source: basicnet/netprogs/ntp.xml@ 11cf9f2

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Last change on this file since 11cf9f2 was 11cf9f2, checked in by Igor Živković <igor@…>, 18 years ago

Added a test suite note to NTP.

git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@3964 af4574ff-66df-0310-9fd7-8a98e5e911e0

  • Property mode set to 100644
File size: 9.4 KB
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1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
3 "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../../general.ent">
5 %general-entities;
6
7 <!ENTITY ntp-download-http "http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-&ntp-version;.tar.gz">
8 <!ENTITY ntp-download-ftp "ftp://ftp.udel.edu/pub/ntp/ntp4/ntp-&ntp-version;.tar.gz">
9 <!ENTITY ntp-md5sum "0f8fabe87cf54f409b57c6283f0c0c3d">
10 <!ENTITY ntp-size "2.4 MB">
11 <!ENTITY ntp-buildsize "27 MB">
12 <!ENTITY ntp-time "0.53 SBU">
13]>
14
15<sect1 id="ntp" xreflabel="NTP-&ntp-version;">
16 <?dbhtml filename="ntp.html"?>
17
18 <sect1info>
19 <othername>$LastChangedBy$</othername>
20 <date>$Date$</date>
21 </sect1info>
22
23 <title>NTP-&ntp-version;</title>
24
25 <indexterm zone="ntp">
26 <primary sortas="a-NTP">NTP</primary>
27 </indexterm>
28
29 <sect2 role="package">
30 <title>Introduction to NTP</title>
31
32 <para>The <application>NTP</application> package contains a
33 client and server to keep the time synchronized between various computers over
34 a network. This package is the official reference implementation of the
35 NTP protocol.</para>
36
37 <bridgehead renderas="sect3">Package Information</bridgehead>
38 <itemizedlist spacing="compact">
39 <listitem>
40 <para>Download (HTTP): <ulink url="&ntp-download-http;"/></para>
41 </listitem>
42 <listitem>
43 <para>Download (FTP): <ulink url="&ntp-download-ftp;"/></para>
44 </listitem>
45 <listitem>
46 <para>Download MD5 sum: &ntp-md5sum;</para>
47 </listitem>
48 <listitem>
49 <para>Download size: &ntp-size;</para>
50 </listitem>
51 <listitem>
52 <para>Estimated disk space required: &ntp-buildsize;</para>
53 </listitem>
54 <listitem>
55 <para>Estimated build time: &ntp-time;</para>
56 </listitem>
57 </itemizedlist>
58
59 <bridgehead renderas="sect3">NTP Dependencies</bridgehead>
60
61 <bridgehead renderas="sect4">Optional</bridgehead>
62 <para><xref linkend="openssl"/></para>
63
64 </sect2>
65
66 <sect2 role="installation">
67 <title>Installation of NTP</title>
68
69 <para>Install <application>NTP</application> by running
70 the following commands:</para>
71
72<screen><userinput>./configure --prefix=/usr --bindir=/usr/sbin \
73 --sysconfdir=/etc &amp;&amp;
74make</userinput></screen>
75
76 <para>To test the results, issue: <command>make check</command>.</para>
77
78 <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
79
80<screen role="root"><userinput>make install</userinput></screen>
81
82 </sect2>
83
84 <sect2 role="configuration">
85 <title>Configuring NTP</title>
86
87 <sect3 id="ntp-config">
88 <title>Config Files</title>
89
90 <para><filename>/etc/ntp.conf</filename></para>
91
92 <indexterm zone="ntp ntp-config">
93 <primary sortas="e-etc-ntp.conf">/etc/ntp.conf</primary>
94 </indexterm>
95
96 </sect3>
97
98 <sect3>
99 <title>Configuration Information</title>
100
101 <para>The following configuration file defines various NTP
102 stratum 2 servers with open access from different continents. It also
103 creates a drift file where <command>ntpd</command> stores the frequency
104 offset. Since the documentation included with the package is sparse,
105 visit the NTP website at <ulink url="http://www.ntp.org/"/> for more information.</para>
106
107<screen role="root"><userinput>cat &gt; /etc/ntp.conf &lt;&lt; "EOF"
108<literal># Africa
109server tock.nml.csir.co.za
110
111# Asia
112server ntp.shim.org
113
114# Australia
115server ntp.saard.net
116
117# Europe
118server ntp.tuxfamily.net
119
120# North America
121server clock.psu.edu
122
123driftfile /var/cache/ntp.drift</literal>
124EOF</userinput></screen>
125
126 </sect3>
127
128 <sect3 id="ntp-init">
129 <title>Synchronizing the Time</title>
130
131 <para>There are two options. Option one is to run <command>ntpd</command>
132 continuously and allow it to synchronize the time in a gradual manner. The
133 other option is to run <command>ntpd</command> periodically (using cron)
134 and update the time each time <command>ntpd</command> is scheduled.</para>
135
136 <para>If you choose Option one, then install the
137 <filename>/etc/rc.d/init.d/ntp</filename>
138 init script included in the
139 <xref linkend="intro-important-bootscripts"/> package.</para>
140
141 <indexterm zone="ntp ntp-init">
