9fb266aebe
Fix transferring the zone from a master and the matching of notifies to source and dst IP addresses. Add `upstream` keyword as well, because it is needed for the same reasons as in the *file* middlware. Add some dire warning about upstream in the readme of both middlewares. Out of band testing, hidden by net build tag was added. Integration testing still needs to be setup.
54 lines
2 KiB
Markdown
54 lines
2 KiB
Markdown
# file
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*file* enables serving zone data from an RFC 1035-style master file.
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The file middleware is used for an "old-style" DNS server. It serves from a preloaded file that exists
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on disk. If the zone file contains signatures (i.e. is signed, i.e. DNSSEC) correct DNSSEC answers
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are returned. Only NSEC is supported! If you use this setup *you* are responsible for resigning the
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zonefile.
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## Syntax
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~~~
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file DBFILE [ZONES...]
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~~~
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* **DBFILE** the database file to read and parse. If the path is relative the path from the *root*
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directive will be prepended to it.
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* **ZONES** zones it should be authoritative for. If empty, the zones from the configuration block
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are used.
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If you want to round robin A and AAAA responses look at the *loadbalance* middleware.
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TSIG key configuration is TODO; directive format for transfer will probably be extended with
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TSIG key information, something like `transfer out [ADDRESS...] key [NAME[:ALG]] [BASE64]`
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~~~
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file DBFILE [ZONES... ] {
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transfer to ADDRESS...
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no_reload
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upstream ADDRESS...
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}
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~~~
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* `transfer` enables zone transfers. It may be specified multiples times. `To` or `from` signals
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the direction. **ADDRESS** must be denoted in CIDR notation (127.0.0.1/32 etc.) or just as plain
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addresses. The special wildcard `*` means: the entire internet (only valid for 'transfer to').
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When an address is specified a notify message will be send whenever the zone is reloaded.
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* `no_reload` by default CoreDNS will reload a zone from disk whenever it detects a change to the
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file. This option disables that behavior.
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* `upstream` defines upstream resolvers to be used resolve external names found (think CNAMEs)
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pointing to external names. This is only really useful when CoreDNS is configured as a proxy, for
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normal authoritative serving you don't need *or* want to use this.
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## Examples
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Load the `example.org` zone from `example.org.signed` and allow transfers to the internet, but send
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notifies to 10.240.1.1
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~~~
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file example.org.signed example.org {
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transfer to *
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transfer to 10.240.1.1
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}
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~~~
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