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Add documentation about annotation-filter (#448)

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There were no documentation describing how to use the annotation-filter
parameter
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Søren Mathiasen 2018-01-26 11:00:59 +01:00 committed by Martin Linkhorst
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docs/faq.md
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@ -200,3 +200,15 @@ spec:
service
ingress
```
### Running an internal and external dns service
Sometimes you need to run an internal and an external dns service.
The internal one should provision hostnames used on the internal network (perhaps inside a VPC), and the external
one to expose DNS to the internet.
To do this with external-dns you can use the `--annotation-filter` to specifically tie an instance of external-dns to
an instance of a ingress controller. Let's assume you have two ingress controllers `nginx-internal` and `nginx-external`
then you can start two external-dns providers one with `--annotation-filter=kubernetes.io/ingress.class=nginx-internal`
and one with `--annotation-filter=kubernetes.io/ingress.class=nginx-external`