| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
|
|---|
| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|---|
| 3 | "http://www.oasis-open.org/docbook/xml/4.5/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-4.2/ntp-&ntp-version;.tar.gz">
|
|---|
| 8 | <!ENTITY ntp-download-ftp "&gentoo-ftp-repo;/ntp-&ntp-version;.tar.gz">
|
|---|
| 9 | <!ENTITY ntp-md5sum "00df80a84ec9528fcfb09498075525bc">
|
|---|
| 10 | <!ENTITY ntp-size "4.1 MB">
|
|---|
| 11 | <!ENTITY ntp-buildsize "48 MB">
|
|---|
| 12 | <!ENTITY ntp-time "0.5 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 | &lfs76_checked;
|
|---|
| 38 |
|
|---|
| 39 | <bridgehead renderas="sect3">Package Information</bridgehead>
|
|---|
| 40 | <itemizedlist spacing="compact">
|
|---|
| 41 | <listitem>
|
|---|
| 42 | <para>Download (HTTP): <ulink url="&ntp-download-http;"/></para>
|
|---|
| 43 | </listitem>
|
|---|
| 44 | <listitem>
|
|---|
| 45 | <para>Download (FTP): <ulink url="&ntp-download-ftp;"/></para>
|
|---|
| 46 | </listitem>
|
|---|
| 47 | <listitem>
|
|---|
| 48 | <para>Download MD5 sum: &ntp-md5sum;</para>
|
|---|
| 49 | </listitem>
|
|---|
| 50 | <listitem>
|
|---|
| 51 | <para>Download size: &ntp-size;</para>
|
|---|
| 52 | </listitem>
|
|---|
| 53 | <listitem>
|
|---|
| 54 | <para>Estimated disk space required: &ntp-buildsize;</para>
|
|---|
| 55 | </listitem>
|
|---|
| 56 | <listitem>
|
|---|
| 57 | <para>Estimated build time: &ntp-time;</para>
|
|---|
| 58 | </listitem>
|
|---|
| 59 | </itemizedlist>
|
|---|
| 60 |
|
|---|
| 61 | <bridgehead renderas="sect3">ntp Dependencies</bridgehead>
|
|---|
| 62 |
|
|---|
| 63 | <bridgehead renderas="sect4">Optional</bridgehead>
|
|---|
| 64 | <para role="optional">
|
|---|
| 65 | <xref linkend="openssl"/> and
|
|---|
| 66 | <ulink url="http://www.thrysoee.dk/editline/">libedit</ulink>
|
|---|
| 67 | </para>
|
|---|
| 68 |
|
|---|
| 69 | <para condition="html" role="usernotes">User Notes:
|
|---|
| 70 | <ulink url="&blfs-wiki;/ntp"/></para>
|
|---|
| 71 |
|
|---|
| 72 | </sect2>
|
|---|
| 73 |
|
|---|
| 74 | <sect2 role="installation">
|
|---|
| 75 | <title>Installation of ntp</title>
|
|---|
| 76 |
|
|---|
| 77 | <para>
|
|---|
| 78 | There should be a dedicated user and group to take control
|
|---|
| 79 | of the <command>ntpd</command> daemon after it is
|
|---|
| 80 | started. Issue the following commands as the
|
|---|
| 81 | <systemitem class="username">root</systemitem> user:
|
|---|
| 82 | </para>
|
|---|
| 83 |
|
|---|
| 84 | <screen role="root"><userinput>groupadd -g 87 ntp &&
|
|---|
| 85 | useradd -c "Network Time Protocol" -d /var/lib/ntp -u 87 \
|
|---|
| 86 | -g ntp -s /bin/false ntp</userinput></screen>
|
|---|
| 87 |
|
|---|
| 88 | <para>Install <application>ntp</application> by running
|
|---|
| 89 | the following commands:</para>
|
|---|
| 90 |
|
|---|
| 91 | <screen><userinput>./configure --prefix=/usr \
|
|---|
| 92 | --sysconfdir=/etc \
|
|---|
| 93 | --enable-linuxcaps \
|
|---|
| 94 | --with-binsubdir=sbin \
|
|---|
| 95 | --with-lineeditlibs=readline &&
|
|---|
| 96 | make</userinput></screen>
|
|---|
| 97 |
|
|---|
| 98 | <para>To test the results, issue: <command>make check</command>.</para>
|
|---|
| 99 |
|
|---|
| 100 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
|
|---|
| 101 |
|
|---|
| 102 | <screen role="root"><userinput>make install &&
|
|---|
| 103 | install -v -o ntp -g ntp -d /var/lib/ntp &&
|
|---|
