Thanks for reply

 in this page is another ntp server but no information said this list ntp server is used for the Varnish server

https://gerrit.wikimedia.org/r/c/operations/puppet/+/409057/2/modules/profile/manifests/ntp.pp#47

You gave me information is used public ntp server pool.ntp.org but  no said is used Varnish server

I think wikiteah need have explain in detail, I believe it will reduce the workload of your enquiries and responses what are is about all server is used  where ntp server for your server

在 2021年3月16日週二 21:57，Andrew Otto <otto@wikimedia.org> 寫道：
Am not totally sure how our NTP setup works, but it is all in the WMF's puppet repository.  https://github.com/wikimedia/puppet/blob/production/modules/profile/manifests/ntp.pp looks like a good place to start. 

On Tue, Mar 16, 2021 at 6:04 AM Ho Chung <chungho4865@gmail.com> wrote:
Hello

Have anyone know the Varnish ntp server clock accuracy  can it be used as a forensic clock after evaluation?

Do you use some third-party unapproved NTP clocks for your time?

Thanks 👍
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