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add CNAME example to README (#5537)

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Signed-off-by: Chris O'Haver <cohaver@infoblox.com>
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Chris O'Haver
2022-08-03 06:51:49 -04:00
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plugin/template/README.md
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@@ -242,6 +242,22 @@ Named capture groups can be used to template one response for multiple patterns.
}
~~~
### Fabricate a CNAME
This example responds with a CNAME to `google.com` for any DNS query made exactly for `foogle.com`.
The answer will also contain a record for `google.com` if the upstream nameserver can return a record for it of the
requested type.
~~~ corefile
. {
template IN ANY foogle.com {
match "^foogle\.com\.$"
answer "foogle.com 60 IN CNAME google.com"
}
forward . 8.8.8.8
}
~~~
## Also see
* [Go regexp](https://golang.org/pkg/regexp/) for details about the regex implementation