| 104 | install -v -m755 -d /usr/share/doc/ntp-&ntp-version; &&
|
|---|
| 105 | cp -v -R html/* /usr/share/doc/ntp-&ntp-version;/</userinput></screen>
|
|---|
| 106 |
|
|---|
| 107 | </sect2>
|
|---|
| 108 |
|
|---|
| 109 | <sect2 role="commands">
|
|---|
| 110 | <title>Command Explanations</title>
|
|---|
| 111 |
|
|---|
| 112 | <para><parameter>--with-binsubdir=sbin</parameter>: This parameter places
|
|---|
| 113 | the administrative programs in <filename
|
|---|
| 114 | class="directory">/usr/sbin</filename>.</para>
|
|---|
| 115 |
|
|---|
| 116 | <para><parameter>--enable-linuxcaps</parameter>: ntpd is run as user
|
|---|
| 117 | ntp, so use Linux capabilities for non-root clock control.</para>
|
|---|
| 118 |
|
|---|
| 119 | <para><option>--with-lineeditlibs=readline</option>: This option enables
|
|---|
| 120 | <application>Readline</application> support for <command>ntpdc</command>
|
|---|
| 121 | and <command>ntpq</command> programs. If omitted,
|
|---|
| 122 | <application>libedit</application> will be used if installed, otherwise no
|
|---|
| 123 | readline capabilites will be compiled.</para>
|
|---|
| 124 |
|
|---|
| 125 | </sect2>
|
|---|
| 126 |
|
|---|
| 127 | <sect2 role="configuration">
|
|---|
| 128 | <title>Configuring ntp</title>
|
|---|
| 129 |
|
|---|
| 130 | <sect3 id="ntp-config">
|
|---|
| 131 | <title>Config Files</title>
|
|---|
| 132 |
|
|---|
| 133 | <para><filename>/etc/ntp.conf</filename></para>
|
|---|
| 134 |
|
|---|
| 135 | <indexterm zone="ntp ntp-config">
|
|---|
| 136 | <primary sortas="e-etc-ntp.conf">/etc/ntp.conf</primary>
|
|---|
| 137 | </indexterm>
|
|---|
| 138 |
|
|---|
| 139 | </sect3>
|
|---|
| 140 |
|
|---|
| 141 | <sect3>
|
|---|
| 142 | <title>Configuration Information</title>
|
|---|
| 143 |
|
|---|
| 144 | <para>The following configuration file defines various ntp servers
|
|---|
| 145 | with open access from different continents. It also creates a
|
|---|
| 146 | drift file where <command>ntpd</command> stores the frequency
|
|---|
| 147 | offset and a pid file to store the <command>ntpd</command> process
|
|---|
| 148 | ID. Since the documentation included with the package is sparse,
|
|---|
| 149 | visit the ntp website at <ulink url="http://www.ntp.org/"/> and
|
|---|
| 150 | <ulink url="http://www.pool.ntp.org/"/> for more information.</para>
|
|---|
| 151 |
|
|---|
| 152 | <screen role="root"><userinput>cat > /etc/ntp.conf << "EOF"
|
|---|
| 153 | <literal># Asia
|
|---|
| 154 | server 0.asia.pool.ntp.org
|
|---|
| 155 |
|
|---|
| 156 | # Australia
|
|---|
| 157 | server 0.oceania.pool.ntp.org
|
|---|
| 158 |
|
|---|
| 159 | # Europe
|
|---|
| 160 | server 0.europe.pool.ntp.org
|
|---|
| 161 |
|
|---|
| 162 | # North America
|
|---|
| 163 | server 0.north-america.pool.ntp.org
|
|---|
| 164 |
|
|---|
| 165 | # South America
|
|---|
| 166 | server 2.south-america.pool.ntp.org
|
|---|
| 167 |
|
|---|
| 168 | driftfile /var/lib/ntp/ntp.drift
|
|---|
| 169 | pidfile /var/run/ntpd.pid</literal>
|
|---|
| 170 | EOF</userinput></screen>
|
|---|
| 171 |
|
|---|
| 172 | </sect3>
|
|---|
| 173 |
|
|---|
| 174 | <sect3 id="ntp-init">
|
|---|
| 175 | <title>Synchronizing the Time</title>
|
|---|
| 176 |
|
|---|
| 177 | <para>There are two options. Option one is to run <command>ntpd</command>
|
|---|
| 178 | continuously and allow it to synchronize the time in a gradual manner. The
|
|---|
| 179 | other option is to run <command>ntpd</command> periodically (using cron)
