| 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 "https://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-&ntp-version;.tar.gz">
|
|---|
| 8 | <!ENTITY ntp-download-ftp " ">
|
|---|
| 9 | <!ENTITY ntp-md5sum "e1e6b23d2fc75cced41801dbcd6c2561">
|
|---|
| 10 | <!ENTITY ntp-size "6.7 MB">
|
|---|
| 11 | <!ENTITY ntp-buildsize "108 MB (with tests)">
|
|---|
| 12 | <!ENTITY ntp-time "0.4 SBU (Using parallelism=4; with tests)">
|
|---|
| 13 | ]>
|
|---|
| 14 |
|
|---|
| 15 | <sect1 id="ntp" xreflabel="ntp-&ntp-version;">
|
|---|
| 16 | <?dbhtml filename="ntp.html"?>
|
|---|
| 17 |
|
|---|
| 18 |
|
|---|
| 19 | <title>ntp-&ntp-version;</title>
|
|---|
| 20 |
|
|---|
| 21 | <indexterm zone="ntp">
|
|---|
| 22 | <primary sortas="a-ntp">ntp</primary>
|
|---|
| 23 | </indexterm>
|
|---|
| 24 |
|
|---|
| 25 | <sect2 role="package">
|
|---|
| 26 | <title>Introduction to ntp</title>
|
|---|
| 27 |
|
|---|
| 28 | <para>
|
|---|
| 29 | The <application>ntp</application> package contains a client and server
|
|---|
| 30 | to keep the time synchronized between various computers over
|
|---|
| 31 | a network. This package is the official reference implementation of the
|
|---|
| 32 | NTP protocol.
|
|---|
| 33 | </para>
|
|---|
| 34 |
|
|---|
| 35 | &lfs112_checked;
|
|---|
| 36 |
|
|---|
| 37 | <bridgehead renderas="sect3">Package Information</bridgehead>
|
|---|
| 38 | <itemizedlist spacing="compact">
|
|---|
| 39 | <listitem>
|
|---|
| 40 | <para>
|
|---|
| 41 | Download (HTTP): <ulink url="&ntp-download-http;"/>
|
|---|
| 42 | </para>
|
|---|
| 43 | </listitem>
|
|---|
| 44 | <listitem>
|
|---|
| 45 | <para>
|
|---|
| 46 | Download (FTP): <ulink url="&ntp-download-ftp;"/>
|
|---|
| 47 | </para>
|
|---|
| 48 | </listitem>
|
|---|
| 49 | <listitem>
|
|---|
| 50 | <para>
|
|---|
| 51 | Download MD5 sum: &ntp-md5sum;
|
|---|
| 52 | </para>
|
|---|
| 53 | </listitem>
|
|---|
| 54 | <listitem>
|
|---|
| 55 | <para>
|
|---|
| 56 | Download size: &ntp-size;
|
|---|
| 57 | </para>
|
|---|
| 58 | </listitem>
|
|---|
| 59 | <listitem>
|
|---|
| 60 | <para>
|
|---|
| 61 | Estimated disk space required: &ntp-buildsize;
|
|---|
| 62 | </para>
|
|---|
| 63 | </listitem>
|
|---|
| 64 | <listitem>
|
|---|
| 65 | <para>
|
|---|
| 66 | Estimated build time: &ntp-time;
|
|---|
| 67 | </para>
|
|---|
| 68 | </listitem>
|
|---|
| 69 | </itemizedlist>
|
|---|
| 70 |
|
|---|
| 71 | <bridgehead renderas="sect3">ntp Dependencies</bridgehead>
|
|---|
| 72 |
|
|---|
| 73 | <bridgehead renderas="sect4">Required</bridgehead>
|
|---|
| 74 | <para role="required">
|
|---|
| 75 | <xref linkend="perl-io-socket-ssl"/>
|
|---|
| 76 | </para>
|
|---|
| 77 |
|
|---|
| 78 | <!-- Tested 4.2.8p11 with neither wget nor lynx on system: Not required.
