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kubeadm: update info about CoreDNS in kubeadm-init.md #8728

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kubeadm: update info about CoreDNS in kubeadm-init.md #8728

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14 changes: 11 additions & 3 deletions content/en/docs/reference/setup-tools/kubeadm/kubeadm-init.md
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Expand Up @@ -79,14 +79,15 @@ following steps:

See [kubeadm join](/docs/reference/setup-tools/kubeadm/kubeadm-join/) for additional info.

1. Installs the internal DNS server (kube-dns) and the kube-proxy addon components via the API server. If kubeadm is invoked with --feature-gates=CoreDNS=true, then [CoreDNS](https://coredns.io/) will be installed as the default internal DNS server instead of kube-dns.
1. Installs a DNS server (CoreDNS) and the kube-proxy addon components via the API server.
In Kubernetes version 1.11 and later CoreDNS is the default DNS server.
To install kube-dns instead of CoreDNS, kubeadm must be invoked with `--feature-gates=CoreDNS=false`.
Please note that although the DNS server is deployed, it will not be scheduled until CNI is installed.

1. If `kubeadm init` is invoked with the alpha self-hosting feature enabled,
(`--feature-gates=SelfHosting=true`), the static Pod based control plane is
transformed into a [self-hosted control plane](#self-hosting).


### Using kubeadm init with a configuration file {#config-file}

{{< caution >}}
Expand Down Expand Up @@ -438,7 +439,14 @@ Here `v1.8.x` means the "latest patch release of the v1.8 branch".

`${ARCH}` can be one of: `amd64`, `arm`, `arm64`, `ppc64le` or `s390x`.

If using `--feature-gates=CoreDNS=true` image `coredns/coredns:1.0.2` is required (instead of the three `k8s-dns-*` images).
If you run Kubernetes version 1.10 or earlier, and if you set `--feature-gates=CoreDNS=true`,
you must also use the image `coredns/coredns:1.0.2`, instead of the three `k8s-dns-*` images.

In Kubernetes 1.11 and later, you can list and pull the images using the `kubeadm config images` sub-command:
```
kubeadm config images list
kubeadm config images pull
```

### Automating kubeadm

Expand Down