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53 lines
1.5 KiB
Markdown
53 lines
1.5 KiB
Markdown
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# local
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## Name
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*local* - respond to local names.
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## Description
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*local* will respond with a basic reply to a "local request". Local request are defined to be
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names in the following zones: localhost, 0.in-addr.arpa, 127.in-addr.arpa and 255.in-addr.arpa *and*
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any query asking for `localhost.<domain>`. When seeing the latter a metric counter is increased and
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if *debug* is enabled a debug log is emitted.
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With *local* enabled any query falling under these zones will get a reply. The prevents the query
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from "escaping" to the internet and putting strain on external infrastructure.
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The zones are mostly empty, only `localhost.` address records (A and AAAA) are defined and a
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`1.0.0.127.in-addr.arpa.` reverse (PTR) record.
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## Syntax
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~~~ txt
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local
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~~~
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## Metrics
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If monitoring is enabled (via the *prometheus* plugin) then the following metric is exported:
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* `coredns_local_localhost_requests_total{}` - a counter of the number of `localhost.<domain>`
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requests CoreDNS has seen. Note this does *not* count `localhost.` queries.
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Note that this metric *does not* have a `server` label, because it's more interesting to find the
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client(s) performing these queries than to see which server handled it. You'll need to inspect the
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debug log to get the client IP address.
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## Examples
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~~~ corefile
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. {
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local
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}
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~~~
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## Bugs
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Only the `in-addr.arpa.` reverse zone is implemented, `ip6.arpa.` queries are not intercepted.
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## See Also
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BIND9's configuration in Debian comes with these zones preconfigured. See the *debug* plugin for
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enabling debug logging.
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