[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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[ac38e9dc] | 7 | <!ENTITY ntp-download-http "https://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-&ntp-version;.tar.gz">
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| 8 | <!-- <!ENTITY ntp-download-ftp "&gentoo-ftp-repo;/ntp-&ntp-version;.tar.gz">-->
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| 9 | <!ENTITY ntp-download-ftp " ">
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[3d6e95d] | 10 | <!ENTITY ntp-md5sum "4a8636260435b230636f053ffd070e34">
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| 11 | <!ENTITY ntp-size "6.9 MB">
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| 12 | <!ENTITY ntp-buildsize "102 MB (with tests)">
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[d7bee48] | 13 | <!ENTITY ntp-time "0.8 SBU (with tests)">
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[d47e7ea9] | 14 | ]>
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| 15 |
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[286c613d] | 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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[286c613d] | 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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[286c613d] | 27 | <primary sortas="a-ntp">ntp</primary>
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[dc6715a] | 28 | </indexterm>
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| 29 |
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| 30 | <sect2 role="package">
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[286c613d] | 31 | <title>Introduction to ntp</title>
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[56ab82c] | 32 |
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[286c613d] | 33 | <para>The <application>ntp</application> package contains a
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[56ab82c] | 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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[d8aa38f0] | 38 | &lfs79_checked;
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[6564aa1] | 39 |
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[dc6715a] | 40 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 41 | <itemizedlist spacing="compact">
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| 42 | <listitem>
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| 43 | <para>Download (HTTP): <ulink url="&ntp-download-http;"/></para>
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| 44 | </listitem>
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| 45 | <listitem>
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| 46 | <para>Download (FTP): <ulink url="&ntp-download-ftp;"/></para>
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| 47 | </listitem>
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| 48 | <listitem>
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| 49 | <para>Download MD5 sum: &ntp-md5sum;</para>
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| 50 | </listitem>
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| 51 | <listitem>
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| 52 | <para>Download size: &ntp-size;</para>
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| 53 | </listitem>
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| 54 | <listitem>
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| 55 | <para>Estimated disk space required: &ntp-buildsize;</para>
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| 56 | </listitem>
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| 57 | <listitem>
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[2174baa] | 58 | <para>Estimated build time: &ntp-time;</para>
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| 59 | </listitem>
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[dc6715a] | 60 | </itemizedlist>
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[56ab82c] | 61 |
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[286c613d] | 62 | <bridgehead renderas="sect3">ntp Dependencies</bridgehead>
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[56ab82c] | 63 |
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[ac38e9dc] | 64 | <bridgehead renderas="sect4">Required</bridgehead>
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| 65 | <para role="required">
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| 66 | <xref linkend="wget"/> (runtime, for <command>update-leap</command>) and
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| 67 | <xref linkend="which"/>
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| 68 | </para>
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| 69 |
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[dc6715a] | 70 | <bridgehead renderas="sect4">Optional</bridgehead>
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[03f32bb] | 71 | <para role="optional">
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[b91aa96] | 72 | <xref linkend="libcap-pam"/>,
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[ac38e9dc] | 73 | <xref linkend="libevent"/>,
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| 74 | <xref linkend="openssl"/>,
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| 75 | <ulink url="http://www.thrysoee.dk/editline/">libedit</ulink>, and
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[b91aa96] | 76 | <ulink url="https://www.gnu.org/software/autogen/">libopts from
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| 77 | AutoGen</ulink>
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[03f32bb] | 78 | </para>
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[56ab82c] | 79 |
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[061ec9d] | 80 | <para condition="html" role="usernotes">User Notes:
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| 81 | <ulink url="&blfs-wiki;/ntp"/></para>
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| 82 |
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[dc6715a] | 83 | </sect2>
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[56ab82c] | 84 |
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[dc6715a] | 85 | <sect2 role="installation">
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[286c613d] | 86 | <title>Installation of ntp</title>
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[dc6715a] | 87 |
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[e38cfca] | 88 | <para>
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| 89 | There should be a dedicated user and group to take control
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| 90 | of the <command>ntpd</command> daemon after it is
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| 91 | started. Issue the following commands as the
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| 92 | <systemitem class="username">root</systemitem> user:
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| 93 | </para>
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| 94 |
