NTP
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(Difference between revisions)
(Added NTP installation) |
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<pre>ntpdate -q</pre><pre>chkconfig --list | grep ntpd</pre> | <pre>ntpdate -q</pre><pre>chkconfig --list | grep ntpd</pre> | ||
If all the columns are 'off', then it's not enabled. | If all the columns are 'off', then it's not enabled. | ||
| − | |||
| − | |||
You can use the following command to enable NTP:<br> | You can use the following command to enable NTP:<br> | ||
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<pre>service ntpd start | <pre>service ntpd start | ||
</pre> | </pre> | ||
| − | |||
| − | <br> | + | You can check if the time is in sync using:<br> |
| + | <pre>ntpq -p</pre> | ||
| + | It will display a list of servers and the server which is currently synced should be prepended by a '*'. For example: | ||
| + | <pre> | ||
| + | remote refid st t when poll reach delay offset jitter | ||
| + | ============================================================================== | ||
| + | *barricade.rack9 209.51.161.238 2 u 1001 1024 377 31.147 -0.369 20.074 | ||
| + | +ip-72-167-42-82 204.123.2.5 2 u 754 1024 377 166.388 -29.692 28.223 | ||
| + | +cheezum.mattnor 129.7.1.66 2 u 91 1024 377 45.715 1.504 47.753 | ||
| + | </pre> | ||
| + | In this case the host's time is synced with arricade.rack9. | ||
Revision as of 17:29, 1 December 2010
You can use the following command to check if it's enabled:
ntpdate -q
chkconfig --list | grep ntpd
If all the columns are 'off', then it's not enabled.
You can use the following command to enable NTP:
yum install ntpd chkconfig ntpd on
Then use the following command to start it:
service ntpd start
You can check if the time is in sync using:
ntpq -p
It will display a list of servers and the server which is currently synced should be prepended by a '*'. For example:
remote refid st t when poll reach delay offset jitter
==============================================================================
*barricade.rack9 209.51.161.238 2 u 1001 1024 377 31.147 -0.369 20.074
+ip-72-167-42-82 204.123.2.5 2 u 754 1024 377 166.388 -29.692 28.223
+cheezum.mattnor 129.7.1.66 2 u 91 1024 377 45.715 1.504 47.753
In this case the host's time is synced with arricade.rack9.
