plugin/file: allow README.md testing (#3052 )

* Fix corefile usage

* plugin/file: allow README.md testing

Allow readme testing for the file plugin and fix bugs that where found:

* the reader wasn't reset when re-reading the same io.reader for a
  different origin.

Signed-off-by: Miek Gieben <miek@miek.nl>

* Update test/example_test.go

Co-Authored-By: Michael Grosser <development@stp-ip.net>

2019-07-27 11:47:55 +00:00

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file

Name

file - enables serving zone data from an RFC 1035-style master file.

Description

The file plugin is used for an "old-style" DNS server. It serves from a preloaded file that exists on disk. If the zone file contains signatures (i.e., is signed using DNSSEC), correct DNSSEC answers are returned. Only NSEC is supported! If you use this setup you are responsible for re-signing the zonefile.

Syntax

file DBFILE [ZONES...]

DBFILE the database file to read and parse. If the path is relative, the path from the root directive will be prepended to it.
ZONES zones it should be authoritative for. If empty, the zones from the configuration block are used.

If you want to round-robin A and AAAA responses look at the loadbalance plugin.

file DBFILE [ZONES... ] {
    transfer to ADDRESS...
    reload DURATION
}

transfer enables zone transfers. It may be specified multiples times. To or from signals the direction. ADDRESS must be denoted in CIDR notation (e.g., 127.0.0.1/32) or just as plain addresses. The special wildcard * means: the entire internet (only valid for 'transfer to'). When an address is specified a notify message will be sent whenever the zone is reloaded.
reload interval to perform a reload of the zone if the SOA version changes. Default is one minute. Value of 0 means to not scan for changes and reload. For example, 30s checks the zonefile every 30 seconds and reloads the zone when serial changes.

Examples

Load the example.org zone from example.org.signed and allow transfers to the internet, but send notifies to 10.240.1.1

example.org {
    file example.org.signed {
        transfer to *
        transfer to 10.240.1.1
    }
}

Or use a single zone file for multiple zones:

. {
    file example.org.signed example.org example.net {
        transfer to *
        transfer to 10.240.1.1
    }
}

Note that if you have a configuration like the following you may run into a problem of the origin not being correctly recognized:

. {
    file db.example.org
}

We omit the origin for the file db.example.org, so this references the zone in the server block, which, in this case, is the root zone. Any contents of db.example.org will then read with that origin set; this may or may not do what you want. It's better to be explicit here and specify the correct origin. This can be done in two ways:

. {
    file db.example.org example.org
}

example.org {
    file db.example.org
}

Also See

See the loadbalance plugin if you need simple record shuffling.

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