| Re: [chrony-users] rejecting one of two trusted hosts |
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The problem is how do you know which server is serving "good time". The only
notion of time that chrony has is that which is delivered to it by the
servers. There is no other source of time. You order chrony to trust that
those two clocks give good time. But they may disagree, so you do not trust
them. They might be wrong.
As Miroslav said, chrony uses distance as a criterion for deciding which
server to use. So the fact that time-alt1 is far away is used to downrate it.
even if all three are trusted.
William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/
On Mon, 14 Feb 2022, Aaron Ball wrote:
[CAUTION: Non-UBC Email]
If you are willing to accept a majority with time-alt1, why is it not
trusted?
Well, I'm asking because I'm not clear on how best to express what we want to do.
Should we be using "prefer" instead of "trust"? The alternate time servers are fine
servers, but far enough away that they won't be setting time precisely enough.
The idea is that, if either tick or tock is serving good time, we want to get our time
from them and not consider the alt servers. If they are both up but disagree on the
time, historically it's been due to a relatively big difference (e.g., a 1s blip from
an upstream PTP source) that put one of them clearly outside the consensus of the alt
servers, so chrony's past behavior worked well for us.
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