|
|---|
| 79 | <bridgehead renderas="sect4">Recommended</bridgehead>
|
|---|
| 80 | <para role="recommended">
|
|---|
| 81 | <xref role="runtime" linkend="wget"/> (runtime, for
|
|---|
| 82 | <command>update-leap</command>)
|
|---|
| 83 | <!- - The download code for update-leap uses the File::Fetch perl module,
|
|---|
| 84 | which may use wget, or lynx, or some core perl modules, so maybe move
|
|---|
| 85 | to optional - ->
|
|---|
| 86 | </para>
|
|---|
| 87 | -->
|
|---|
| 88 | <bridgehead renderas="sect4">Optional</bridgehead>
|
|---|
| 89 | <para role="optional">
|
|---|
| 90 | <xref linkend="libcap-pam"/>,
|
|---|
| 91 | <xref linkend="libevent"/>,
|
|---|
| 92 | <ulink url="https://www.thrysoee.dk/editline/">libedit</ulink>, and
|
|---|
| 93 | <ulink url="https://www.gnu.org/software/autogen/">libopts from AutoGen</ulink>
|
|---|
| 94 | </para>
|
|---|
| 95 |
|
|---|
| 96 | <para condition="html" role="usernotes">User Notes:
|
|---|
| 97 | <ulink url="&blfs-wiki;/ntp"/></para>
|
|---|
| 98 |
|
|---|
| 99 | </sect2>
|
|---|
| 100 |
|
|---|
| 101 | <sect2 role="installation">
|
|---|
| 102 | <title>Installation of ntp</title>
|
|---|
| 103 |
|
|---|
| 104 | <para>
|
|---|
| 105 | There should be a dedicated user and group to take control
|
|---|
| 106 | of the <command>ntpd</command> daemon after it is
|
|---|
| 107 | started. Issue the following commands as the
|
|---|
| 108 | <systemitem class="username">root</systemitem> user:
|
|---|
| 109 | </para>
|
|---|
| 110 |
|
|---|
| 111 | <screen role="root"><userinput>groupadd -g 87 ntp &&
|
|---|
| 112 | useradd -c "Network Time Protocol" -d /var/lib/ntp -u 87 \
|
|---|
| 113 | -g ntp -s /bin/false ntp</userinput></screen>
|
|---|
| 114 |
|
|---|
| 115 | <!-- At least one of the issues has been reported upstream. The next para
|
|---|
| 116 | is valid for 4.8.2p10 -->
|
|---|
| 117 | <para>
|
|---|
| 118 | The <command>update-leap</command> command needs to be fixed in order
|
|---|
| 119 | to run properly:
|
|---|
| 120 | </para>
|
|---|
| 121 |
|
|---|
| 122 | <screen><userinput>sed -e 's/"(\\S+)"/"?([^\\s"]+)"?/' \
|
|---|
| 123 | -i scripts/update-leap/update-leap.in</userinput></screen>
|
|---|
| 124 |
|
|---|
| 125 | <para>
|
|---|
| 126 | Now fix an issue introduced with glibc-2.34:
|
|---|
| 127 | </para>
|
|---|
| 128 |
|
|---|
| 129 | <screen><userinput>sed -e 's/#ifndef __sun/#if !defined(__sun) \&\& !defined(__GLIBC__)/' \
|
|---|
| 130 | -i libntp/work_thread.c</userinput></screen>
|
|---|
| 131 |
|
|---|
| 132 | <para>
|
|---|
| 133 | Install <application>ntp</application> by running
|
|---|
| 134 | the following commands:
|
|---|
| 135 | </para>
|
|---|
| 136 |
|
|---|
| 137 | <screen><userinput>./configure --prefix=/usr \
|
|---|
| 138 | --bindir=/usr/sbin \
|
|---|
| 139 | --sysconfdir=/etc \
|
|---|
| 140 | --enable-linuxcaps \
|
|---|
| 141 | --with-lineeditlibs=readline \
|
|---|
| 142 | --docdir=/usr/share/doc/ntp-&ntp-version; &&
|
|---|
| 143 | make</userinput></screen>
|
|---|
| 144 |
|
|---|
| 145 | <!-- https://bugs.ntp.org/show_bug.cgi?id=3688
|
|---|
| 146 | It should be fixed in the next ntp release. -->
|
|---|
| 147 | <para>The test suite of this package is broken with GCC 10 or later.</para>
|
|---|
| 148 |
|
|---|
| 149 | <!--
|
|---|
| 150 | <para>
|
|---|
| 151 | To test the results, issue: <command>make check</command>.
