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

[James Hogarth]

On 27 January 2016 at 08:53, Dirk Deimeke <dirk at deimeke.net> wrote:
> 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
>
>

It's best practice to have a reasonable pool of sources (3, 5 or 7
depending on how many false tickers you want to be able to cope with)
but it can run against a single source, with the understanding that it
has to trust it as real time since there's nothing to compare it to.