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plugin/proxy: decrease health timeouts (#1107)

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Turn down the timeouts and numbers a bit:
FailTimeout 10s -> 5s
Future 60s -> 12s
TryDuration 60s -> 16s
The timeout for decrementing the fails in a host: 10s -> 2s

And the biggest change: don't set fails when the error is Timeout(),
meaning we loop for a bit and may try the same server again, but we
don't mark our upstream as bad, see comments in proxy.go. Testing this
with "ANY isc.org" and "MX miek.nl" we see:

~~~
::1 - [24/Sep/2017:08:06:17 +0100] "ANY IN isc.org. udp 37 false 4096" SERVFAIL qr,rd 37 10.001621221s
24/Sep/2017:08:06:17 +0100 [ERROR 0 isc.org. ANY] unreachable backend: read udp 192.168.1.148:37420->8.8.8.8:53: i/o timeout

::1 - [24/Sep/2017:08:06:17 +0100] "MX IN miek.nl. udp 37 false 4096" NOERROR qr,rd,ra,ad 170 35.957284ms

127.0.0.1 - [24/Sep/2017:08:06:18 +0100] "ANY IN isc.org. udp 37 false 4096" SERVFAIL qr,rd 37 10.002051726s
24/Sep/2017:08:06:18 +0100 [ERROR 0 isc.org. ANY] unreachable backend: read udp 192.168.1.148:54901->8.8.8.8:53: i/o timeout

::1 - [24/Sep/2017:08:06:19 +0100] "MX IN miek.nl. udp 37 false 4096" NOERROR qr,rd,ra,ad 170 56.848416ms
127.0.0.1 - [24/Sep/2017:08:06:21 +0100] "MX IN miek.nl. udp 37 false 4096" NOERROR qr,rd,ra,ad 170 48.118349ms
::1 - [24/Sep/2017:08:06:21 +0100] "MX IN miek.nl. udp 37 false 4096" NOERROR qr,rd,ra,ad 170 1.055172915s
~~~

So the ANY isc.org queries show up twice, because we retry internally -
this is I think WAI.

The `miek.nl MX` queries are just processed normally as no backend is
marked as unreachable.

May fix #1035 #486
This commit is contained in:
Miek Gieben
2017-09-24 20:05:36 +01:00
committed by GitHub
parent 148a99442d
commit 2a32cd4159
5 changed files with 41 additions and 15 deletions
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8
plugin/proxy/upstream.go
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@@ -31,9 +31,9 @@ func NewStaticUpstreams(c *caddyfile.Dispenser) ([]Upstream, error) {
upstream := &staticUpstream{
from: ".",
HealthCheck: healthcheck.HealthCheck{
FailTimeout: 10 * time.Second,
MaxFails: 1,
Future: 60 * time.Second,
FailTimeout: 5 * time.Second,
MaxFails: 3,
Future: 12 * time.Second,
},
ex: newDNSEx(),
}
@@ -121,7 +121,7 @@ func parseBlock(c *caddyfile.Dispenser, u *staticUpstream) error {
if err != nil {
return err
}
u.HealthCheck.Interval = 30 * time.Second
u.HealthCheck.Interval = 4 * time.Second
if c.NextArg() {
dur, err := time.ParseDuration(c.Val())
if err != nil {