nanog mailing list archives

Re: Erroneous Leap Second Introduced at 2014-06-30 23:59:59 UTC


From: Daniël W. Crompton <daniel.crompton () gmail com>
Date: Tue, 1 Jul 2014 12:52:11 +0200

That's strange as I remember reading this yesterday: NO leap second will be
introduced at the end of June 2014.

http://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat

D.


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On 1 July 2014 04:27, Majdi S. Abbas <msa () latt net> wrote:

On Mon, Jun 30, 2014 at 05:33:52PM -0700, Tim Heckman wrote:
I just was alerted to one of the systems I managed having a time skew
greater than 100ms from NTP sources. Upon further investigation it
seemed that the time was off by almost exactly 1 second.

Looking back over our NTP monitoring, it would appear that this system
had a large time adjust at approximately 00:00 UTC:

        Okay.  Do you have any logging configured (peerstats, etc?) for
ntpd?

A few of our systems did alert early this morning, indicating they
were going to be receiving a leap second today. However, I was unable
to determine the exact cause for NTP believing a leap second should be
added. And after some time a few of the systems were no longer
indicating that a leap second would be introduced.

        This can happen if a server is either passing along a leap
notification that it received, or is configured to use a leapseconds
file that is incorrect.

This specific system is hosted in AWS US-WEST-2C and uses the
0.amazon.pool.ntp.org pool.

        0 is just one server in the pool (whichever you draw by
rotation); is this the only server you have configured?

        --msa



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