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coredns/middleware/secondary/README.md

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# secondary
`secondary` enables serving a zone retrieved from a primary server.
## Syntax
~~~
secondary [zones...]
~~~
* `zones` zones it should be authoritative for. If empty, the zones from the configuration block
are used. Not that with an remote address to *get* the zone the above is not that useful.
A working syntax would be:
~~~
secondary [zones...] {
transfer from address
[transfer to address]
}
~~~
* `transfer from` tell from which address to fetch the zone. It can be specified multiple time,
if one does not work another will be tried.
* `transfer to` can be enabled to allow this secondary zone to be transfered again.
## Examples
~~~
secondary [zones...] {
transfer from 10.0.1.1
transfer from 10.1.2.1
}
~~~