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Document the new unreachable cache behavior

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Update the documentaion to include information about how the cache's
exponential backoff works, and how to clear the cache.
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Aram Sargsyan
2025-04-15 14:57:52 +00:00
parent 14915b0241
commit 0f2fba46ad
1 changed files with 7 additions and 0 deletions
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doc/arm/config-auth.inc.rst
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@@ -87,6 +87,13 @@ The numbers in parentheses in the following text refer to the numbered items in
from the primary (as described in section 2 a. above). If the zone file has from the primary (as described in section 2 a. above). If the zone file has
changed, propagation is practically immediate. changed, propagation is practically immediate.
.. Note:: When a primary server is unreachable, :iscman:`named` initially caches
that information for 10 seconds. After that initial period, :iscman:`named`
may try that server again; if the server remains unresponsive,
:iscman:`named` caches its unreachable status for up to 640 seconds using an
exponential backoff. During that time :iscman:`named` does not try to contact
the affected server. The cache can be cleared using :option:`rndc flush`.
The authoritative samples all use NOTIFY but identify the statements used, so The authoritative samples all use NOTIFY but identify the statements used, so
that they can be removed if not required. that they can be removed if not required.