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sources: add configurable limits for stratum

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Add minstratum and maxstratum directives to specify the minimum and
maximum allowed stratum of sources to be selected. The default values
are 0 and 15 respectively, allowing all NTP sources and refclocks.

Sources that are rejected due to having too large or too small stratum
are marked with 'r' in the selection log and selectdata report.

This is similar to the "tos floor" and "tos ceiling" settings of ntpd,
except that maxstratum is interpreted as one below the ceiling.
This commit is contained in:
Miroslav Lichvar
2025-11-04 11:39:40 +01:00
parent c252e52ee2
commit 2da8fbc4c3
7 changed files with 108 additions and 5 deletions
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doc/chronyc.adoc
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@@ -474,6 +474,9 @@ synchronisation:
* _N_ - has the *noselect* option.
* _M_ - does not have enough measurements.
* _s_ - is not synchronised.
* _r_ - has a stratum outside of the allowed range (configured by the
<<chrony.conf.adoc#minstratum,*minstratum*>> and
<<chrony.conf.adoc#maxstratum,*maxstratum*>> directives).
* _d_ - has a root distance larger than the maximum distance (configured by the
<<chrony.conf.adoc#maxdistance,*maxdistance*>> directive).
* _~_ - has a jitter larger than the maximum jitter (configured by the