|
|---|
| 180 | and update the time each time <command>ntpd</command> is scheduled.</para>
|
|---|
| 181 |
|
|---|
| 182 | <para>
|
|---|
| 183 | To start the <command>ntpd</command> daemon at boot,
|
|---|
| 184 | install the systemd unit from the <xref linkend="bootscripts"/>
|
|---|
| 185 | package by running the following command as the
|
|---|
| 186 | <systemitem class="username">root</systemitem> user:
|
|---|
| 187 | </para>
|
|---|
| 188 |
|
|---|
| 189 | <indexterm zone="ntp ntp-init">
|
|---|
| 190 | <primary sortas="f-ntp">ntp</primary>
|
|---|
| 191 | </indexterm>
|
|---|
| 192 |
|
|---|
| 193 | <screen role="root"><userinput>make install-ntpd</userinput></screen>
|
|---|
| 194 |
|
|---|
| 195 | <para>If you prefer to run <command>ntpd</command> periodically, add the
|
|---|
| 196 | following command to <systemitem class="username">root</systemitem>'s
|
|---|
| 197 | <filename>crontab</filename>:</para>
|
|---|
| 198 |
|
|---|
| 199 | <screen><literal>ntpd -q</literal></screen>
|
|---|
| 200 |
|
|---|
| 201 | </sect3>
|
|---|
| 202 |
|
|---|
| 203 | </sect2>
|
|---|
| 204 |
|
|---|
| 205 | <sect2 role="content">
|
|---|
| 206 | <title>Contents</title>
|
|---|
| 207 |
|
|---|
| 208 | <segmentedlist>
|
|---|
| 209 | <segtitle>Installed Programs</segtitle>
|
|---|
| 210 | <segtitle>Installed Libraries</segtitle>
|
|---|
| 211 | <segtitle>Installed Directory</segtitle>
|
|---|
| 212 |
|
|---|
| 213 | <seglistitem>
|
|---|
| 214 | <seg>ntp-keygen, ntp-wait, ntpd, ntpdate, ntpdc, ntpq,
|
|---|
| 215 | ntptime, ntptrace, sntp and tickadj</seg>
|
|---|
| 216 | <seg>None</seg>
|
|---|
| 217 | <seg>/usr/share/doc/ntp-&ntp-version;</seg>
|
|---|
| 218 | </seglistitem>
|
|---|
| 219 | </segmentedlist>
|
|---|
| 220 |
|
|---|
| 221 | <variablelist>
|
|---|
| 222 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
|---|
| 223 | <?dbfo list-presentation="list"?>
|
|---|
| 224 | <?dbhtml list-presentation="table"?>
|
|---|
| 225 |
|
|---|
| 226 | <varlistentry id="ntp-keygen">
|
|---|
| 227 | <term><command>ntp-keygen</command></term>
|
|---|
| 228 | <listitem>
|
|---|
| 229 | <para>generates cryptographic data files used by the NTPv4 authentication
|
|---|
| 230 | and identification schemes.</para>
|
|---|
| 231 | <indexterm zone="ntp ntp-keygen">
|
|---|
| 232 | <primary sortas="b-ntp-keygen">ntp-keygen</primary>
|
|---|
| 233 | </indexterm>
|
|---|
| 234 | </listitem>
|
|---|
| 235 | </varlistentry>
|
|---|
| 236 |
|
|---|
| 237 | <varlistentry id="ntp-wait">
|
|---|
| 238 | <term><command>ntp-wait</command></term>
|
|---|
| 239 | <listitem>
|
|---|
| 240 | <para>is useful at boot time, to delay the boot sequence until
|
|---|
| 241 | <command>ntpd</command> has set the time.</para>
|
|---|
| 242 | <indexterm zone="ntp ntp-wait">
|
|---|
| 243 | <primary sortas="b-ntp-wait">ntp-wait</primary>
|
|---|
| 244 | </indexterm>
|
|---|
| 245 | </listitem>
|
|---|
| 246 | </varlistentry>
|
|---|
| 247 |
|
|---|
| 248 | <varlistentry id="ntpd">
|
|---|
| 249 | <term><command>ntpd</command></term>
|
|---|
| 250 | <listitem>
|
|---|
| 251 | <para>is a ntp daemon that runs in the background and keeps
|
|---|
| 252 | the date and time synchronized based on response from configured
|
|---|
| 253 | ntp servers. It also functions as a ntp server.</para>
|
|---|
| 254 | <indexterm zone="ntp ntpd">
|
|---|
| 255 | <primary sortas="b-ntpd">ntpd</primary>
|
|---|
| 256 | </indexterm>