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| 95 | <screen role="root"><userinput>groupadd -g 87 ntp &&
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| 96 | useradd -c "Network Time Protocol" -d /var/lib/ntp -u 87 \
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| 97 | -g ntp -s /bin/false ntp</userinput></screen>
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| 98 |
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[286c613d] | 99 | <para>Install <application>ntp</application> by running
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[dc6715a] | 100 | the following commands:</para>
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| 101 |
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[f82ac3f] | 102 | <screen><userinput>./configure --prefix=/usr \
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[ac38e9dc] | 103 | --bindir=/usr/sbin \
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[2dcc08c0] | 104 | --sysconfdir=/etc \
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| 105 | --enable-linuxcaps \
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[ac38e9dc] | 106 | --with-lineeditlibs=readline \
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| 107 | --docdir=/usr/share/doc/ntp-&ntp-version; &&
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[11cf9f2] | 108 | make</userinput></screen>
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| 109 |
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[b91aa96] | 110 | <para>To test the results, issue: <command>make check</command>.</para>
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[56ab82c] | 111 |
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[11cf9f2] | 112 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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[56ab82c] | 113 |
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[339fbfb9] | 114 | <screen role="root"><userinput>make install &&
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[b91aa96] | 115 | install -v -o ntp -g ntp -d /var/lib/ntp</userinput></screen>
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[36474cb] | 116 |
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| 117 | </sect2>
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| 118 |
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| 119 | <sect2 role="commands">
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| 120 | <title>Command Explanations</title>
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| 121 |
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[ac38e9dc] | 122 | <para><parameter>--bindir=/usr/sbin</parameter>: This parameter places
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[36474cb] | 123 | the administrative programs in <filename
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| 124 | class="directory">/usr/sbin</filename>.</para>
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[11cf9f2] | 125 |
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[2dcc08c0] | 126 | <para><parameter>--enable-linuxcaps</parameter>: ntpd is run as user
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| 127 | ntp, so use Linux capabilities for non-root clock control.</para>
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| 128 |
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[a01b1bf] | 129 | <para><option>--with-lineeditlibs=readline</option>: This option enables
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| 130 | <application>Readline</application> support for <command>ntpdc</command>
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| 131 | and <command>ntpq</command> programs. If omitted,
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| 132 | <application>libedit</application> will be used if installed, otherwise no
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| 133 | readline capabilites will be compiled.</para>
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| 134 |
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[dc6715a] | 135 | </sect2>
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[56ab82c] | 136 |
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[dc6715a] | 137 | <sect2 role="configuration">
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[286c613d] | 138 | <title>Configuring ntp</title>
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[56ab82c] | 139 |
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[dc6715a] | 140 | <sect3 id="ntp-config">
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| 141 | <title>Config Files</title>
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[56ab82c] | 142 |
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[dc6715a] | 143 | <para><filename>/etc/ntp.conf</filename></para>
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[56ab82c] | 144 |
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[dc6715a] | 145 | <indexterm zone="ntp ntp-config">
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| 146 | <primary sortas="e-etc-ntp.conf">/etc/ntp.conf</primary>
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| 147 | </indexterm>
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[56ab82c] | 148 |
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[dc6715a] | 149 | </sect3>
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[56ab82c] | 150 |
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[dc6715a] | 151 | <sect3>
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| 152 | <title>Configuration Information</title>
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| 153 |
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[ac38e9dc] | 154 | <para>The following configuration file first defines various ntp
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| 155 | servers with open access from different continents. Second, it
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| 156 | creates a drift file where <command>ntpd</command> stores the
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| 157 | frequency offset and a pid file to store the
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| 158 | <command>ntpd</command> process ID. Third, it defines the location
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| 159 | for the leap-second definition file
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| 160 | <filename>/etc/ntp.leapseconds</filename>, that the
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[b91aa96] | 161 | <command>update-leap</command> script checks and updates, when
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[ac38e9dc] | 162 | necessary. This script can be run as a cron job and the
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| 163 | <application>ntp</application> developers recommend a frequency of
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| 164 | about three weeks for the updates. Since the documentation included
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| 165 | with the package is sparse, visit the ntp website at
