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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/forward/README.md
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@@ -19,6 +19,8 @@ is performed and upstreams will always be considered healthy.
When *all* upstreams are down it assumes health checking as a mechanism has failed and will try to
connect to a random upstream (which may or may not work).
This plugin can only be used once per Server Block.
## Syntax
In its most basic form, a simple forwarder uses this syntax: