Re: [chrony-users] Validating PHC operation on Microsoft VM

I synchronized the host using chrony and nearby stratum 1's and then compared the PHC time to the host time.

The results are bizarre. I have only oneVM, so this result might not hold elsewhere.

Miroslav suggests this might be a hyper-v issue.

Hope this image gets through the mailing list. If not, I'll post it elsewhere.

On Wed, Feb 26, 2025 at 2:22 AM Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:

On Wed, Feb 26, 2025 at 12:59:20PM +0800, Mingye Wang wrote:
> I can see why Microsoft Azure picked that option: they don't want to
> overload the NTP pool (like I've complained about recently)[1], but
> their approach is a bit off. Specifically, I believe they should have
> specified a nonzero stratum so that chrony does not place too much
> trust in the host time. Is there anyone from Azure that I can contact
> on this issue?

If there is only one source, it doesn't matter what stratum it has.
Its weight can change only relative to other sources.

If you want to propose changes to the default configuration, you will
need to find out where it is coming from. There could be a base image
provided by the OS vendor and other changes layered on top maintained
elsewhere. Not easy to follow. I think most of the Azure stuff is on
github.

--
Miroslav Lichvar

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