142 <primary sortas="f-ntp">ntp</primary>
143 </indexterm>
144
145<screen role="root"><userinput>make install-ntp</userinput></screen>
146
147 <para>If you prefer to run <command>ntpd</command> periodically, add the
148 following command to <systemitem class="username">root</systemitem>'s
149 <filename>crontab</filename>:</para>
150
151<screen><literal>ntpd -q</literal></screen>
152
153 <para>Execute the following command if you would like to set the
154 hardware clock at shutdown and reboot based on the current system
155 time:</para>
156
157<screen role="root"><userinput>ln -v -sf ../init.d/setclock /etc/rc.d/rc0.d/K46setclock &amp;&amp;
158ln -v -sf ../init.d/setclock /etc/rc.d/rc6.d/K46setclock</userinput></screen>
159
160 <para>The other way around is already set up by LFS.</para>
161
162 </sect3>
163
164 </sect2>
165
166 <sect2 role="content">
167 <title>Contents</title>
168
169 <segmentedlist>
170 <segtitle>Installed Programs</segtitle>
171 <segtitle>Installed Libraries</segtitle>
172 <segtitle>Installed Directories</segtitle>
173
174 <seglistitem>
175 <seg>ntp-keygen, ntp-wait, ntpd, ntpdate, ntpdc, ntpq,
176 ntptime, ntptrace, and tickadj</seg>
177 <seg>None</seg>
178 <seg>None</seg>
179 </seglistitem>
180 </segmentedlist>
181
182 <variablelist>
183 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
184 <?dbfo list-presentation="list"?>
185 <?dbhtml list-presentation="table"?>
186
187 <varlistentry id="ntp-keygen">
188 <term><command>ntp-keygen</command></term>
189 <listitem>
190 <para>generates cryptographic data files used by the NTPv4 authentication
191 and identification schemes.</para>
192 <indexterm zone="ntp ntp-keygen">
193 <primary sortas="b-ntp-keygen">ntp-keygen</primary>
194 </indexterm>
195 </listitem>
196 </varlistentry>
197
198 <varlistentry id="ntp-wait">
199 <term><command>ntp-wait</command></term>
200 <listitem>
201 <para>is useful at boot time, to delay the boot sequence until
202 <command>ntpd</command> has set the time.</para>
203 <indexterm zone="ntp ntp-wait">
204 <primary sortas="b-ntp-wait">ntp-wait</primary>
205 </indexterm>
206 </listitem>
207 </varlistentry>
208
209 <varlistentry id="ntpd">
210 <term><command>ntpd</command></term>
211 <listitem>
212 <para>is a NTP daemon that runs in the background and keeps
213 the date and time synchronized based on response from configured
214 NTP servers. It also functions as a NTP server.</para>
215 <indexterm zone="ntp ntpd">
216 <primary sortas="b-ntpd">ntpd</primary>
217 </indexterm>
218 </listitem>
219 </varlistentry>
220
221 <varlistentry id="ntpdate">
222 <term><command>ntpdate</command></term>
223 <listitem>
224 <para>is a client program that sets the date and time based on
225 the response from an NTP server. This command is deprecated.</para>
226 <indexterm zone="ntp ntpdate">
227 <primary sortas="b-ntpdate">ntpdate</primary>
228 </indexterm>
229 </listitem>
230 </varlistentry>
231
232 <varlistentry id="ntpdc">
233 <term><command>ntpdc</command></term>
234 <listitem>
235 <para>is used to query the NTP daemon about its current state
236 and to request changes in that state.</para>
237 <indexterm zone="ntp ntpdc">
238 <primary sortas="b-ntpdc">ntpdc</primary>
239 </indexterm>
240 </listitem>
241 </varlistentry>
242
243 <varlistentry id="ntpq">
244 <term><command>ntpq</command></term>
245 <listitem>
246 <para>is an utility program used to monitor <command>ntpd</command>
247 operations and determine performance.</para>
248 <indexterm zone="ntp ntpq">
249 <primary sortas="b-ntpq">ntpq</primary>
250 </indexterm>
251 </listitem>
252 </varlistentry>
253
254 <varlistentry id="ntptime">
255 <term><command>ntptime</command></term>
256 <listitem>
257 <para>reads and displays time-related kernel variables.</para>
258 <indexterm zone="ntp ntptime">
259 <primary sortas="b-ntptime">ntptime</primary>
260 </indexterm>
261 </listitem>
262 </varlistentry>
263
264 <varlistentry id="ntptrace">
265 <term><command>ntptrace</command></term>
266 <listitem>
267 <para>traces a chain of NTP servers back to the primary source.</para>
268 <indexterm zone="ntp ntptrace">
269 <primary sortas="b-ntptrace"></primary>
270 </indexterm>
271 </listitem>
272 </varlistentry>
273
274 <varlistentry id="tickadj">
275 <term><command>tickadj</command></term>
276 <listitem>
277 <para>reads, and optionally modifies, several timekeeping-related
278 variables in older kernels that do not have support for precision
279 timekeeping.</para>
280 <indexterm zone="ntp tickadj">
281 <primary sortas="b-tickadj">tickadj</primary>
282 </indexterm>
283 </listitem>
284 </varlistentry>
285
286 </variablelist>
287
288 </sect2>
289
290</sect1>
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