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plugin/cache: Add option to adjust SERVFAIL response cache TTL (#5320)

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* add servfail cache opt

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
This commit is contained in:
Chris O'Haver
2022-06-17 15:48:57 -04:00
committed by GitHub
parent d60ce0c8d4
commit dded10420b
5 changed files with 78 additions and 2 deletions
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4
plugin/cache/README.md vendored
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@@ -38,6 +38,7 @@ cache [TTL] [ZONES...] {
denial CAPACITY [TTL] [MINTTL]
prefetch AMOUNT [[DURATION] [PERCENTAGE%]]
serve_stale [DURATION] [REFRESH_MODE]
servfail DURATION
}
~~~
@@ -63,6 +64,9 @@ cache [TTL] [ZONES...] {
checking to see if the entry is available from the source. **REFRESH_MODE** defaults to `immediate`. Setting this
value to `verify` can lead to increased latency when serving stale responses, but will prevent stale entries
from ever being served if an updated response can be retrieved from the source.
* `servfail` cache SERVFAIL responses for **DURATION**. Setting **DURATION** to 0 will disable caching of SERVFAIL
responses. If this option is not set, SERVFAIL responses will be cached for 5 seconds. **DURATION** may not be
greater than 5 minutes.
## Capacity and Eviction