mirror of
https://github.com/Zeckmathederg/glfs.git
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f5f7f9d980
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@3439 af4574ff-66df-0310-9fd7-8a98e5e911e0
196 lines
6.5 KiB
XML
196 lines
6.5 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
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"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../../general.ent">
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%general-entities;
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<!ENTITY ntp-download-http "http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-&ntp-version;.tar.gz">
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<!ENTITY ntp-download-ftp "ftp://ftp.udel.edu/pub/ntp/ntp4/ntp-&ntp-version;.tar.gz">
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<!ENTITY ntp-md5sum "0f8fabe87cf54f409b57c6283f0c0c3d">
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<!ENTITY ntp-size "2.4 MB">
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<!ENTITY ntp-buildsize "27 MB">
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<!ENTITY ntp-time "0.53 SBU">
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]>
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<sect1 id="ntp" xreflabel="NTP-&ntp-version;">
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<sect1info>
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<othername>$LastChangedBy$</othername>
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<date>$Date$</date>
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</sect1info>
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<?dbhtml filename="ntp.html"?>
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<title>NTP-&ntp-version;</title>
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<sect2>
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<title>Introduction to <application><acronym>NTP</acronym></application></title>
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<para>The <application><acronym>NTP</acronym></application> package contains a
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client and server to keep the time synchronized between various computers over
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a network. This package is the official reference implementation of the
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<acronym>NTP</acronym> protocol.</para>
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<sect3><title>Package information</title>
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<itemizedlist spacing='compact'>
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<listitem><para>Download (HTTP):
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<ulink url="&ntp-download-http;"/></para></listitem>
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<listitem><para>Download (FTP):
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<ulink url="&ntp-download-ftp;"/></para></listitem>
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<listitem><para>Download MD5 sum: &ntp-md5sum;</para></listitem>
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<listitem><para>Download size: &ntp-size;</para></listitem>
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<listitem><para>Estimated disk space required:
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&ntp-buildsize;</para></listitem>
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<listitem><para>Estimated build time:
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&ntp-time;</para></listitem></itemizedlist>
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</sect3>
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<sect3><title><application><acronym>NTP</acronym></application>
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dependencies</title>
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<sect4><title>Optional</title>
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<para><xref linkend="openssl"/></para>
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</sect4>
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</sect3>
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</sect2>
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<sect2>
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<title>Installation of <application><acronym>NTP</acronym></application></title>
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<para>Install <application><acronym>NTP</acronym></application> by running
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the following commands:</para>
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<screen><userinput><command>./configure --prefix=/usr --bindir=/usr/sbin \
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--sysconfdir=/etc &&
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make &&
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make install</command></userinput></screen>
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</sect2>
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<sect2>
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<title>Configuring <application><acronym>NTP</acronym></application></title>
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<sect3><title>Config files</title>
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<para><filename>/etc/ntp.conf</filename></para>
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</sect3>
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<sect3><title>Configuration Information</title>
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<para>The following configuration file defines various <acronym>NTP</acronym>
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stratum 2 servers with open access from different continents. It also
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creates a drift file where <command>ntpd</command> stores the frequency
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offset. Since the documentation included with the package is sparse,
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visit the <acronym>NTP</acronym> website at
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<ulink url="http://www.ntp.org/"/> for more information.</para>
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<screen><userinput><command>cat > /etc/ntp.conf << "EOF"</command>
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# Africa
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server tock.nml.csir.co.za
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# Asia
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server ntp.shim.org
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# Australia
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server ntp.saard.net
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# Europe
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server ntp.tuxfamily.net
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# North America
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server clock.psu.edu
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driftfile /var/cache/ntp.drift
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<command>EOF</command></userinput></screen>
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</sect3>
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<sect3><title>Synchronizing the time</title>
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<para>There are two options. Option one is to run <command>ntpd</command>
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continuously and allow it to synchronize the time in a gradual manner. The
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other option is to run <command>ntpd</command> periodically (using cron)
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and update the time each time <command>ntpd</command> is scheduled.</para>
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<para>If you choose Option one, then install the
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<filename>/etc/rc.d/init.d/ntp</filename>
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init script included in the
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<xref linkend="intro-important-bootscripts"/> package.</para>
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<screen><userinput><command>make install-ntp</command></userinput></screen>
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<para>If you prefer to run ntpd periodically, add the following command to
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root's <filename>crontab</filename>:</para>
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<screen><userinput>ntpd -q</userinput></screen>
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<para>Execute the following command if you would like to set the
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hardware clock at shutdown and reboot based on the current system
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time:</para>
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<screen><userinput><command>ln -sf ../init.d/setclock /etc/rc.d/rc0.d/K46setclock &&
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ln -sf ../init.d/setclock /etc/rc.d/rc6.d/K46setclock</command></userinput></screen>
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<para>The other way around is already set up by
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<acronym>LFS</acronym>.</para>
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</sect3>
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</sect2>
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<sect2>
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<title>Contents</title>
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<para>The <application><acronym>NTP</acronym></application> package
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contains <command>ntp-wait</command>, <command>ntptrace</command>,
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<command>ntpd</command>, <command>ntpdate</command>,
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<command>ntpdc</command>, <command>ntpq</command>,
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<command>ntptime</command>, <command>tickadj</command> and
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<command>ntp-keygen</command>.</para>
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</sect2>
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<sect2><title>Description</title>
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<sect3><title>ntp-wait</title>
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<para><command>ntp-wait</command> is useful at boot time, to delay the
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boot sequence until <command>ntpd</command> has set the
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time.</para></sect3>
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<sect3><title>ntptrace</title>
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<para><command>ntptrace</command> traces a chain of
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<acronym>NTP</acronym> servers back to the primary source.</para></sect3>
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<sect3><title>ntpd</title>
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<para><command>ntpd</command> is a NTP daemon that runs in the
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background and keeps the date and time synchronized based on response
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from configured <acronym>NTP</acronym> servers. It also functions as a
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<acronym>NTP</acronym> server.</para></sect3>
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<sect3><title>ntpdate</title>
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<para><command>ntpdate</command> is a client program that sets the date
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and time based on the response from an <acronym>NTP</acronym> server.
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This command is deprecated.</para></sect3>
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<sect3><title>ntpdc</title>
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<para><command>ntpdc</command> is used to query the
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<acronym>NTP</acronym> daemon about its current state and to request
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changes in that state.</para></sect3>
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<sect3><title>ntpq</title>
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<para><command>ntpq</command> is an utility program used to monitor
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<command>ntpd</command> operations and determine
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performance.</para></sect3>
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<sect3><title>ntptime</title>
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<para><command>ntptime</command> reads and displays time-related
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kernel variables.</para></sect3>
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<sect3><title>tickadj</title>
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<para><command>tickadj</command> reads, and optionally modifies,
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several timekeeping-related variables in older kernels that do not have
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support for precision timekeeping.</para></sect3>
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<sect3><title>ntp-keygen</title>
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<para><command>ntp-keygen</command> generates cryptographic data files
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used by the <acronym>NTP</acronym>v4 authentication and identification
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schemes.</para></sect3>
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</sect2>
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</sect1>
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