baa] | 56 | <para>Estimated build time: &ntp-time;</para>
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| 57 | </listitem>
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[dc6715a] | 58 | </itemizedlist>
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[56ab82c] | 59 |
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[9d91468a] | 60 | <!--
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[abf1070b] | 61 | <bridgehead renderas="sect3">Additional Downloads</bridgehead>
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| 62 | <itemizedlist spacing='compact'>
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| 63 | <listitem>
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| 64 | <para>Required patch: <ulink
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| 65 | url="&patch-root;/ntp-&ntp-version;-gcc4-1.patch"/></para>
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| 66 | </listitem>
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| 67 | </itemizedlist>
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[9d91468a] | 68 | -->
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[abf1070b] | 69 |
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[db0eb6a] | 70 | <bridgehead renderas="sect3">NTP Dependencies</bridgehead>
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[56ab82c] | 71 |
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[dc6715a] | 72 | <bridgehead renderas="sect4">Optional</bridgehead>
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[4dbbf634] | 73 | <para role="optional"><xref linkend="openssl"/></para>
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[56ab82c] | 74 |
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[061ec9d] | 75 | <para condition="html" role="usernotes">User Notes:
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| 76 | <ulink url="&blfs-wiki;/ntp"/></para>
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| 77 |
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[dc6715a] | 78 | </sect2>
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[56ab82c] | 79 |
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[dc6715a] | 80 | <sect2 role="installation">
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| 81 | <title>Installation of NTP</title>
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| 82 |
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[56ab82c] | 83 | <para>Install <application>NTP</application> by running
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[dc6715a] | 84 | the following commands:</para>
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| 85 |
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[36474cb] | 86 | <screen><userinput>./configure --prefix=/usr --sysconfdir=/etc \
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| 87 | --with-binsubdir=sbin &&
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[11cf9f2] | 88 | make</userinput></screen>
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| 89 |
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| 90 | <para>To test the results, issue: <command>make check</command>.</para>
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[56ab82c] | 91 |
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[11cf9f2] | 92 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[56ab82c] | 93 |
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[339fbfb9] | 94 | <screen role="root"><userinput>make install &&
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| 95 | install -v -m755 -d /usr/share/doc/ntp-&ntp-version; &&
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[36474cb] | 96 | cp -v -R html/* /usr/share/doc/ntp-&ntp-version;/</userinput></screen>
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| 97 |
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| 98 | </sect2>
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| 99 |
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| 100 | <sect2 role="commands">
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| 101 | <title>Command Explanations</title>
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| 102 |
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| 103 | <para><parameter>--with-binsubdir=sbin</parameter>: This parameter places
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| 104 | the administrative programs in <filename
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| 105 | class="directory">/usr/sbin</filename>.</para>
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[11cf9f2] | 106 |
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[dc6715a] | 107 | </sect2>
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[56ab82c] | 108 |
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[dc6715a] | 109 | <sect2 role="configuration">
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| 110 | <title>Configuring NTP</title>
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[56ab82c] | 111 |
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[dc6715a] | 112 | <sect3 id="ntp-config">
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| 113 | <title>Config Files</title>
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[56ab82c] | 114 |
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[dc6715a] | 115 | <para><filename>/etc/ntp.conf</filename></para>
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[56ab82c] | 116 |
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[dc6715a] | 117 | <indexterm zone="ntp ntp-config">
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| 118 | <primary sortas="e-etc-ntp.conf">/etc/ntp.conf</primary>
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| 119 | </indexterm>
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[56ab82c] | 120 |
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[dc6715a] | 121 | </sect3>
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[56ab82c] | 122 |
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[dc6715a] | 123 | <sect3>
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| 124 | <title>Configuration Information</title>
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| 125 |
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[ea57941f] | 126 | <para>The following configuration file defines various NTP servers with
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| 127 | open access from different continents. It also creates a drift file where
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| 128 | <command>ntpd</command> stores the frequency offset. Since the
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| 129 | documentation included with the package is sparse, visit the NTP website
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| 130 | at <ulink url="http://www.ntp.org/"/> and <ulink
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| 131 | url="http://www.pool.ntp.org/"/> for more information.</para>
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[dc6715a] | 132 |
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| 133 | <screen role="root"><userinput>cat > /etc/ntp.conf << "EOF"
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| 134 | <literal># Africa
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[d47e7ea9] | 135 | server tock.nml.csir.co.za
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| 136 |
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| 137 | # Asia
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[bca6dfb6] | 138 | server 0.asia.pool.ntp.org
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[d47e7ea9] | 139 |
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| 140 | # Australia
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[bca6dfb6] | 141 | server 0.oceania.pool.ntp.org
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[56ab82c] | 142 |
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[d47e7ea9] | 143 | # Europe
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[ea57941f] | 144 | server 0.europe.pool.ntp.org
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[d47e7ea9] | 145 |
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| 146 | # North America
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[ea57941f] | 147 | server 0.north-america.pool.ntp.org
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| 148 |
