Groups > linux.debian.user > #182082

Re: NTP.conf pool vs server

From	Brian <ad44@cityscape.co.uk>
Newsgroups	linux.debian.user
Subject	Re: NTP.conf pool vs server
Date	2017-06-11 19:30 +0200
Message-ID	<tReQy-7P0-3@gated-at.bofh.it> (permalink)
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On Sun 11 Jun 2017 at 10:57:51 -0500, David Wright wrote:

> On Wed 07 Jun 2017 at 17:26:30 (+0100), Brian wrote:
> > On Wed 07 Jun 2017 at 10:30:54 -0500, John Hasler wrote:
> > 
> > > Remove Ntp and install Chrony.
> > 
> > Too easy. There would be nothing to rant about. :)
> > 
> > https://chrony.tuxfamily.org/comparison.html
> 
> I read this and did exactly that:

It's good to see someone testing things.

> Start-Date: 2017-06-07  12:58:22
> Install: […], chrony:i386 (1.30-2+deb8u2), […]
> 
> I looked at, but didn't change, the configuration file.

Three machines running chrony here. One (which is always on) has an
original chrony.conf and the only change to the other one (a laptop
which is suspended overnight) is to use my ISP's time servers. The
third one has just been booted after not being used for fourteen
days; it uses a single one of my ISP's time servers.

> Two days later, the laptop¹ was still running about five seconds
> slow, so:
> 
> Start-Date: 2017-06-09  17:39:56
> Purge: […], chrony:i386 (1.30-2+deb8u2), […]
> 
> Start-Date: 2017-06-09  17:43:19
> Install: […], ntp:i386 (4.2.6.p5+dfsg-7+deb8u2)
> 
> I looked at, but didn't change, the configuration file.
> 
> By the time I had brought up two swissclocks (from my server
> and other laptop) all three second hands were marching in step
> (and within one second of the radio wall clock).
> 
> ¹ had been "running free".

Machines number 1 and 2 are in step with my radio clock. Machine
number 3 came up three seconds slow. Within 6 minutes it agreed
with the other machines. I cannot account for this because I've
never had cause to examine chrony's configuration or internal
workings. Perhaps it has to do with frequency of polling? At the
moment my motivation to find out why is not high.

All my other machines use systemd-timesyncd on the basis it is
already available on them. The first three have used chrony for
nearly ten years without a discernable problem.

-- 
Brian.

