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