|
|---|
| 152 | </para>
|
|---|
| 153 | -->
|
|---|
| 154 |
|
|---|
| 155 | <para>
|
|---|
| 156 | Now, as the <systemitem class="username">root</systemitem> user:
|
|---|
| 157 | </para>
|
|---|
| 158 |
|
|---|
| 159 | <screen role="root"><userinput>make install &&
|
|---|
| 160 | install -v -o ntp -g ntp -d /var/lib/ntp</userinput></screen>
|
|---|
| 161 |
|
|---|
| 162 | </sect2>
|
|---|
| 163 |
|
|---|
| 164 | <sect2 role="commands">
|
|---|
| 165 | <title>Command Explanations</title>
|
|---|
| 166 |
|
|---|
| 167 | <para>
|
|---|
| 168 | <envar>CFLAGS="-O2 -g -fPIC"</envar>: This environment variable
|
|---|
| 169 | is necessary to generate Position Independent Code needed for
|
|---|
| 170 | use in the package libraries.
|
|---|
| 171 | </para>
|
|---|
| 172 |
|
|---|
| 173 | <para>
|
|---|
| 174 | <parameter>--bindir=/usr/sbin</parameter>: This parameter places
|
|---|
| 175 | the administrative programs in <filename
|
|---|
| 176 | class="directory">/usr/sbin</filename>.
|
|---|
| 177 | </para>
|
|---|
| 178 |
|
|---|
| 179 | <para>
|
|---|
| 180 | <parameter>--enable-linuxcaps</parameter>: ntpd is run as user
|
|---|
| 181 | ntp, so use Linux capabilities for non-root clock control.
|
|---|
| 182 | </para>
|
|---|
| 183 |
|
|---|
| 184 | <para>
|
|---|
| 185 | <parameter>--with-lineeditlibs=readline</parameter>: This switch
|
|---|
| 186 | enables <application>Readline</application> support for
|
|---|
| 187 | <command>ntpdc</command> and <command>ntpq</command> programs. If omitted,
|
|---|
| 188 | <application>libedit</application> will be used if installed, otherwise no
|
|---|
| 189 | readline capabilities will be compiled.
|
|---|
| 190 | </para>
|
|---|
| 191 |
|
|---|
| 192 | </sect2>
|
|---|
| 193 |
|
|---|
| 194 | <sect2 role="configuration">
|
|---|
| 195 | <title>Configuring ntp</title>
|
|---|
| 196 |
|
|---|
| 197 | <sect3 id="ntp-config">
|
|---|
| 198 | <title>Config Files</title>
|
|---|
| 199 |
|
|---|
| 200 | <para>
|
|---|
| 201 | <filename>/etc/ntp.conf</filename>
|
|---|
| 202 | </para>
|
|---|
| 203 |
|
|---|
| 204 | <indexterm zone="ntp ntp-config">
|
|---|
| 205 | <primary sortas="e-etc-ntp.conf">/etc/ntp.conf</primary>
|
|---|
| 206 | </indexterm>
|
|---|
| 207 |
|
|---|
| 208 | </sect3>
|
|---|
| 209 |
|
|---|
| 210 | <sect3>
|
|---|
| 211 | <title>Configuration Information</title>
|
|---|
| 212 |
|
|---|
| 213 | <para>
|
|---|
| 214 | The following configuration file first defines various ntp
|
|---|
| 215 | servers with open access from different continents. Second, it
|
|---|
| 216 | creates a drift file where <command>ntpd</command> stores the
|
|---|
| 217 | frequency offset and a pid file to store the
|
|---|
| 218 | <command>ntpd</command> process ID. Third, it defines the location
|
|---|
| 219 | for the leap-second definition file
|
|---|
| 220 | <filename>/etc/ntp.leapseconds</filename>, that the
|
|---|
| 221 | <command>update-leap</command> script checks and updates, when
|
|---|
| 222 | necessary. This script can be run as a cron job and the
|
|---|
| 223 | <application>ntp</application> developers recommend a frequency of
|
|---|
| 224 | about three weeks for the updates. Since the documentation included
|
|---|
| 225 | with the package is sparse, visit the ntp website at
|
|---|
| 226 | <ulink url="https://www.ntp.org/"/> and
|
|---|
| 227 | <ulink url="https://www.ntppool.org/"/> for more information.