Thread

NTP.conf   pool vs server ray <ray@aarden.us> - 2017-06-07 15:20 +0200
  Re: NTP.conf   pool vs server Greg Wooledge <wooledg@eeg.ccf.org> - 2017-06-07 15:30 +0200
    Re: NTP.conf   pool vs server Gene Heskett <gheskett@shentel.net> - 2017-06-07 16:50 +0200
  Re: NTP.conf   pool vs server Gene Heskett <gheskett@shentel.net> - 2017-06-07 16:40 +0200
    Re: NTP.conf   pool vs server Greg Wooledge <wooledg@eeg.ccf.org> - 2017-06-07 17:00 +0200
    Re: NTP.conf   pool vs server Darac Marjal <mailinglist@darac.org.uk> - 2017-06-07 17:00 +0200
      Re: NTP.conf   pool vs server Greg Wooledge <wooledg@eeg.ccf.org> - 2017-06-07 17:10 +0200
        Re: NTP.conf pool vs server Joshua Schaeffer <jschaeffer0922@gmail.com> - 2017-06-07 17:30 +0200
          Re: NTP.conf pool vs server Greg Wooledge <wooledg@eeg.ccf.org> - 2017-06-07 17:50 +0200
        Re: NTP.conf   pool vs server Henrique de Moraes Holschuh <hmh@debian.org> - 2017-06-07 18:10 +0200
      Re: NTP.conf   pool vs server Darac Marjal <mailinglist@darac.org.uk> - 2017-06-07 17:20 +0200
      Re: NTP.conf   pool vs server Gene Heskett <gheskett@shentel.net> - 2017-06-08 01:10 +0200
        Re: NTP.conf   pool vs server Darac Marjal <mailinglist@darac.org.uk> - 2017-06-08 14:30 +0200
          Re: https_port "Adiel Plasencia Herrera" <adielp@estereocentro.icrt.cu> - 2017-06-08 14:50 +0200
            Re: https_port Darac Marjal <mailinglist@darac.org.uk> - 2017-06-08 15:30 +0200
              Re: https_port Henrique de Moraes Holschuh <hmh@debian.org> - 2017-06-08 17:00 +0200
                Re: https_port "Adiel Plasencia Herrera" <adielp@estereocentro.icrt.cu> - 2017-06-08 17:20 +0200
                Re: https_port Darac Marjal <mailinglist@darac.org.uk> - 2017-06-08 17:30 +0200
                Re: https_port Greg Wooledge <wooledg@eeg.ccf.org> - 2017-06-08 17:40 +0200
                Re: https_port Darac Marjal <mailinglist@darac.org.uk> - 2017-06-08 17:50 +0200
                Re: https_port "Adiel Plasencia Herrera" <adielp@estereocentro.icrt.cu> - 2017-06-08 18:00 +0200
                Re: https_port Jim Ohlstein <jim@mailman-hosting.com> - 2017-06-08 19:10 +0200
                Re: https_port Charlie Kravetz <cjk@teamcharliesangels.com> - 2017-06-09 16:40 +0200
                Reply-to-all or reply-to-list again (was: https_port) Nicolas George <george@nsup.org> - 2017-06-09 16:50 +0200
                Re: Reply-to-all or reply-to-list again (was: https_port) Fungi4All <fungilife@protonmail.com> - 2017-06-09 17:20 +0200
                Re: Reply-to-all or reply-to-list again The Wanderer <wanderer@fastmail.fm> - 2017-06-09 17:20 +0200
                Re: Reply-to-all or reply-to-list again Nicolas George <george@nsup.org> - 2017-06-09 18:00 +0200
                Re: Reply-to-all or reply-to-list again The Wanderer <wanderer@fastmail.fm> - 2017-06-09 21:20 +0200
                Re: Reply-to-all or reply-to-list again Joel Rees <joel.rees@gmail.com> - 2017-06-10 04:20 +0200
                Re: Reply-to-all or reply-to-list again Fungi4All <fungilife@protonmail.com> - 2017-06-10 16:00 +0200
                Re: Reply-to-all or reply-to-list again Joel Rees <joel.rees@gmail.com> - 2017-06-10 16:30 +0200
                Re: Reply-to-all or reply-to-list again Fungi4All <fungilife@protonmail.com> - 2017-06-10 18:00 +0200
                Re: Reply-to-all or reply-to-list again (was: https_port) Gene Heskett <gheskett@shentel.net> - 2017-06-09 17:30 +0200
          Re: NTP.conf   pool vs server Gene Heskett <gheskett@shentel.net> - 2017-06-08 16:10 +0200
    Re: NTP.conf   pool vs server John Hasler <jhasler@newsguy.com> - 2017-06-07 18:10 +0200
      Re: NTP.conf   pool vs server Brian <ad44@cityscape.co.uk> - 2017-06-07 18:30 +0200
        Re: NTP.conf   pool vs server David Wright <deblis@lionunicorn.co.uk> - 2017-06-11 18:00 +0200
          Re: NTP.conf   pool vs server Brian <ad44@cityscape.co.uk> - 2017-06-11 19:30 +0200
      Re: NTP.conf   pool vs server Teemu Likonen <tlikonen@iki.fi> - 2017-06-08 08:40 +0200
        Re: NTP.conf   pool vs server Curt <curty@free.fr> - 2017-06-08 09:20 +0200
        Re: NTP.conf   pool vs server Gene Heskett <gheskett@shentel.net> - 2017-06-08 15:40 +0200
    Re: NTP.conf   pool vs server Jim Ohlstein <jim@mailman-hosting.com> - 2017-06-07 18:40 +0200
  Re: NTP.conf   pool vs server Kushal Kumaran <kushal@locationd.net> - 2017-06-07 17:00 +0200

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