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| 166 | <ulink url="http://www.ntp.org/"/> and
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[a88b03e] | 167 | <ulink url="http://www.pool.ntp.org/"/> for more information.</para>
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[dc6715a] | 168 |
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| 169 | <screen role="root"><userinput>cat > /etc/ntp.conf << "EOF"
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[6e26273] | 170 | <literal># Asia
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[bca6dfb6] | 171 | server 0.asia.pool.ntp.org
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[d47e7ea9] | 172 |
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| 173 | # Australia
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[bca6dfb6] | 174 | server 0.oceania.pool.ntp.org
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[56ab82c] | 175 |
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[d47e7ea9] | 176 | # Europe
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[ea57941f] | 177 | server 0.europe.pool.ntp.org
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[d47e7ea9] | 178 |
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| 179 | # North America
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[ea57941f] | 180 | server 0.north-america.pool.ntp.org
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| 181 |
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| 182 | # South America
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[bca6dfb6] | 183 | server 2.south-america.pool.ntp.org
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[d47e7ea9] | 184 |
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[1e72251e] | 185 | driftfile /var/lib/ntp/ntp.drift
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[ac38e9dc] | 186 | pidfile /var/run/ntpd.pid
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| 187 |
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| 188 | leapfile /etc/ntp.leapseconds</literal>
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| 189 | EOF</userinput></screen>
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| 190 |
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| 191 | <para>
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[b91aa96] | 192 | You may wish to add a <quote>Security session</quote>. For
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| 193 | explanations, see
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| 194 | <ulink url="https://www.eecis.udel.edu/~mills/ntp/html/accopt.html#restrict"/>.
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| 195 | </para>
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[ac38e9dc] | 196 |
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| 197 | <screen role="root"><userinput>cat >> /etc/ntp.conf << "EOF"
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| 198 | <literal># Security session
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| 199 | restrict default limited kod nomodify notrap nopeer noquery
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| 200 | restrict -6 default limited kod nomodify notrap nopeer noquery
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| 201 |
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| 202 | restrict 127.0.0.1
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| 203 | restrict ::1</literal>
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[dc6715a] | 204 | EOF</userinput></screen>
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| 205 |
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| 206 | </sect3>
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[56ab82c] | 207 |
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[dc6715a] | 208 | <sect3 id="ntp-init">
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| 209 | <title>Synchronizing the Time</title>
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| 210 |
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| 211 | <para>There are two options. Option one is to run <command>ntpd</command>
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[56ab82c] | 212 | continuously and allow it to synchronize the time in a gradual manner. The
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[dc6715a] | 213 | other option is to run <command>ntpd</command> periodically (using cron)
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| 214 | and update the time each time <command>ntpd</command> is scheduled.</para>
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[56ab82c] | 215 |
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[0da88ea3] | 216 | <para>
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| 217 | To start the <command>ntpd</command> daemon at boot,
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| 218 | install the systemd unit from the <xref linkend="bootscripts"/>
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| 219 | package by running the following command as the
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| 220 | <systemitem class="username">root</systemitem> user:
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| 221 | </para>
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[56ab82c] | 222 |
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| 223 | <indexterm zone="ntp ntp-init">
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[dc6715a] | 224 | <primary sortas="f-ntp">ntp</primary>
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[56ab82c] | 225 | </indexterm>
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[dc6715a] | 226 |
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[286c613d] | 227 | <screen role="root"><userinput>make install-ntpd</userinput></screen>
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[dc6715a] | 228 |
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[56ab82c] | 229 | <para>If you prefer to run <command>ntpd</command> periodically, add the
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| 230 | following command to <systemitem class="username">root</systemitem>'s
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[dc6715a] | 231 | <filename>crontab</filename>:</para>
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[56ab82c] | 232 |
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[dc6715a] | 233 | <screen><literal>ntpd -q</literal></screen>
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| 234 |
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| 235 | </sect3>
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[56ab82c] | 236 |
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[dc6715a] | 237 | </sect2>
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[56ab82c] | 238 |
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[dc6715a] | 239 | <sect2 role="content">
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| 240 | <title>Contents</title>
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[56ab82c] | 241 |
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[dc6715a] | 242 | <segmentedlist>
