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369af35a2a
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@1776 af4574ff-66df-0310-9fd7-8a98e5e911e0
80 lines
2.6 KiB
XML
80 lines
2.6 KiB
XML
<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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servers to use with the primary server designated with the prefer tag. 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>server time-a.nist.gov prefer
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server time-b.nist.gov
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server tick.usno.navy.mil
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driftfile /var/cache/ntp.drift</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 use run <command>ntpd</command>
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continuously and allow it to synchronize the time in a gradual manner. The other
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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 create the bootscript
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<filename>/etc/rc.d/init.d/ntp</filename> and put the start and
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stop symlinks:</para>
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<screen><userinput><command>cat > /etc/rc.d/init.d/ntp << "EOF"</command>
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#!/bin/sh
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# Begin $rc_base/init.d/ntp
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. /etc/sysconfig/rc
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. $rc_functions
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case "$1" in
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start)
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echo "Starting ntpd..."
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loadproc ntpd
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;;
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stop)
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echo "Stopping ntpd..."
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killproc ntpd
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;;
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restart)
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$0 stop
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sleep 1
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$0 start
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;;
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status)
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statusproc ntpd
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;;
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*)
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echo "Usage: $0 {start|stop|restart|status}"
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exit 1
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;;
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esac
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# End $rc_base/init.d/ntp
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<command>EOF
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chmod 755 /etc/rc.d/init.d/ntp &&
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cd /etc/rc.d/init.d &&
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ln -sf ../init.d/ntp ../rc0.d/K46ntp &&
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ln -sf ../init.d/ntp ../rc1.d/K46ntp &&
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ln -sf ../init.d/ntp ../rc2.d/K46ntp &&
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ln -sf ../init.d/ntp ../rc3.d/S26ntp &&
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ln -sf ../init.d/ntp ../rc4.d/S26ntp &&
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ln -sf ../init.d/ntp ../rc5.d/S26ntp &&
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ln -sf ../init.d/ntp ../rc6.d/K46ntp</command></userinput></screen>
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<para>If you prefer to start ntpd periodically, add the following command to
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the root's <filename>crontab</filename>:</para>
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<screen><userinput>ntpd -q</userinput></screen>
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</sect3>
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</sect2>
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