Difference between revisions of "Network Time Protocol"

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== Syncing your clock to Virginia Tech's time servers ==
 
== Syncing your clock to Virginia Tech's time servers ==
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Virginia Tech hosts four [http://en.wikipedia.org/wiki/Network_Time_Protocol  Network Time Protocol] (NTP) servers:
+
Virginia Tech hosts four [[w:Network Time Protocol|Network Time Protocol]] (NTP) servers:
 +
 
 +
* '''ntp-1.vt.edu''' (198.82.247.51) (2001:468:c80:2101:0:14b:a768:154f)
 +
* '''ntp-2.vt.edu''' (198.82.247.71) (2001:468:c80:4101:0:1b6:a45f:ab40)
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* '''ntp-3.vt.edu''' (198.82.247.108) (2001:468:c80:6101:0:111:7c3a:677)
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* '''ntp-4.vt.edu''' (198.82.247.131) (2001:468:c80:8101:0:178:d2dd:db75)
 +
 
 +
=== Using Gnome ===
 +
# Right click on the clock in the top right hand corner of your desktop and select '''Adjust Date & Time'''.
 +
# You may have to enter your password to continue.
 +
# From the '''Configuration''' drop-down list, select '''Keep synchronized with Internet servers'''.
 +
# You may need to click '''Install NTP support'''.
 +
# Click '''Select Servers'''.
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# Type <code>ntp-1.vt.edu</code>
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# Click the '''Add''' button.
 +
# Type <code>ntp-2.vt.edu</code>
 +
# Click the '''Add''' button.
 +
# Type <code>ntp-3.vt.edu</code>
 +
# Click the '''Add''' button.
 +
# Type <code>ntp-4.vt.edu</code>
 +
# Click the '''Add''' button.
 +
# Click the '''Close''' button.
 +
# Click the '''Close''' button again.
  
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<ul><li> '''ntp-1.vt.edu''' (198.82.1.201)
 
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</li><li> '''ntp-2.vt.edu''' (198.82.1.202)
 
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</li><li> '''ntp-3.vt.edu''' (198.82.1.203)
 
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</li><li> '''ntp-4.vt.edu''' (198.82.1.204)
 
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</li></ul>
 
−
=== Using GNOME ===
 
−
<ol><li> Right click on the clock in the top right hand corner of your desktop and select '''Adjust Date &amp; Time'''.
 
−
</li><li> You may have to enter your password to continue.
 
−
</li><li> From the '''Configuration''' drop-down list, select '''Keep synchronized with Internet servers'''.
 
−
</li><li> You may need to click '''Install NTP support'''.
 
−
</li><li> Click '''Select Servers'''.
 
−
</li><li> Type <code>ntp-1.vt.edu</code>
 
−
</li><li> Click the '''Add''' button.
 
−
</li><li> Type <code>ntp-2.vt.edu</code>
 
−
</li><li> Click the '''Add''' button.
 
−
</li><li> Type <code>ntp-3.vt.edu</code>
 
−
</li><li> Click the '''Add''' button.
 
−
</li><li> Type <code>ntp-4.vt.edu</code>
 
−
</li><li> Click the '''Add''' button.
 
−
</li><li> Click the '''Close''' button.
 
−
</li><li> Click the '''Close''' button again.
 
−
</li></ol>
 
 
=== Using ntpd ===
 
=== Using ntpd ===
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<ol><li> Backup your ntp.conf <code></code><pre>cp /etc/ntp.conf /etc/ntp.conf.bak</pre>
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Backup your <code>/etc/ntp.conf</code>:
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</li><li> Add the following lines to <code>/etc/ntp.conf</code>:  
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<pre>
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</li></ol>
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# cp /etc/ntp.conf /etc/ntp.conf.bak
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<code></code><pre>server ntp-1.vt.edu
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</pre>
 +
 
 +
Add the following lines to <code>/etc/ntp.conf</code>:  
 +
<pre>
 +
server ntp-1.vt.edu
 
server ntp-2.vt.edu
 
server ntp-2.vt.edu
 
server ntp-3.vt.edu
 
server ntp-3.vt.edu
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server ntp-4.vt.edu</pre>
+
server ntp-4.vt.edu
 +
</pre>
 +
 
 
=== Using ntpdate ===
 
=== Using ntpdate ===
−
<ol><li> Change the contents of /etc/cron.daily/ntpdate to: <code></code><pre>ntpdate ntp-1.vt.edu ntp-2.vt.edu ntp-3.vt.edu ntp-4.vt.edu</pre>
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Change the contents of <code>/etc/cron.daily/ntpdate</code> to:
−
</li></ol>
+
<pre>
 +
ntpdate ntp-1.vt.edu ntp-2.vt.edu ntp-3.vt.edu ntp-4.vt.edu
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</pre>
 +
 
  
 
[[Category:Howtos]]
 
[[Category:Howtos]]
 
[[Category:Campus computing resources]]
 
[[Category:Campus computing resources]]

Latest revision as of 16:32, 7 February 2018

Syncing your clock to Virginia Tech's time servers

Virginia Tech hosts four Network Time Protocol (NTP) servers:

  • ntp-1.vt.edu (198.82.247.51) (2001:468:c80:2101:0:14b:a768:154f)
  • ntp-2.vt.edu (198.82.247.71) (2001:468:c80:4101:0:1b6:a45f:ab40)
  • ntp-3.vt.edu (198.82.247.108) (2001:468:c80:6101:0:111:7c3a:677)
  • ntp-4.vt.edu (198.82.247.131) (2001:468:c80:8101:0:178:d2dd:db75)

Using Gnome

  1. Right click on the clock in the top right hand corner of your desktop and select Adjust Date & Time.
  2. You may have to enter your password to continue.
  3. From the Configuration drop-down list, select Keep synchronized with Internet servers.
  4. You may need to click Install NTP support.
  5. Click Select Servers.
  6. Type ntp-1.vt.edu
  7. Click the Add button.
  8. Type ntp-2.vt.edu
  9. Click the Add button.
  10. Type ntp-3.vt.edu
  11. Click the Add button.
  12. Type ntp-4.vt.edu
  13. Click the Add button.
  14. Click the Close button.
  15. Click the Close button again.

Using ntpd

Backup your /etc/ntp.conf: 

# cp /etc/ntp.conf /etc/ntp.conf.bak

Add the following lines to /etc/ntp.conf: 

server ntp-1.vt.edu
server ntp-2.vt.edu
server ntp-3.vt.edu
server ntp-4.vt.edu

Using ntpdate

Change the contents of /etc/cron.daily/ntpdate to: 

ntpdate ntp-1.vt.edu ntp-2.vt.edu ntp-3.vt.edu ntp-4.vt.edu
Retrieved from "https://vtluug.org/w/index.php?title=Network_Time_Protocol&oldid=683"