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| 243 | <segtitle>Installed Programs</segtitle>
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| 244 | <segtitle>Installed Libraries</segtitle>
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[ac38e9dc] | 245 | <segtitle>Installed Directories</segtitle>
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[56ab82c] | 246 |
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[dc6715a] | 247 | <seglistitem>
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[ac38e9dc] | 248 | <seg>calc_tickadj, ntp-keygen, ntp-wait, ntpd, ntpdate, ntpdc, ntpq,
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| 249 | ntptime, ntptrace, sntp, tickadj and update-leap</seg>
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[dc6715a] | 250 | <seg>None</seg>
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[ac38e9dc] | 251 | <seg>/usr/share/ntp,
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| 252 | /usr/share/doc/ntp-4.2.8 and
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| 253 | /var/lib/ntp</seg>
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[dc6715a] | 254 | </seglistitem>
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| 255 | </segmentedlist>
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[56ab82c] | 256 |
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[dc6715a] | 257 | <variablelist>
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| 258 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 259 | <?dbfo list-presentation="list"?>
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| 260 | <?dbhtml list-presentation="table"?>
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[56ab82c] | 261 |
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[ac38e9dc] | 262 | <varlistentry id="calc_tickadj">
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| 263 | <term><command>calc_tickadj</command></term>
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| 264 | <listitem>
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| 265 | <para>calculates optimal value for tick given ntp drift file.</para>
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| 266 | <indexterm zone="ntp calc_tickadj">
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| 267 | <primary sortas="b-calc_tickadj">calc_tickadj</primary>
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| 268 | </indexterm>
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| 269 | </listitem>
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| 270 | </varlistentry>
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| 271 |
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[dc6715a] | 272 | <varlistentry id="ntp-keygen">
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| 273 | <term><command>ntp-keygen</command></term>
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| 274 | <listitem>
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[56ab82c] | 275 | <para>generates cryptographic data files used by the NTPv4 authentication
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[dc6715a] | 276 | and identification schemes.</para>
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| 277 | <indexterm zone="ntp ntp-keygen">
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| 278 | <primary sortas="b-ntp-keygen">ntp-keygen</primary>
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| 279 | </indexterm>
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| 280 | </listitem>
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| 281 | </varlistentry>
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[56ab82c] | 282 |
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[dc6715a] | 283 | <varlistentry id="ntp-wait">
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| 284 | <term><command>ntp-wait</command></term>
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| 285 | <listitem>
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[56ab82c] | 286 | <para>is useful at boot time, to delay the boot sequence until
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[dc6715a] | 287 | <command>ntpd</command> has set the time.</para>
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| 288 | <indexterm zone="ntp ntp-wait">
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| 289 | <primary sortas="b-ntp-wait">ntp-wait</primary>
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| 290 | </indexterm>
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| 291 | </listitem>
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| 292 | </varlistentry>
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[56ab82c] | 293 |
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[dc6715a] | 294 | <varlistentry id="ntpd">
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| 295 | <term><command>ntpd</command></term>
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| 296 | <listitem>
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[286c613d] | 297 | <para>is a ntp daemon that runs in the background and keeps
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[56ab82c] | 298 | the date and time synchronized based on response from configured
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[286c613d] | 299 | ntp servers. It also functions as a ntp server.</para>
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[dc6715a] | 300 | <indexterm zone="ntp ntpd">
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| 301 | <primary sortas="b-ntpd">ntpd</primary>
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| 302 | </indexterm>
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| 303 | </listitem>
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| 304 | </varlistentry>
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[56ab82c] | 305 |
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[dc6715a] | 306 | <varlistentry id="ntpdate">
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| 307 | <term><command>ntpdate</command></term>
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| 308 | <listitem>
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[56ab82c] | 309 | <para>is a client program that sets the date and time based on
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[286c613d] | 310 | the response from an ntp server. This command is deprecated.</para>
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[dc6715a] | 311 | <indexterm zone="ntp ntpdate">
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| 312 | <primary sortas="b-ntpdate">ntpdate</primary>
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| 313 | </indexterm>
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| 314 | </listitem>
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| 315 | </varlistentry>
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[56ab82c] | 316 |
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[dc6715a] | 317 | <varlistentry id="ntpdc">
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| 318 | <term><command>ntpdc</command></term>