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| 149 | # South America
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[bca6dfb6] | 150 | server 2.south-america.pool.ntp.org
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[d47e7ea9] | 151 |
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[dc6715a] | 152 | driftfile /var/cache/ntp.drift</literal>
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| 153 | EOF</userinput></screen>
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| 154 |
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| 155 | </sect3>
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[56ab82c] | 156 |
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[dc6715a] | 157 | <sect3 id="ntp-init">
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| 158 | <title>Synchronizing the Time</title>
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| 159 |
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| 160 | <para>There are two options. Option one is to run <command>ntpd</command>
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[56ab82c] | 161 | continuously and allow it to synchronize the time in a gradual manner. The
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[dc6715a] | 162 | other option is to run <command>ntpd</command> periodically (using cron)
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| 163 | and update the time each time <command>ntpd</command> is scheduled.</para>
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[56ab82c] | 164 |
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| 165 | <para>If you choose Option one, then install the
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[dc6715a] | 166 | <filename>/etc/rc.d/init.d/ntp</filename>
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| 167 | init script included in the
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[5254d12] | 168 | <xref linkend="bootscripts"/> package.</para>
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[56ab82c] | 169 |
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| 170 | <indexterm zone="ntp ntp-init">
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[dc6715a] | 171 | <primary sortas="f-ntp">ntp</primary>
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[56ab82c] | 172 | </indexterm>
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[dc6715a] | 173 |
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| 174 | <screen role="root"><userinput>make install-ntp</userinput></screen>
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| 175 |
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[56ab82c] | 176 | <para>If you prefer to run <command>ntpd</command> periodically, add the
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| 177 | following command to <systemitem class="username">root</systemitem>'s
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[dc6715a] | 178 | <filename>crontab</filename>:</para>
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[56ab82c] | 179 |
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[dc6715a] | 180 | <screen><literal>ntpd -q</literal></screen>
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| 181 |
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| 182 | <para>Execute the following command if you would like to set the
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[339fbfb9] | 183 | hardware clock to the current system time at shutdown and reboot:</para>
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[dc6715a] | 184 |
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[e3353b3] | 185 | <screen role="root"><userinput>ln -v -sf ../init.d/setclock /etc/rc.d/rc0.d/K46setclock &&
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| 186 | ln -v -sf ../init.d/setclock /etc/rc.d/rc6.d/K46setclock</userinput></screen>
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[dc6715a] | 187 |
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| 188 | <para>The other way around is already set up by LFS.</para>
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[56ab82c] | 189 |
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[dc6715a] | 190 | </sect3>
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[56ab82c] | 191 |
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[dc6715a] | 192 | </sect2>
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[56ab82c] | 193 |
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[dc6715a] | 194 | <sect2 role="content">
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| 195 | <title>Contents</title>
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[56ab82c] | 196 |
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[dc6715a] | 197 | <segmentedlist>
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| 198 | <segtitle>Installed Programs</segtitle>
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| 199 | <segtitle>Installed Libraries</segtitle>
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[22292f3a] | 200 | <segtitle>Installed Directory</segtitle>
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[56ab82c] | 201 |
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[dc6715a] | 202 | <seglistitem>
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[56ab82c] | 203 | <seg>ntp-keygen, ntp-wait, ntpd, ntpdate, ntpdc, ntpq,
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[36474cb] | 204 | ntptime, ntptrace, sntp and tickadj</seg>
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[dc6715a] | 205 | <seg>None</seg>
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[22292f3a] | 206 | <seg>/usr/share/doc/ntp-&ntp-version;</seg>
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[dc6715a] | 207 | </seglistitem>
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| 208 | </segmentedlist>
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[56ab82c] | 209 |
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[dc6715a] | 210 | <variablelist>
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| 211 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 212 | <?dbfo list-presentation="list"?>
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| 213 | <?dbhtml list-presentation="table"?>
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[56ab82c] | 214 |
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[dc6715a] | 215 | <varlistentry id="ntp-keygen">
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| 216 | <term><command>ntp-keygen</command></term>
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| 217 | <listitem>
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[56ab82c] | 218 | <para>generates cryptographic data files used by the NTPv4 authentication
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[dc6715a] | 219 | and identification schemes.</para>
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| 220 | <indexterm zone="ntp ntp-keygen">
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| 221 | <primary sortas="b-ntp-keygen">ntp-keygen</primary>
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| 222 | </indexterm>
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| 223 | </listitem>
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| 224 | </varlistentry>
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[56ab82c] | 225 |
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[dc6715a] | 226 | <varlistentry id="ntp-wait">
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| 227 | <term><command>ntp-wait</command></term>
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| 228 | <listitem>
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[56ab82c] | 229 | <para>is useful at boot time, to delay the boot sequence until
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[dc6715a] | 230 | <command>ntpd</command> has set the time.</para>
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| 231 | <indexterm zone="ntp ntp-wait">
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| 232 | <primary sortas="b-ntp-wait">ntp-wait</primary>
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| 233 | </indexterm>
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| 234 | </listitem>
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| 235 | </varlistentry>
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[56ab82c] | 236 |
