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Last change
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git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@1276 af4574ff-66df-0310-9fd7-8a98e5e911e0
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1 | <sect2>
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2 | <title>Configuring <application>NTP</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, visit the NTP website at
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14 | <ulink url="http://www.ntp.org/"/> for more information.</para>
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15 |
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16 | <screen><userinput>server time-a.nist.gov prefer
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17 | server time-b.nist.gov
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18 | server tick.usno.navy.mil
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19 | driftfile /var/cache/ntp.drift</userinput></screen>
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20 | </sect3>
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21 |
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22 | <sect3><title>Synchronizing the time</title>
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23 |
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24 | <para>There are two options. Option one is to use run <command>ntpd</command>
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25 | continuously and allow it to synchronize the time in a gradual manner. The other
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26 | option is to run <command>ntpd</command> periodically (using cron)
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27 | and update the time each time <command>ntpd</command> is scheduled.</para>
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28 |
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29 | <para>If you choose Option one, then create the bootscript
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30 | <filename>/etc/rc.d/init.d/ntp</filename> and put the start and
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31 | stop symlinks:</para>
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32 | <screen><userinput>#!/bin/bash
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33 | # Begin $rc_base/init.d/ntp
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34 | source /etc/sysconfig/rc
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35 | source $rc_functions
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36 | case "$1" in
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37 | start)
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38 | echo "Starting ntpd..."
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39 | loadproc ntpd
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40 | ;;
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41 | stop)
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42 | echo "Stopping ntpd..."
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43 | killproc ntpd
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44 | ;;
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45 | restart)
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46 | $0 stop
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47 | sleep 1
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48 | $0 start
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49 | ;;
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50 | status)
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51 | statusproc ntpd
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52 | ;;
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53 | *)
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54 | echo "Usage: $0 {start|stop|restart|status}"
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55 | exit 1
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56 | ;;
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57 | esac
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58 | # End $rc_base/init.d/ntp</userinput></screen>
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59 |
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60 | <para>If you prefer to start ntpd periodically, add the following command to
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61 | the root's <filename>crontab</filename>:</para>
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62 | <screen><userinput>ntpd -q</userinput></screen>
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63 |
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64 | </sect3>
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65 |
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66 | </sect2>
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67 |
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