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| 319 | <listitem>
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[286c613d] | 320 | <para>is used to query the ntp daemon about its current state
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[dc6715a] | 321 | and to request changes in that state.</para>
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| 322 | <indexterm zone="ntp ntpdc">
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| 323 | <primary sortas="b-ntpdc">ntpdc</primary>
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| 324 | </indexterm>
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| 325 | </listitem>
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| 326 | </varlistentry>
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[56ab82c] | 327 |
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[dc6715a] | 328 | <varlistentry id="ntpq">
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| 329 | <term><command>ntpq</command></term>
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| 330 | <listitem>
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[cb0bbd2] | 331 | <para>is a utility program used to monitor <command>ntpd</command>
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[dc6715a] | 332 | operations and determine performance.</para>
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| 333 | <indexterm zone="ntp ntpq">
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| 334 | <primary sortas="b-ntpq">ntpq</primary>
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| 335 | </indexterm>
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| 336 | </listitem>
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| 337 | </varlistentry>
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[56ab82c] | 338 |
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[dc6715a] | 339 | <varlistentry id="ntptime">
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| 340 | <term><command>ntptime</command></term>
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| 341 | <listitem>
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| 342 | <para>reads and displays time-related kernel variables.</para>
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| 343 | <indexterm zone="ntp ntptime">
|
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| 344 | <primary sortas="b-ntptime">ntptime</primary>
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| 345 | </indexterm>
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| 346 | </listitem>
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| 347 | </varlistentry>
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[56ab82c] | 348 |
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[dc6715a] | 349 | <varlistentry id="ntptrace">
|
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| 350 | <term><command>ntptrace</command></term>
|
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| 351 | <listitem>
|
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[286c613d] | 352 | <para>traces a chain of ntp servers back to the primary source.</para>
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[dc6715a] | 353 | <indexterm zone="ntp ntptrace">
|
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[56ab82c] | 354 | <primary sortas="b-ntptrace">ntptrace</primary>
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[dc6715a] | 355 | </indexterm>
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| 356 | </listitem>
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| 357 | </varlistentry>
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[56ab82c] | 358 |
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[36474cb] | 359 | <varlistentry id="sntp">
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| 360 | <term><command>sntp</command></term>
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| 361 | <listitem>
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| 362 | <para>is a Simple Network Time Protocol (SNTP) client.</para>
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| 363 | <indexterm zone="ntp sntp">
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| 364 | <primary sortas="b-sntp">sntp</primary>
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| 365 | </indexterm>
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| 366 | </listitem>
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| 367 | </varlistentry>
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| 368 |
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[dc6715a] | 369 | <varlistentry id="tickadj">
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| 370 | <term><command>tickadj</command></term>
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| 371 | <listitem>
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[56ab82c] | 372 | <para>reads, and optionally modifies, several timekeeping-related
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| 373 | variables in older kernels that do not have support for precision
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[dc6715a] | 374 | timekeeping.</para>
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| 375 | <indexterm zone="ntp tickadj">
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| 376 | <primary sortas="b-tickadj">tickadj</primary>
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| 377 | </indexterm>
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| 378 | </listitem>
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| 379 | </varlistentry>
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[56ab82c] | 380 |
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[ac38e9dc] | 381 | <varlistentry id="update-leap">
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| 382 | <term><command>update-leap</command></term>
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| 383 | <listitem>
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| 384 | <para>is a script to verify and, if necessary, update the leap-second
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| 385 | definition file.</para>
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| 386 | <indexterm zone="ntp update-leap">
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| 387 | <primary sortas="b-update-leap">update-leap</primary>
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| 388 | </indexterm>
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| 389 | </listitem>
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| 390 | </varlistentry>
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| 391 |
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[dc6715a] | 392 | </variablelist>
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[56ab82c] | 393 |
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[dc6715a] | 394 | </sect2>
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[56ab82c] | 395 |
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[39f01ca] | 396 | </sect1>
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