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

* 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

2018-02-28 18:16:05 -08:00

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errors

Name

errors - enable error logging.

Description

Any errors encountered during the query processing will be printed to standard output.

This plugin can only be used once per Server Block.

Syntax

errors

Examples

Use the whoami to respond to queries and Log errors to standard output.

. {
    whoami
    errors
}

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