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return an error for multiple use of some plugins (#1559)

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* plugins: Return error for multiple use of some

Return plugin.ErrOnce when a plugin that doesn't support it, is called
mutliple times.

This now adds it for: cache, dnssec, errors, forward, hosts, nsid.
And changes it slightly in kubernetes, pprof, reload, root.

* more tests
This commit is contained in:
Miek Gieben
2018-02-28 18:16:05 -08:00
committed by GitHub
parent 5faa9e7bc1
commit f697b33283
27 changed files with 150 additions and 95 deletions
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2
plugin/kubernetes/README.md
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@@ -16,6 +16,8 @@ to deploy CoreDNS in Kubernetes](https://github.com/coredns/deployment/tree/mast
[stubDomains and upstreamNameservers](http://blog.kubernetes.io/2017/04/configuring-private-dns-zones-upstream-nameservers-kubernetes.html)
are implemented via the *proxy* plugin and kubernetes *upstream*. See example below.
This plugin can only be used once per Server Block.
## Syntax
~~~