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ntp: avoid unneccessary replacements on refresh command

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When the refresh command is issued, instead of trying to replace all
NTP sources as if they were unreachable or falsetickers, keep using the
current address if it is still returned by the resolver for the name.
This avoids unnecessary loss of measurements and switching to
potentially unreachable addresses.
This commit is contained in:
Miroslav Lichvar
2023-05-15 16:26:21 +02:00
parent 6a6161dc0f
commit b2dac47c82
3 changed files with 62 additions and 8 deletions
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15
doc/chronyc.adoc
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@@ -970,12 +970,17 @@ current set of sources. It is equivalent to the *polltarget* option in the
[[refresh]]*refresh*::
The *refresh* command can be used to force *chronyd* to resolve the names of
configured sources to IP addresses again, e.g. after suspending and resuming
the machine in a different network.
configured NTP sources to IP addresses again and replace any addresses missing
in the list of resolved addresses.
+
Sources that stop responding will be replaced with newly resolved addresses
automatically after 8 polling intervals, but this command can still be useful
to replace them immediately and not wait until they are marked as unreachable.
Sources that stop responding are replaced with newly resolved addresses
automatically after 8 polling intervals. This command can be used to replace
them immediately, e.g. after suspending and resuming the machine in a different
network.
+
Note that with larger pools which do not have all their IPv4 or IPv6 addresses
included in a single DNS response (e.g. pool.ntp.org), this command will
replace the addresses even if they are still included in the pool.
[[reload]]*reload* *sources*::
The *reload sources* command causes *chronyd* to re-read all _*.sources_ files