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Add exponential backoff to healthcheck (#3643)

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Move exponential backoff initialization to Start()

Signed-off-by: RickyRajinder <singh.sangh@gmail.com>

Move comment

Increase max interval and update README

Remove trailing whitespace

Change Start() param name back to interval
This commit is contained in:
Ricky S
2020-02-04 05:19:48 -08:00
committed by GitHub
parent 22cd28a798
commit efbe4ac5e8
4 changed files with 29 additions and 21 deletions
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6
plugin/forward/README.md
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@@ -9,8 +9,10 @@
The *forward* plugin re-uses already opened sockets to the upstreams. It supports UDP, TCP and
DNS-over-TLS and uses in band health checking.
When it detects an error a health check is performed. This checks runs in a loop, every *0.5s*, for
as long as the upstream reports unhealthy. Once healthy we stop health checking (until the next
When it detects an error a health check is performed. This checks runs in a loop,
starting with a *0.5s* interval and exponentially backing off with randomized intervals
up to *60s* for as long as the upstream reports unhealthy. The exponential backoff
will reset to *0.5s* after 15 minutes. Once healthy we stop health checking (until the next
error). The health checks use a recursive DNS query (`. IN NS`) to get upstream health. Any response
that is not a network error (REFUSED, NOTIMPL, SERVFAIL, etc) is taken as a healthy upstream. The
health check uses the same protocol as specified in **TO**. If `max_fails` is set to 0, no checking