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plugin/proxy: kick of HC on every 3rd failure (#1110)

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* healthchecks: check on every 3rd failure

Check on every third failure and some cleanups to make this possible. A
failed healthcheck will never increase Fails, a successfull healthceck
will reset Fails to 0. This is a chance this counter now drops below 0,
making the upstream super? healthy.

This removes the okUntil smartness and condences everything back to 1
metrics: Fails; so it's simpler in that regard.

Timout errors are *not* attributed to the local upstream, and don't get
counted into the Fails anymore. Meaning the 'dig any isc.org' won't kill
your upstream.

Added extra test the see if the Fails counter gets reset after 3 failed
connection.

There is still a disconnect beween HTTP healthceck working the proxy (or
lookup) not being able to connect to the upstream.

* Fix tests
This commit is contained in:
Miek Gieben
2017-10-15 19:38:39 +02:00
committed by GitHub
parent c7ff44fb3a
commit e34e2c251f
13 changed files with 180 additions and 190 deletions
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plugin/proxy/README.md
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@@ -38,7 +38,7 @@ proxy FROM TO... {
random, least_conn, or round_robin. Default is random.
* `fail_timeout` specifies how long to consider a backend as down after it has failed. While it is
down, requests will not be routed to that backend. A backend is "down" if CoreDNS fails to
communicate with it. The default value is 10 seconds ("10s").
communicate with it. The default value is 2 seconds ("2s").
* `max_fails` is the number of failures within fail_timeout that are needed before considering
a backend to be down. If 0, the backend will never be marked as down. Default is 1.
* `health_check` will check **PATH** (on **PORT**) on each backend. If a backend returns a status code of