[Pool] Off by a second leap second failures

David Lord david at lordynet.org
Sat Jul 11 12:37:35 UTC 2015


On 11 Jul 2015 at 9:15, John Winters wrote:

> On 11/07/15 08:48, Hal Murray wrote:
> > 
> > ntp at sinodun.org.uk said:
> >> I have to confess that my server was one of those which failed to handle the
> >> leap second gracefully, and I've yet to work out why. 
> > 
> > What OS/distro?  What version?  Was everything up to date?
> 
> Debian 8.1 (armhf).  Yes.
> 
> > What version of ntpd?
> 
> As distributed with the OS - appears to be 4.2.6
> 
> > Where was it getting its time from?
> 
> ntp2c.mcc.ac.uk
> ntp0.luns.net.uk
> ntp.cis.strath.ac.uk
> 
> 
> > How did they behave?
> 
> Afraid I don't know.
> 
> I'm sure it's something which I did wrong, but I just need to spend a
> bit of thinking time on it.
> 


Hi John

> As distributed with the OS - appears to be 4.2.6
4.2.6 isn't detailed enough

what does ntpq or ntpdc return

$ ntpq -c version
ntpq 4.3.9 at 1.2483-o Tue Mar 17 16:13:05 UTC 2015 (1)


Here I have a local GPS/PPS source if that matters.

I use some of the same ntp sources as you.
dir.mcc.ac.uk
ntserv.mcc.ac.uk
turnip.mc.man.ac.uk
ntp0.cis.strath.ac.uk
ns1.luns.net.uk


As you can see from these stats taken from my four pool servers, 
none of the above were out by a second, in fact none of my other
ntp sources was out by more than a few ms.

Prior to Jul 1 all my ntp servers were showing leap_armed and all
had the then current leapfile.


# ntp3.lordynet.org, Wed Jul  1 00:13:00 GMT 2015:
associd=0 status=061b leap_none, sync_ntp, 1 event, leap_event,
ntpd 4.2.8p1-beta1
        remote           refid  st t poll reach offset jitter
+turnip.mc.man.a 195.66.241.10   2 u  256   377  0.368  0.390
+ns1.luns.net.uk 158.43.192.66   2 u  256   377  0.258  0.379


# ntp2.lordynet.org.uk, Wed Jul  1 00:04:00 GMT 2015:
associd=0 status=061b leap_none, sync_ntp, 1 event, leap_event,
ntpd 4.3.9
        remote           refid  st t poll reach offset jitter
*me6000e.home.lo .PPSb.          1 u   64   377  0.219  0.554


# mail.lordynet.org, Wed Jul  1 00:13:00 GMT 2015:
associd=0 status=061b leap_none, sync_ntp, 1 event, leap_event,
ntpd 4.2.8p1-beta1
        remote           refid  st t poll reach offset jitter
+dir.mcc.ac.uk   193.62.22.98    2 u  256   377  2.094  0.126


# mail0.lordynet.org.uk, Wed Jul  1 00:13:00 GMT 2015:
associd=0 status=061b leap_none, sync_ntp, 1 event, leap_event,
ntpd 4.2.8p1-beta1
        remote           refid  st t poll reach offset jitter
+ntserv.mcc.ac.u 130.88.212.143  3 u  256   377  3.103  0.930
+ntp0.cis.strath 193.62.22.90    2 u  256   377  0.177  0.322


Pcs are running NetBSD-6 i386


David

-- 
David Lord <david at lordynet.org>
<ftp://ftp.lordynet.org/pub/pgpkeys/david@lordynet.org>
<http://www.lordynet.org/pub/pgpkeys/david@lordynet.org>





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