Convert site to Hugo (#8316)

This commit converts content and layout to use Hugo.
2018-05-05 18:00:51 +02:00
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+---
+reviewers:
+- johnbelamaric
+title: Using CoreDNS for Service Discovery
+min-kubernetes-server-version: v1.9
+content_template: templates/task
+---
+
+{{< feature-state state="beta" >}}
+
+{{% capture overview %}}
+This page describes how to enable CoreDNS instead of kube-dns for service
+discovery.
+{{% /capture %}}
+
+{{% capture prerequisites %}}
+{{< include "task-tutorial-prereqs.md" >}} {{< version-check >}}
+{{% /capture %}}
+
+{{% capture steps %}}
+
+## Installing CoreDNS with kubeadm
+
+In Kubernetes 1.9, [CoreDNS](https://coredns.io) is available as an alpha feature, and
+in Kubernetes 1.10 it is available as a beta feature. In either case, you may install
+it during cluster creation by setting the `CoreDNS` feature gate to `true` during `kubeadm init`:
+
+```
+kubeadm init --feature-gates=CoreDNS=true
+```
+
+This installs CoreDNS instead of kube-dns.
+
+## Upgrading an Existing Cluster with kubeadm
+
+In Kubernetes 1.10, you can also move to CoreDNS when you use `kubeadm` to upgrade
+a cluster that is using `kube-dns`. In this case, `kubeadm` will generate the CoreDNS configuration
+("Corefile") based upon the `kube-dns` ConfigMap, preserving configurations for federation,
+stub domains, and upstream name server.
+
+Note that if you are running CoreDNS in your cluster already, prior to upgrade, your existing Corefile will be
+**overwritten** by the one created during upgrade. **You should save your existing ConfigMap
+if you have customized it.** You may re-apply your customizations after the new ConfigMap is
+up and running.
+
+This process will be modified for the GA release of this feature, such that an existing
+Corefile will not be overwritten.
+
+{{% /capture %}}
+
+{{% capture whatsnext %}}
+
+You can configure [CoreDNS](https://coredns.io) to support many more use cases than
+kube-dns by modifying the `Corefile`. For more information, see the
+[CoreDNS site](https://coredns.io/2017/05/08/custom-dns-entries-for-kubernetes/).
+
+{{% /capture %}}
+
+