|
|---|
| 228 | </para>
|
|---|
| 229 |
|
|---|
| 230 | <screen role="root"><userinput>cat > /etc/ntp.conf << "EOF"
|
|---|
| 231 | <literal># Asia
|
|---|
| 232 | server 0.asia.pool.ntp.org
|
|---|
| 233 |
|
|---|
| 234 | # Australia
|
|---|
| 235 | server 0.oceania.pool.ntp.org
|
|---|
| 236 |
|
|---|
| 237 | # Europe
|
|---|
| 238 | server 0.europe.pool.ntp.org
|
|---|
| 239 |
|
|---|
| 240 | # North America
|
|---|
| 241 | server 0.north-america.pool.ntp.org
|
|---|
| 242 |
|
|---|
| 243 | # South America
|
|---|
| 244 | server 2.south-america.pool.ntp.org
|
|---|
| 245 |
|
|---|
| 246 | driftfile /var/lib/ntp/ntp.drift
|
|---|
| 247 | pidfile /run/ntpd.pid
|
|---|
| 248 |
|
|---|
| 249 | leapfile /var/lib/ntp/ntp.leapseconds</literal>
|
|---|
| 250 | EOF</userinput></screen>
|
|---|
| 251 |
|
|---|
| 252 | <para>
|
|---|
| 253 | You may wish to add a <quote>Security session</quote>. For
|
|---|
| 254 | explanations, see <ulink url=
|
|---|
| 255 | "https://www.eecis.udel.edu/~mills/ntp/html/accopt.html#restrict"/>.
|
|---|
| 256 | </para>
|
|---|
| 257 |
|
|---|
| 258 | <screen role="root"><userinput>cat >> /etc/ntp.conf << "EOF"
|
|---|
| 259 | <literal># Security session
|
|---|
| 260 | restrict default limited kod nomodify notrap nopeer noquery
|
|---|
| 261 | restrict -6 default limited kod nomodify notrap nopeer noquery
|
|---|
| 262 |
|
|---|
| 263 | restrict 127.0.0.1
|
|---|
| 264 | restrict ::1</literal>
|
|---|
| 265 | EOF</userinput></screen>
|
|---|
| 266 |
|
|---|
| 267 | </sect3>
|
|---|
| 268 |
|
|---|
| 269 | <sect3 id="ntp-init">
|
|---|
| 270 | <title>Synchronizing the Time</title>
|
|---|
| 271 |
|
|---|
| 272 | <para>
|
|---|
| 273 | There are two options. Option one is to run <command>ntpd</command>
|
|---|
| 274 | continuously and allow it to synchronize the time in a gradual manner.
|
|---|
| 275 | The other option is to run <command>ntpd</command> periodically (using
|
|---|
| 276 | cron) and update the time each time <command>ntpd</command> is
|
|---|
| 277 | scheduled.
|
|---|
| 278 | </para>
|
|---|
| 279 |
|
|---|
| 280 | <para>
|
|---|
| 281 | If you choose Option one, then install the
|
|---|
| 282 | <phrase revision="sysv"><filename>/etc/rc.d/init.d/ntp</filename>
|
|---|
| 283 | init script</phrase>
|
|---|
| 284 | <phrase revision="systemd"><filename>ntpd.service</filename>
|
|---|
| 285 | unit</phrase>
|
|---|
| 286 | included in the
|
|---|
| 287 | <xref linkend="bootscripts" revision="sysv"/>
|
|---|
| 288 | <xref linkend="systemd-units" revision="systemd"/> package.
