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>server time-a.nist.gov prefer
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18 | server time-b.nist.gov
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19 | server tick.usno.navy.mil
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20 | driftfile /var/cache/ntp.drift</userinput></screen>
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21 | </sect3>
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22 |
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23 | <sect3><title>Synchronizing the time</title>
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24 |
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25 | <para>There are two options. Option one is to use run <command>ntpd</command>
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26 | continuously and allow it to synchronize the time in a gradual manner. The other
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27 | option is to run <command>ntpd</command> periodically (using cron)
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28 | and update the time each time <command>ntpd</command> is scheduled.</para>
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29 |
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30 | <para>If you choose Option one, then create the bootscript
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31 | <filename>/etc/rc.d/init.d/ntp</filename> and put the start and
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32 | stop symlinks:</para>
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33 |
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34 | <screen><userinput><command>cat > /etc/rc.d/init.d/ntp << "EOF"</command>
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35 | #!/bin/sh
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36 | # Begin $rc_base/init.d/ntp
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37 | . /etc/sysconfig/rc
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38 | . $rc_functions
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39 | case "$1" in
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40 | start)
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41 | echo "Starting ntpd..."
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42 | loadproc ntpd
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43 | ;;
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44 | stop)
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45 | echo "Stopping ntpd..."
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46 | killproc ntpd
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47 | ;;
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48 | restart)
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49 | $0 stop
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50 | sleep 1
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51 | $0 start
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52 | ;;
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53 | status)
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54 | statusproc ntpd
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55 | ;;
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56 | *)
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57 | echo "Usage: $0 {start|stop|restart|status}"
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58 | exit 1
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59 | ;;
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60 | esac
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61 | # End $rc_base/init.d/ntp
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62 | <command>EOF
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63 | chmod 755 /etc/rc.d/init.d/ntp &&
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64 | cd /etc/rc.d/init.d &&
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65 | ln -sf ../init.d/ntp ../rc0.d/K46ntp &&
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66 | ln -sf ../init.d/ntp ../rc1.d/K46ntp &&
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67 | ln -sf ../init.d/ntp ../rc2.d/K46ntp &&
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68 | ln -sf ../init.d/ntp ../rc3.d/S26ntp &&
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69 | ln -sf ../init.d/ntp ../rc4.d/S26ntp &&
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70 | ln -sf ../init.d/ntp ../rc5.d/S26ntp &&
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71 | ln -sf ../init.d/ntp ../rc6.d/K46ntp</command></userinput></screen>
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72 |
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73 | <para>If you prefer to start ntpd periodically, add the following command to
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74 | the root's <filename>crontab</filename>:</para>
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75 | <screen><userinput>ntpd -q</userinput></screen>
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76 |
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77 | </sect3>
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78 |
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79 | </sect2>
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