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@centos.org http://lists.centos.org/mailman/listinfo/centos

On Fri, Dec 12, 2014 at 9:12 AM, Nux! nux@li.nux.ro wrote:

The right thing to do next is to ask for this change upstream, so people can get regular updates and stay secure.

Lucian

-- Sent from the Delta quadrant using Borg technology!

Nux! www.nux.ro

+1 agree 100%

Jonathan,

I would much prefer to run out-of-the box. No question!

BTW, on other machines that I installed CentOS7, chrony, was not there. Neither was anaconda or initial-setup. This was after the install, naturally.

Ok, so maybe this box was unlucky. It was installed the same day as Centos7 came out. I will re-install, update and see what happens.

Quite often the problem lies between the computer and the chair.

Update to follow...

-George

On 12/12/2014 11:55 AM, Jonathan Billings wrote:

On Fri, Dec 12, 2014 at 09:55:12AM -0500, xaos wrote:

...

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.

'initial-setup' is the program that runs on your first boot, and it requires 'anaconda'. 'anaconda' requires the 'chrony' package. Services in the default install require a time-sync daemon, and chrony is the default, so this isn't really unexpected. Once a system is set up, it doesn't remove the initial-setup package.

...

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

That doesn't seem to be the case. Looking at the NTP spec file, I see:

%configure \ --sysconfdir=%{_sysconfdir}/ntp/crypto \ --with-openssl-libdir=%{_libdir} \ --without-ntpsnmpd \ --enable-all-clocks --enable-parse-clocks \ --enable-ntp-signd=%{_localstatedir}/run/ntp_signd \ --disable-local-libopts

(check the git.centos.org version yourself: https://git.centos.org/blob/rpms!ntp.git/dbacec4466ee70248db634b110bfad8a2b7... )

As far as I can tell, there is literally no reason why you can't use the packaged ntpd.

If you are having a problem with getting the packaged ntpd working, I suggest filing a bug against the RHEL package. The package has many patches, perhaps one of them is interfering with detecting your device.

On Fri, Dec 12, 2014 at 09:50:16PM +0100, Sven Kieske wrote:

Then it should just require a time-sync daemon, and not a specific one imho.

Perhaps both the 'chrony' and 'ntp' packages should Provide 'server(smtp)' (similar to how sendmail/postfix work with SMTP)? That way anaconda could just require 'server(ntp)'.

Either way, this isn't something that would need to be solved in the upstream distribution.