Zitat von Martin Burnicki <[email protected]>:
Kiss Gábor wrote:
Hi guys,
I just remind you there will be a leap second at the end of June.
All of us should prepare of ntp pool servers as described here:
http://lists.ntp.org/pipermail/questions/2008-August/019336.html
While it's generally a good idea to use a leap second file, the
hints in the 2nd part of the referred email should be more
appropriate for current installations running ntpd 4.2.6 or 4.2.8,
i.e., use the "leapfile" keyword in ntp.conf.
Please note that if you run 4.2.6 with an outdated leap second file
your NTP server will *not* accept any leap second warning from
upstream servers or a refclock.
This is *not* a bug but the intended behavior. See NTP bug 861,
comment 46 and 47, as well as the following discussion:
http://bugs.ntp.org/show_bug.cgi?id=861#c46
So if you are running ntpd 4.2.6 with a leap second file configured
then please make sure to use the current version of the leap second
file. Otherwise you *will* encounter a problem when the leap second
occurs.
BTW, in 4.2.8 this has fortunately been reworked, so an expired leap
second file is ignored as it ought to be, and leap second
announcements from other sources are accepted if the leap second
file has expired.
Martin
--
Martin Burnicki
Senior Software Engineer
MEINBERG Funkuhren GmbH & Co. KG
Email: [email protected]
Phone: +49 (0)5281 9309-14
Fax: +49 (0)5281 9309-30
Sorry for maybe asking the obvious but
- How to check if ntp is configured with a leap second file? Must it
be listed in ntp.conf or is there some default set?
- Without a leap second file ntp will simply decide based on the
majority of upstream ntp servers it it will pass the information or
will it pass the information from the "*" upstream?
- What is the expected timeframe of leap second file changes
(Month/Years/Decade)??
What happens if the upstream get it wrong and omit the leap second?
Are we wrong by one second or do we simply switch later and slower?
Thanks for explainig it to mortals ;-)
Andreas
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