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ntp: refresh IP addresses periodically

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Refresh NTP sources specified by hostname periodically (every 2 weeks
by default) to avoid long-running instances using a server which is no
longer intended for service, even if it is still responding correctly
and would not be replaced as unreachable, and help redistributing load
in large pools like pool.ntp.org. Only one source is refreshed at a time
to not interrupt clock updates if there are multiple selectable servers.

The refresh directive configures the interval. A value of 0 disables
the periodic refreshment.

Suggested-by: Ask Bjørn Hansen <ask@develooper.com>
This commit is contained in:
Miroslav Lichvar
2023-06-20 16:23:34 +02:00
parent 36f9b24dfe
commit b86c50bb9f
5 changed files with 103 additions and 1 deletions
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13
doc/chrony.conf.adoc
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@@ -884,6 +884,19 @@ This would disable the time checks until the clock is updated for the first
time, assuming the first update corrects the clock and later checks can work
with correct time.
[[refresh]]*refresh* _interval_::
This directive specifies the interval (in seconds) between refreshing IP
addresses of NTP sources specified by hostname. If the hostname no longer
resolves to the currently used address, it will be replaced with one of the new
addresses to avoid using a server which is no longer intended for service, even
if it is still responding correctly and would not be replaced as unreachable.
Only one source is refreshed at a time. The default value is 1209600 (2 weeks)
and the maximum value is 2^31-1 (68 years). A value of 0 disables the periodic
refreshment.
+
The <<chronyc.adoc#refresh,*refresh*>> command can be used to refresh all
sources immediately.
=== Source selection
[[authselectmode]]*authselectmode* _mode_::