|
|---|
| 257 | </listitem>
|
|---|
| 258 | </varlistentry>
|
|---|
| 259 |
|
|---|
| 260 | <varlistentry id="ntpdate">
|
|---|
| 261 | <term><command>ntpdate</command></term>
|
|---|
| 262 | <listitem>
|
|---|
| 263 | <para>is a client program that sets the date and time based on
|
|---|
| 264 | the response from an ntp server. This command is deprecated.</para>
|
|---|
| 265 | <indexterm zone="ntp ntpdate">
|
|---|
| 266 | <primary sortas="b-ntpdate">ntpdate</primary>
|
|---|
| 267 | </indexterm>
|
|---|
| 268 | </listitem>
|
|---|
| 269 | </varlistentry>
|
|---|
| 270 |
|
|---|
| 271 | <varlistentry id="ntpdc">
|
|---|
| 272 | <term><command>ntpdc</command></term>
|
|---|
| 273 | <listitem>
|
|---|
| 274 | <para>is used to query the ntp daemon about its current state
|
|---|
| 275 | and to request changes in that state.</para>
|
|---|
| 276 | <indexterm zone="ntp ntpdc">
|
|---|
| 277 | <primary sortas="b-ntpdc">ntpdc</primary>
|
|---|
| 278 | </indexterm>
|
|---|
| 279 | </listitem>
|
|---|
| 280 | </varlistentry>
|
|---|
| 281 |
|
|---|
| 282 | <varlistentry id="ntpq">
|
|---|
| 283 | <term><command>ntpq</command></term>
|
|---|
| 284 | <listitem>
|
|---|
| 285 | <para>is an utility program used to monitor <command>ntpd</command>
|
|---|
| 286 | operations and determine performance.</para>
|
|---|
| 287 | <indexterm zone="ntp ntpq">
|
|---|
| 288 | <primary sortas="b-ntpq">ntpq</primary>
|
|---|
| 289 | </indexterm>
|
|---|
| 290 | </listitem>
|
|---|
| 291 | </varlistentry>
|
|---|
| 292 |
|
|---|
| 293 | <varlistentry id="ntptime">
|
|---|
| 294 | <term><command>ntptime</command></term>
|
|---|
| 295 | <listitem>
|
|---|
| 296 | <para>reads and displays time-related kernel variables.</para>
|
|---|
| 297 | <indexterm zone="ntp ntptime">
|
|---|
| 298 | <primary sortas="b-ntptime">ntptime</primary>
|
|---|
| 299 | </indexterm>
|
|---|
| 300 | </listitem>
|
|---|
| 301 | </varlistentry>
|
|---|
| 302 |
|
|---|
| 303 | <varlistentry id="ntptrace">
|
|---|
| 304 | <term><command>ntptrace</command></term>
|
|---|
| 305 | <listitem>
|
|---|
| 306 | <para>traces a chain of ntp servers back to the primary source.</para>
|
|---|
| 307 | <indexterm zone="ntp ntptrace">
|
|---|
| 308 | <primary sortas="b-ntptrace">ntptrace</primary>
|
|---|
| 309 | </indexterm>
|
|---|
| 310 | </listitem>
|
|---|
| 311 | </varlistentry>
|
|---|
| 312 |
|
|---|
| 313 | <varlistentry id="sntp">
|
|---|
| 314 | <term><command>sntp</command></term>
|
|---|
| 315 | <listitem>
|
|---|
| 316 | <para>is a Simple Network Time Protocol (SNTP) client.</para>
|
|---|
| 317 | <indexterm zone="ntp sntp">
|
|---|
| 318 | <primary sortas="b-sntp">sntp</primary>
|
|---|
| 319 | </indexterm>
|
|---|
| 320 | </listitem>
|
|---|
| 321 | </varlistentry>
|
|---|
| 322 |
|
|---|
| 323 | <varlistentry id="tickadj">
|
|---|
| 324 | <term><command>tickadj</command></term>
|
|---|
| 325 | <listitem>
|
|---|
| 326 | <para>reads, and optionally modifies, several timekeeping-related
|
|---|
| 327 | variables in older kernels that do not have support for precision
|
|---|
| 328 | timekeeping.</para>
|
|---|
| 329 | <indexterm zone="ntp tickadj">
|
|---|
| 330 | <primary sortas="b-tickadj">tickadj</primary>
|
|---|
| 331 | </indexterm>
|
|---|
| 332 | </listitem>
|
|---|
| 333 | </varlistentry>
|
|---|
| 334 |
|
|---|
| 335 | </variablelist>
|
|---|
| 336 |
|
|---|
| 337 | </sect2>
|
|---|
| 338 |
|
|---|
| 339 | </sect1>
|
|---|
