Friday, October 05, 2012

Setup ntpd

To synchronize your unix to the HK time servers:

1.    service stop ntpd
2.    ntpdate  // we set a sensible time first
3.    vi /etc/ntp.conf and put the followings.


driftfile /var/lib/ntp/drift

4.    service start ntpd

Soon, you will see the ntp status.  For illustration:
#ntpq -pn
     remote           refid      st t when poll reach   delay   offset  jitter
*   2 u   60   64   17    7.094    7.683   3.114
+     3 u   61   64   17   10.296    6.702   4.906     .LOCL.          10 l    -   64   37    0.000    0.000   0.008

The actual ip addresses will be different as you are assigned random servers from the pool.  The important thing is the '*' sign in front of one of them, meaning that your server is now getting time from internet.

If you are unable to synchronize with the time servers, please check that UDP port 123 is opened.


  1. Service ntpd start, not service start nptd


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