|
|---|
| 289 | </para>
|
|---|
| 290 |
|
|---|
| 291 | <indexterm zone="ntp ntp-init" revision="sysv">
|
|---|
| 292 | <primary sortas="f-ntp">ntp</primary>
|
|---|
| 293 | </indexterm>
|
|---|
| 294 |
|
|---|
| 295 | <indexterm zone="ntp ntp-init" revision="systemd">
|
|---|
| 296 | <primary sortas="f-ntpd">ntpd.service</primary>
|
|---|
| 297 | </indexterm>
|
|---|
| 298 |
|
|---|
| 299 | <screen role="root"><userinput>make install-ntpd</userinput></screen>
|
|---|
| 300 |
|
|---|
| 301 | <para>
|
|---|
| 302 | If you prefer to run <command>ntpd</command> periodically, add the
|
|---|
| 303 | following command to <systemitem class="username">root</systemitem>'s
|
|---|
| 304 | <filename>crontab</filename>:
|
|---|
| 305 | </para>
|
|---|
| 306 |
|
|---|
| 307 | <screen><literal>ntpd -q</literal></screen>
|
|---|
| 308 |
|
|---|
| 309 | <para revision="sysv">
|
|---|
| 310 | Execute the following command if you would like to set the hardware
|
|---|
| 311 | clock to the current system time at shutdown and reboot:
|
|---|
| 312 | </para>
|
|---|
| 313 |
|
|---|
| 314 | <screen role="root" revision="sysv"><userinput>ln -v -sf ../init.d/setclock /etc/rc.d/rc0.d/K46setclock &&
|
|---|
| 315 | ln -v -sf ../init.d/setclock /etc/rc.d/rc6.d/K46setclock</userinput></screen>
|
|---|
| 316 |
|
|---|
| 317 | <para revision="sysv">
|
|---|
| 318 | The other way around is already set up by LFS.
|
|---|
| 319 | </para>
|
|---|
| 320 |
|
|---|
| 321 | </sect3>
|
|---|
| 322 |
|
|---|
| 323 | </sect2>
|
|---|
| 324 |
|
|---|
| 325 | <sect2 role="content">
|
|---|
| 326 | <title>Contents</title>
|
|---|
| 327 |
|
|---|
| 328 | <segmentedlist>
|
|---|
| 329 | <segtitle>Installed Programs</segtitle>
|
|---|
| 330 | <segtitle>Installed Libraries</segtitle>
|
|---|
| 331 | <segtitle>Installed Directories</segtitle>
|
|---|
| 332 |
|
|---|
| 333 | <seglistitem>
|
|---|
| 334 | <seg>calc_tickadj, ntp-keygen, ntp-wait, ntpd, ntpdate, ntpdc, ntpq,
|
|---|
| 335 | ntptime, ntptrace, sntp, tickadj and update-leap</seg>
|
|---|
| 336 | <seg>None</seg>
|
|---|
| 337 | <seg>/usr/share/ntp,
|
|---|
| 338 | /usr/share/doc/ntp-4.2.8 and
|
|---|
| 339 | /var/lib/ntp</seg>
|
|---|
| 340 | </seglistitem>
|
|---|
| 341 | </segmentedlist>
|
|---|
| 342 |
|
|---|
| 343 | <variablelist>
|
|---|
| 344 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
|
|---|
| 345 | <?dbfo list-presentation="list"?>
|
|---|
| 346 | <?dbhtml list-presentation="table"?>
|
|---|
| 347 |
|
|---|
| 348 | <varlistentry id="calc_tickadj">
|
|---|
| 349 | <term><command>calc_tickadj</command></term>
|
|---|
| 350 | <listitem>
|
|---|
| 351 | <para>
|
|---|
| 352 | calculates optimal value for tick given ntp drift file
|
|---|
| 353 | </para>
|
|---|
| 354 | <indexterm zone="ntp calc_tickadj">
|
|---|
| 355 | <primary sortas="b-calc_tickadj">calc_tickadj</primary>
|
|---|
| 356 | </indexterm>
|
|---|
| 357 | </listitem>
