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Add configuration flag to set if RecursionDesired should be set on health checkers in Forward-plugin (#3679)

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* Make the RD-flag in health-checks in the Forward-plugin configurable

Introduces a new configuration flag; `health_check_non_recursive`. This
flag makes the health-checker do non-recursive requests when checking
the health of upstream servers.

Signed-off-by: Geir Haugom <ghagit@haugom.org>
Signed-off-by: Christian Tryti <ctryti@gmail.com>

* Changes after feedback from reviewer

* Better tests of health-checks with and without recursion
* Removed the health_check_non_recursive configuration in favor of
extending the existing health_check configuration. Now supports an
optional `no_rec` argument.

Signed-off-by: Christian Tryti <ctryti@gmail.com>

* Add new test that checks setup of health_check.

Signed-off-by: Christian Tryti <ctryti@gmail.com>
This commit is contained in:
Christian Tryti
2020-03-06 11:52:43 +01:00
committed by GitHub
parent a74a209129
commit 116bda4d27
7 changed files with 135 additions and 26 deletions
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7
plugin/forward/README.md
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@@ -51,7 +51,7 @@ forward FROM TO... {
tls CERT KEY CA
tls_servername NAME
policy random|round_robin|sequential
health_check DURATION
health_check DURATION [no_rec]
max_concurrent MAX
}
~~~
@@ -85,7 +85,10 @@ forward FROM TO... {
* `random` is a policy that implements random upstream selection.
* `round_robin` is a policy that selects hosts based on round robin ordering.
* `sequential` is a policy that selects hosts based on sequential ordering.
* `health_check`, use a different **DURATION** for health checking, the default duration is 0.5s.
* `health_check` configure the behaviour of health checking of the upstream servers
* `<duration>` - use a different duration for health checking, the default duration is 0.5s.
* `no_rec` - optional argument that sets the RecursionDesired-flag of the dns-query used in health checking to `false`.
The flag is default `true`.
* `max_concurrent` **MAX** will limit the number of concurrent queries to **MAX**. Any new query that would
raise the number of concurrent queries above the **MAX** will result in a SERVFAIL response. This
response does not count as a health failure. When choosing a value for **MAX**, pick a number