| 1 | <sect2>
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| 2 | <title>Configuring <application><acronym>NTP</acronym></application></title>
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| 3 |
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| 4 | <sect3><title>Config files</title>
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| 5 | <para><filename>/etc/ntp.conf</filename></para>
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| 6 | </sect3>
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| 7 |
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| 8 | <sect3><title>Configuration Information</title>
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| 9 |
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| 10 | <para>The following configuration file defines various <acronym>NTP</acronym>
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| 11 | servers to use with the primary server designated with the prefer tag. It also
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| 12 | creates a drift file where <command>ntpd</command> stores the frequency
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| 13 | offset. Since the documentation included with the package is sparse,
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| 14 | visit the <acronym>NTP</acronym> website at
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| 15 | <ulink url="http://www.ntp.org/"/> for more information.</para>
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| 16 |
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| 17 | <screen><userinput><command>cat > /etc/ntp.conf << "EOF"</command>
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| 18 | server time-a.nist.gov prefer
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| 19 | server time-b.nist.gov
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| 20 | server tick.usno.navy.mil
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| 21 | driftfile /var/cache/ntp.drift
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| 22 | <command>EOF</command></userinput></screen>
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| 23 | </sect3>
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| 24 |
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| 25 | <sect3><title>Synchronizing the time</title>
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| 26 |
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| 27 | <para>There are two options. Option one is to use run <command>ntpd</command>
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| 28 | continuously and allow it to synchronize the time in a gradual manner. The other
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| 29 | option is to run <command>ntpd</command> periodically (using cron)
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| 30 | and update the time each time <command>ntpd</command> is scheduled.</para>
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| 31 |
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| 32 | <para>If you choose Option one, then create the bootscript
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| 33 | <filename>/etc/rc.d/init.d/ntp</filename> and put the start and
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| 34 | stop symlinks:</para>
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| 35 |
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| 36 | <screen><userinput><command>cat > /etc/rc.d/init.d/ntp << "EOF"</command>
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| 37 | #!/bin/sh
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| 38 | # Begin $rc_base/init.d/ntp
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| 39 | . /etc/sysconfig/rc
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| 40 | . $rc_functions
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| 41 | case "$1" in
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| 42 | start)
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| 43 | echo "Starting ntpd..."
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| 44 | loadproc ntpd
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| 45 | ;;
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| 46 | stop)
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| 47 | echo "Stopping ntpd..."
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| 48 | killproc ntpd
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| 49 | ;;
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| 50 | restart)
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| 51 | $0 stop
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| 52 | sleep 1
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| 53 | $0 start
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| 54 | ;;
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| 55 | status)
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| 56 | statusproc ntpd
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| 57 | ;;
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| 58 | *)
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| 59 | echo "Usage: $0 {start|stop|restart|status}"
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| 60 | exit 1
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| 61 | ;;
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| 62 | esac
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| 63 | # End $rc_base/init.d/ntp
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| 64 | <command>EOF
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| 65 | chmod 755 /etc/rc.d/init.d/ntp &&
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| 66 | cd /etc/rc.d/init.d &&
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| 67 | ln -sf ../init.d/ntp ../rc0.d/K46ntp &&
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| 68 | ln -sf ../init.d/ntp ../rc1.d/K46ntp &&
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| 69 | ln -sf ../init.d/ntp ../rc2.d/K46ntp &&
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| 70 | ln -sf ../init.d/ntp ../rc3.d/S26ntp &&
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| 71 | ln -sf ../init.d/ntp ../rc4.d/S26ntp &&
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| 72 | ln -sf ../init.d/ntp ../rc5.d/S26ntp &&
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| 73 | ln -sf ../init.d/ntp ../rc6.d/K46ntp</command></userinput></screen>
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| 74 |
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| 75 | <para>If you prefer to start ntpd periodically, add the following command to
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| 76 | the root's <filename>crontab</filename>:</para>
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| 77 | <screen><userinput>ntpd -q</userinput></screen>
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| 78 |
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| 79 | </sect3>
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| 80 |
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| 81 | </sect2>
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