|
|---|
| 358 | </varlistentry>
|
|---|
| 359 |
|
|---|
| 360 | <varlistentry id="ntp-keygen">
|
|---|
| 361 | <term><command>ntp-keygen</command></term>
|
|---|
| 362 | <listitem>
|
|---|
| 363 | <para>
|
|---|
| 364 | generates cryptographic data files used by the NTPv4 authentication
|
|---|
| 365 | and identification schemes
|
|---|
| 366 | </para>
|
|---|
| 367 | <indexterm zone="ntp ntp-keygen">
|
|---|
| 368 | <primary sortas="b-ntp-keygen">ntp-keygen</primary>
|
|---|
| 369 | </indexterm>
|
|---|
| 370 | </listitem>
|
|---|
| 371 | </varlistentry>
|
|---|
| 372 |
|
|---|
| 373 | <varlistentry id="ntp-wait">
|
|---|
| 374 | <term><command>ntp-wait</command></term>
|
|---|
| 375 | <listitem>
|
|---|
| 376 | <para>
|
|---|
| 377 | is useful at boot time, to delay the boot sequence until
|
|---|
| 378 | <command>ntpd</command> has set the time
|
|---|
| 379 | </para>
|
|---|
| 380 | <indexterm zone="ntp ntp-wait">
|
|---|
| 381 | <primary sortas="b-ntp-wait">ntp-wait</primary>
|
|---|
| 382 | </indexterm>
|
|---|
| 383 | </listitem>
|
|---|
| 384 | </varlistentry>
|
|---|
| 385 |
|
|---|
| 386 | <varlistentry id="ntpd">
|
|---|
| 387 | <term><command>ntpd</command></term>
|
|---|
| 388 | <listitem>
|
|---|
| 389 | <para>
|
|---|
| 390 | is a ntp daemon that runs in the background and keeps
|
|---|
| 391 | the date and time synchronized based on response from configured
|
|---|
| 392 | ntp servers. It also functions as a ntp server
|
|---|
| 393 | </para>
|
|---|
| 394 | <indexterm zone="ntp ntpd">
|
|---|
| 395 | <primary sortas="b-ntpd">ntpd</primary>
|
|---|
| 396 | </indexterm>
|
|---|
| 397 | </listitem>
|
|---|
| 398 | </varlistentry>
|
|---|
| 399 |
|
|---|
| 400 | <varlistentry id="ntpdate">
|
|---|
| 401 | <term><command>ntpdate</command></term>
|
|---|
| 402 | <listitem>
|
|---|
| 403 | <para>
|
|---|
| 404 | is a client program that sets the date and time based on
|
|---|
| 405 | the response from an ntp server. This command is deprecated
|
|---|
| 406 | </para>
|
|---|
| 407 | <indexterm zone="ntp ntpdate">
|
|---|
| 408 | <primary sortas="b-ntpdate">ntpdate</primary>
|
|---|
| 409 | </indexterm>
|
|---|
| 410 | </listitem>
|
|---|
| 411 | </varlistentry>
|
|---|
| 412 |
|
|---|
| 413 | <varlistentry id="ntpdc">
|
|---|
| 414 | <term><command>ntpdc</command></term>
|
|---|
| 415 | <listitem>
|
|---|
| 416 | <para>
|
|---|
| 417 | is used to query the ntp daemon about its current state
|
|---|
| 418 | and to request changes in that state
|
|---|
| 419 | </para>
|
|---|
| 420 | <indexterm zone="ntp ntpdc">
|
|---|
| 421 | <primary sortas="b-ntpdc">ntpdc</primary>
|
|---|
| 422 | </indexterm>
|
|---|
| 423 | </listitem>
|
|---|
| 424 | </varlistentry>
|
|---|
| 425 |
|
|---|
| 426 | <varlistentry id="ntpq">
|
|---|
| 427 | <term><command>ntpq</command></term>
|
|---|
| 428 | <listitem>
|
|---|
| 429 | <para>
|
|---|
