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administer-cluster/coredns: include more changes #8985

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Jun 11, 2018
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administer-cluster/coredns: include more changes #8985

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19 changes: 16 additions & 3 deletions content/en/docs/tasks/administer-cluster/coredns.md
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Expand Up @@ -16,16 +16,29 @@ This page describes the CoreDNS upgrade process and how to install kube-dns inst

{{% capture steps %}}

## Installing kube-dns with kubeadm
## About CoreDNS

In Kubernetes 1.11, [CoreDNS](https://coredns.io) has graduated to General Availability (GA)
[CoreDNS](https://coredns.io) is a flexible, extensible DNS server that can serve as the Kubernetes cluster DNS.
Like Kubernetes, the CoreDNS project is hosted by the [CNCF.](http://www.cncf.io)

You can use CoreDNS instead of kube-dns in your cluster by replacing kube-dns in an existing
deployment, or by using tools like kubeadm that will deploy and upgrade the cluster for you.

## Installing CoreDNS

For manual deployment or replacement of kube-dns, see the documentation at the
[CoreDNS GitHub project.](https://github.com/coredns/deployment/tree/master/kubernetes)

## Installing CoreDNS with kubeadm

In Kubernetes 1.11, CoreDNS has graduated to General Availability (GA)
and is installed by default. To install kube-dns instead, set the `CoreDNS` feature gate
value to `false`:
```
kubeadm init --feature-gates=CoreDNS=false
```
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Here the way it is presented in the website, one can think the command-line operation is to install CoreDNS whereas it is the opposite. So I propose to detach the 2 sentences.

See below:

In Kubernetes 1.11, CoreDNS has graduated to General Availability (GA)
and is installed by default

In order to NOT install CoreDNS but rather install kube-dns as the cluster's DNS Server, set the CoreDNS feature gate value to false:

kubeadm init --feature-gates=CoreDNS=false

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Sorry, @fturib -- I see your concern, but the original as @neolit123 has written/edited is completely clear. We don't need the additional words -- they only get in the way.

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ok.

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see inline conversation; keep the original


## Upgrading an Existing Cluster with kubeadm
## Upgrading an existing cluster with kubeadm
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THANK YOU FOR CATCHING! :-)


In Kubernetes version 1.10 and later, 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
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