CentOS - Dec 2014 - HOWTO Stratum 1 NTP server under CentOS 7

Hello everyone,

If anyone is interested, I have created a HOWTO
on running a Motorola GPS receiver connected to
a CentOS 7 box via serial port (com1),
with 1PPS over DCD.

The trick here is that CentOS 7 uses systemd
and setup was a bit different. Anyway,
everything works.

The result is a highly accurate NTP server, Stratum 1.

Here is the documentation.

http://www.maximaphysics.com/Centos_7_GPS_Setup.html

Let me know if something does not look right.

-George, N2FGX

Am 11.12.2014 um 21:57 schrieb xaos:
> Hello everyone,
>
> If anyone is interested, I have created a HOWTO
> on running a Motorola GPS receiver connected to
> a CentOS 7 box via serial port (com1),
> with 1PPS over DCD.
>
> The trick here is that CentOS 7 uses systemd
> and setup was a bit different. Anyway,
> everything works.
>
> The result is a highly accurate NTP server, Stratum 1.
>
> Here is the documentation.
>
> http://www.maximaphysics.com/Centos_7_GPS_Setup.html
>
> Let me know if something does not look right.
>
> -George, N2FGX
Hello George,

thanks for the interesting article.

Mind you one question: why did you replace the NTPd shipping with CentOS 
7 by a source compilation? Is the NTPd version provided by CentOS 
lacking some important feature for that usecase?

Regards

Alexander

Alexander,

First off, CentOS7 came with cronyd. Which was very annoying
because when I tried to remove it, it had 2 prereqs:
anaconda
initial-setup

Now, I don't know why the setup program kept these
2 around. I think CentOS7 needs a bit growing up.

Anyway, I disabled chrony:
systemctl disable time-sync
systemctl stop time-sync

Then I installed ntp. However, when I started it
it seems that it was not compiled with: --enable-all-clocks

So, I downloaded the latest and re-compiled with:

./configure --with-crypto --enable-all-clocks --enable-step-slew

I built it as per the document and everything looks good

-G

On 12/12/2014 04:29 AM, Alexander Dalloz wrote:
> Am 11.12.2014 um 21:57 schrieb xaos:
>> Hello everyone,
>>
>> If anyone is interested, I have created a HOWTO
>> on running a Motorola GPS receiver connected to
>> a CentOS 7 box via serial port (com1),
>> with 1PPS over DCD.
>>
>> The trick here is that CentOS 7 uses systemd
>> and setup was a bit different. Anyway,
>> everything works.
>>
>> The result is a highly accurate NTP server, Stratum 1.
>>
>> Here is the documentation.
>>
>> http://www.maximaphysics.com/Centos_7_GPS_Setup.html
>>
>> Let me know if something does not look right.
>>
>> -George, N2FGX
>
> Hello George,
>
> thanks for the interesting article.
>
> Mind you one question: why did you replace the NTPd shipping with
> CentOS 7 by a source compilation? Is the NTPd version provided by
> CentOS lacking some important feature for that usecase?
>
> Regards
>
> Alexander
>
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos