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coredns/middleware/federation/README.md

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# federation
The *federation* middleware enables
[federated](https://kubernetes.io/docs/tasks/federation/federation-service-discovery/) queries to be
resolved via the kubernetes middleware.
Enabling *federation* without also having *kubernetes* is a noop.
## Syntax
~~~
federation [ZONES...] {
NAME DOMAIN
~~~
* Each **NAME** and **DOMAIN** defines federation membership. One entry for each. A duplicate
**NAME** will silently overwrite any previous value.
## Examples
Here we handle all service requests in the `prod` and `stage` federations.
~~~ txt
. {
kubernetes cluster.local
federation cluster.local {
prod prod.feddomain.com
staging staging.feddomain.com
}
}
~~~
Or slightly shorter:
~~~ txt
cluster.local {
kubernetes
federation {
prod prod.feddomain.com
staging staging.feddomain.com
}
}
~~~