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plugin/forward: add prefer_udp option (#1944)

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* plugin/forward: add prefer_udp option

* updated according to code review

 - fixed linter warning
 - removed metric parameter in Proxy.Connect()
This commit is contained in:
Ruslan Drozhdzh
2018-07-07 10:14:21 +03:00
committed by Miek Gieben
parent 7c41f2ce9f
commit bc50901234
8 changed files with 115 additions and 43 deletions
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4
plugin/forward/README.md
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@@ -47,6 +47,7 @@ Extra knobs are available with an expanded syntax:
forward FROM TO... {
except IGNORED_NAMES...
force_tcp
prefer_udp
expire DURATION
max_fails INTEGER
tls CERT KEY CA
@@ -60,6 +61,9 @@ forward FROM TO... {
* **IGNORED_NAMES** in `except` is a space-separated list of domains to exclude from forwarding.
Requests that match none of these names will be passed through.
* `force_tcp`, use TCP even when the request comes in over UDP.
* `prefer_udp`, try first using UDP even when the request comes in over TCP. If response is truncated
(TC flag set in response) then do another attempt over TCP. In case if both `force_tcp` and `prefer_udp`
options specified the `force_tcp` takes precedence.
* `max_fails` is the number of subsequent failed health checks that are needed before considering
an upstream to be down. If 0, the upstream will never be marked as down (nor health checked).
Default is 2.