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[dc6715a] | 237 | <varlistentry id="ntpd">
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| 238 | <term><command>ntpd</command></term>
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| 239 | <listitem>
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[56ab82c] | 240 | <para>is a NTP daemon that runs in the background and keeps
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| 241 | the date and time synchronized based on response from configured
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[dc6715a] | 242 | NTP servers. It also functions as a NTP server.</para>
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| 243 | <indexterm zone="ntp ntpd">
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| 244 | <primary sortas="b-ntpd">ntpd</primary>
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| 245 | </indexterm>
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| 246 | </listitem>
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| 247 | </varlistentry>
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[56ab82c] | 248 |
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[dc6715a] | 249 | <varlistentry id="ntpdate">
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| 250 | <term><command>ntpdate</command></term>
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| 251 | <listitem>
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[56ab82c] | 252 | <para>is a client program that sets the date and time based on
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[dc6715a] | 253 | the response from an NTP server. This command is deprecated.</para>
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| 254 | <indexterm zone="ntp ntpdate">
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| 255 | <primary sortas="b-ntpdate">ntpdate</primary>
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| 256 | </indexterm>
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| 257 | </listitem>
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| 258 | </varlistentry>
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[56ab82c] | 259 |
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[dc6715a] | 260 | <varlistentry id="ntpdc">
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| 261 | <term><command>ntpdc</command></term>
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| 262 | <listitem>
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[56ab82c] | 263 | <para>is used to query the NTP daemon about its current state
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[dc6715a] | 264 | and to request changes in that state.</para>
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| 265 | <indexterm zone="ntp ntpdc">
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| 266 | <primary sortas="b-ntpdc">ntpdc</primary>
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| 267 | </indexterm>
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| 268 | </listitem>
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| 269 | </varlistentry>
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[56ab82c] | 270 |
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[dc6715a] | 271 | <varlistentry id="ntpq">
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| 272 | <term><command>ntpq</command></term>
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| 273 | <listitem>
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[56ab82c] | 274 | <para>is an utility program used to monitor <command>ntpd</command>
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[dc6715a] | 275 | operations and determine performance.</para>
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| 276 | <indexterm zone="ntp ntpq">
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| 277 | <primary sortas="b-ntpq">ntpq</primary>
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| 278 | </indexterm>
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| 279 | </listitem>
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| 280 | </varlistentry>
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[56ab82c] | 281 |
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[dc6715a] | 282 | <varlistentry id="ntptime">
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| 283 | <term><command>ntptime</command></term>
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| 284 | <listitem>
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| 285 | <para>reads and displays time-related kernel variables.</para>
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| 286 | <indexterm zone="ntp ntptime">
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| 287 | <primary sortas="b-ntptime">ntptime</primary>
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| 288 | </indexterm>
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| 289 | </listitem>
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| 290 | </varlistentry>
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[56ab82c] | 291 |
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[dc6715a] | 292 | <varlistentry id="ntptrace">
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| 293 | <term><command>ntptrace</command></term>
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| 294 | <listitem>
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| 295 | <para>traces a chain of NTP servers back to the primary source.</para>
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| 296 | <indexterm zone="ntp ntptrace">
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[56ab82c] | 297 | <primary sortas="b-ntptrace">ntptrace</primary>
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[dc6715a] | 298 | </indexterm>
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| 299 | </listitem>
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| 300 | </varlistentry>
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[56ab82c] | 301 |
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[36474cb] | 302 | <varlistentry id="sntp">
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| 303 | <term><command>sntp</command></term>
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| 304 | <listitem>
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| 305 | <para>is a Simple Network Time Protocol (SNTP) client.</para>
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| 306 | <indexterm zone="ntp sntp">
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| 307 | <primary sortas="b-sntp">sntp</primary>
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| 308 | </indexterm>
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| 309 | </listitem>
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| 310 | </varlistentry>
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| 311 |
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[dc6715a] | 312 | <varlistentry id="tickadj">
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| 313 | <term><command>tickadj</command></term>
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| 314 | <listitem>
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[56ab82c] | 315 | <para>reads, and optionally modifies, several timekeeping-related
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| 316 | variables in older kernels that do not have support for precision
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[dc6715a] | 317 | timekeeping.</para>
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| 318 | <indexterm zone="ntp tickadj">
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| 319 | <primary sortas="b-tickadj">tickadj</primary>
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| 320 | </indexterm>
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| 321 | </listitem>
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| 322 | </varlistentry>
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[56ab82c] | 323 |
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[dc6715a] | 324 | </variablelist>
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[56ab82c] | 325 |
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[dc6715a] | 326 | </sect2>
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[56ab82c] | 327 |
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[39f01ca] | 328 | </sect1>
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