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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root

Name

root - simply specifies the root of where to find (zone) files.

Description

The default root is the current working directory of CoreDNS. The root plugin allows you to change this. A relative root path is relative to the current working directory.

This plugin can only be used once per Server Block.

Syntax

root PATH

PATH is the directory to set as CoreDNS' root.

Examples

Serve zone data (when the file plugin is used) from /etc/coredns/zones:

. {
    root /etc/coredns/zones
}

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