| [chrony-users] RE: Poor synchronization to local NTP server |
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- To: "chrony-users@xxxxxxxxxxxxxxxxxxxx" <chrony-users@xxxxxxxxxxxxxxxxxxxx>
- Subject: [chrony-users] RE: Poor synchronization to local NTP server
- From: Frank Wayne <fwayne@xxxxxxxxxxxxxx>
- Date: Tue, 16 Mar 2021 19:40:18 +0000 (UTC)
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- Thread-topic: Poor synchronization to local NTP server
Way, way too little information.
First of all, there doesn't seem to be anything wrong from the data you sent. NIST servers are notoriously bad time sources compared to most pool sources in my experience.
Second, you are showing data from about three minutes of chrony activity. It may be too soon to say.
Third, try adding two or three other pool servers. You can't tell if asdfasdfa is off or something like asymmetry is causing the pool server to seem off.
Fourth, what does ntpq tell you on the ntpd server? How accurate does it think it is?
________________________________________
From: Ryan Govostes [rgovostes@xxxxxxxx]
Sent: Tuesday, March 16, 2021 14:10
To: chrony-users@xxxxxxxxxxxxxxxxxxxx
Subject: [chrony-users] Poor synchronization to local NTP server
I am running ntpd on a local server. That server syncs its clock to pool.ntp.org.
Now I want another device, running chrony, to sync its clock to the local server, so I configured chrony with `server asdfasdfa iburst`. For comparison I also added `server time.nist.gov iburst`.
I’m not sure I’m interpreting the output of chronyc correctly but it seems that it is getting a much better fix to the remote NIST server than to the local server which is on the same subnet and responds to ping in < 0.5 ms.
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^- asdfasdfa 4 6 7 2 +39ms[ -669us] +/- 109ms
^* time-d-b.nist.gov 1 6 7 2 -16us[ -40ms] +/- 27ms
Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
==============================================================================
asdfasdfa 8 4 265 -1.772 4.203 +39ms 191us
time-d-b.nist.gov 8 6 265 -2.494 9.770 -61us 442us
What could I start looking into to diagnose the issue? Is it likely to be chrony or the ntp server at fault?
Thanks,
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