| 430 | is a utility program used to monitor <command>ntpd</command>
|
|---|
| 431 | operations and determine performance
|
|---|
| 432 | </para>
|
|---|
| 433 | <indexterm zone="ntp ntpq">
|
|---|
| 434 | <primary sortas="b-ntpq">ntpq</primary>
|
|---|
| 435 | </indexterm>
|
|---|
| 436 | </listitem>
|
|---|
| 437 | </varlistentry>
|
|---|
| 438 |
|
|---|
| 439 | <varlistentry id="ntptime">
|
|---|
| 440 | <term><command>ntptime</command></term>
|
|---|
| 441 | <listitem>
|
|---|
| 442 | <para>
|
|---|
| 443 | reads and displays time-related kernel variables
|
|---|
| 444 | </para>
|
|---|
| 445 | <indexterm zone="ntp ntptime">
|
|---|
| 446 | <primary sortas="b-ntptime">ntptime</primary>
|
|---|
| 447 | </indexterm>
|
|---|
| 448 | </listitem>
|
|---|
| 449 | </varlistentry>
|
|---|
| 450 |
|
|---|
| 451 | <varlistentry id="ntptrace">
|
|---|
| 452 | <term><command>ntptrace</command></term>
|
|---|
| 453 | <listitem>
|
|---|
| 454 | <para>
|
|---|
| 455 | traces a chain of ntp servers back to the primary source
|
|---|
| 456 | </para>
|
|---|
| 457 | <indexterm zone="ntp ntptrace">
|
|---|
| 458 | <primary sortas="b-ntptrace">ntptrace</primary>
|
|---|
| 459 | </indexterm>
|
|---|
| 460 | </listitem>
|
|---|
| 461 | </varlistentry>
|
|---|
| 462 |
|
|---|
| 463 | <varlistentry id="sntp">
|
|---|
| 464 | <term><command>sntp</command></term>
|
|---|
| 465 | <listitem>
|
|---|
| 466 | <para>
|
|---|
| 467 | is a Simple Network Time Protocol (SNTP) client
|
|---|
| 468 | </para>
|
|---|
| 469 | <indexterm zone="ntp sntp">
|
|---|
| 470 | <primary sortas="b-sntp">sntp</primary>
|
|---|
| 471 | </indexterm>
|
|---|
| 472 | </listitem>
|
|---|
| 473 | </varlistentry>
|
|---|
| 474 |
|
|---|
| 475 | <varlistentry id="tickadj">
|
|---|
| 476 | <term><command>tickadj</command></term>
|
|---|
| 477 | <listitem>
|
|---|
| 478 | <para>
|
|---|
| 479 | reads, and optionally modifies, several timekeeping-related
|
|---|
| 480 | variables in older kernels that do not have support for precision
|
|---|
| 481 | timekeeping
|
|---|
| 482 | </para>
|
|---|
| 483 | <indexterm zone="ntp tickadj">
|
|---|
| 484 | <primary sortas="b-tickadj">tickadj</primary>
|
|---|
| 485 | </indexterm>
|
|---|
| 486 | </listitem>
|
|---|
| 487 | </varlistentry>
|
|---|
| 488 |
|
|---|
| 489 | <varlistentry id="update-leap">
|
|---|
| 490 | <term><command>update-leap</command></term>
|
|---|
| 491 | <listitem>
|
|---|
| 492 | <para>
|
|---|
| 493 | is a script to verify and, if necessary, update the leap-second
|
|---|
| 494 | definition file
|
|---|
| 495 | </para>
|
|---|
| 496 | <indexterm zone="ntp update-leap">
|
|---|
| 497 | <primary sortas="b-update-leap">update-leap</primary>
|
|---|
| 498 | </indexterm>
|
|---|
| 499 | </listitem>
|
|---|
| 500 | </varlistentry>
|
|---|
| 501 |
|
|---|
| 502 | </variablelist>
|
|---|
| 503 |
|
|---|
| 504 | </sect2>
|
|---|
| 505 |
|
|---|
| 506 | </sect1>
|
|---|
