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 | stratum 2 servers with open access from different continents. 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 | # Africa
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19 | server tock.nml.csir.co.za
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20 |
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21 | # Asia
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22 | server ntp.shim.org
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23 |
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24 | # Australia
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25 | server ntp.saard.net
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26 |
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27 | # Europe
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28 | server ntp.tuxfamily.net
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29 |
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30 | # North America
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31 | server clock.psu.edu
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32 |
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33 | driftfile /var/cache/ntp.drift
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34 | <command>EOF</command></userinput></screen>
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35 | </sect3>
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36 |
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37 | <sect3><title>Synchronizing the time</title>
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38 |
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39 | <para>There are two options. Option one is to run <command>ntpd</command>
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40 | continuously and allow it to synchronize the time in a gradual manner. The other
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41 | option is to run <command>ntpd</command> periodically (using cron)
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42 | and update the time each time <command>ntpd</command> is scheduled.</para>
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43 |
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44 | <para>If you choose Option one, then install the
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45 | <filename>/etc/rc.d/init.d/ntp</filename>
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46 | init script included in the
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47 | <xref linkend="intro-important-bootscripts"/> package.</para>
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48 |
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49 | <screen><userinput><command>make install-ntp</command></userinput></screen>
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50 |
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51 | <para>If you prefer to run ntpd periodically, add the following command to
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52 | root's <filename>crontab</filename>:</para>
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53 | <screen><userinput>ntpd -q</userinput></screen>
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54 |
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55 | </sect3>
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56 |
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57 | </sect2>
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