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plugin/cache: add a new keepttl option (#5879)

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adds a new option `keepttl` to the cache plugin

Signed-off-by: Arthur Outhenin-Chalandre <arthur.outhenin-chalandre@proton.ch>
This commit is contained in:
Arthur Outhenin-Chalandre
2023-01-27 17:35:24 +01:00
committed by GitHub
parent d3e4fc78c3
commit bf7c2cf37b
6 changed files with 87 additions and 1 deletions
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8
plugin/cache/README.md vendored
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@@ -39,6 +39,7 @@ cache [TTL] [ZONES...] {
serve_stale [DURATION] [REFRESH_MODE]
servfail DURATION
disable success|denial [ZONES...]
keepttl
}
~~~
@@ -69,6 +70,11 @@ cache [TTL] [ZONES...] {
greater than 5 minutes.
* `disable` disable the success or denial cache for the listed **ZONES**. If no **ZONES** are given, the specified
cache will be disabled for all zones.
* `keepttl` do not age TTL when serving responses from cache. The entry will still be removed from cache
when the TTL expires as normal, but until it expires responses will include the original TTL instead
of the remaining TTL. This can be useful if CoreDNS is used as an authoritative server and you want
to serve a consistent TTL to downstream clients. This is **NOT** recommended when CoreDNS is caching
records it is not authoritative for because it could result in downstream clients using stale answers.
## Capacity and Eviction
@@ -135,4 +141,4 @@ example.org {
disable denial sub.example.org
}
}
~~~
~~~