[CentOS] NTP Service Running on Local Host does not Sync System Time

On 2016-01-27 09:36, John R Pierce wrote:

Hi!

> ntpd won't make drastic changes in the time, if its too far off. its
> designed to stabilize the clock by making small changes in speeding it
> up or slowing it down, and not 'staircase' setting it absolutely.

http://www.ntp.org/ntpfaq/NTP-s-algo.htm#Q-ALGO-BASIC-STEP-SLEW

Apart from that, the ntp-implementation (or chrony nowadays) "wants" to 
have more than one time source.

http://www.ntp.org/ntpfaq/NTP-s-algo-real.htm#Q-NTP-ALGO

Cheers

Dirk

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