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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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28
test/simulation/147-refresh
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@@ -25,7 +25,35 @@ check_file_messages "20.*192.168.123.2" 15 17 measurements.log || test_fail
check_file_messages "20.*192.168.123.[345]" 31 33 measurements.log || test_fail
rm -f tmp/measurements.log
if check_config_h 'FEAT_DEBUG 1'; then
check_log_messages "refreshing 192.168.123" 3 3 || test_fail
check_log_messages "resolved_name.*still fresh" 3 3 || test_fail
fi
limit=1100
client_server_conf="
server nodes-1-2.net1.clk maxpoll 6
pool nodes-3-4-5.net1.clk maxpoll 6 maxsources 3"
client_conf+="
refresh 128"
chronyc_conf=""
run_test || test_fail
check_chronyd_exit || test_fail
check_source_selection || test_fail
check_packet_interval || test_fail
check_sync || test_fail
check_file_messages "20.*192.168.123.1" 0 0 measurements.log || test_fail
check_file_messages "20.*192.168.123.2" 16 18 measurements.log || test_fail
check_file_messages "20.*192.168.123.[345]" 50 55 measurements.log || test_fail
rm -f tmp/measurements.log
if check_config_h 'FEAT_DEBUG 1'; then
check_log_messages "refreshing 192.168.123" 8 8 || test_fail
check_log_messages "resolved_name.*still fresh" 8 8 || test_fail
check_log_messages "refreshing 192.168.123.2" 2 2 || test_fail
check_log_messages "refreshing 192.168.123.3" 2 2 || test_fail
check_log_messages "refreshing 192.168.123.4" 2 2 || test_fail
check_log_messages "refreshing 192.168.123.5" 2 2 || test_fail
fi
test_pass