Close #13087 (#13351)

content/ja/docs/setup/independent/install-kubeadm.md

@@ -2,6 +2,10 @@
 title: kubeadmのインストール
 content_template: templates/task
 weight: 20
+card:
+  name: setup
+  weight: 20
+  title: kubeadmセットアップツールのインストール
 ---
 
 {{% capture overview %}}
@@ -90,7 +94,6 @@ Other CRI-based runtimes include:
 - [containerd](https://github.com/containerd/cri) (CRI plugin built into containerd)
 - [cri-o](https://github.com/kubernetes-incubator/cri-o)
 - [frakti](https://github.com/kubernetes/frakti)
-- [rkt](https://github.com/kubernetes-incubator/rktlet)
 
 Refer to the [CRI installation instructions](/docs/setup/cri) for more information.
 
@@ -106,7 +109,7 @@ You will install these packages on all of your machines:
 * `kubectl`: the command line util to talk to your cluster.
 
 kubeadm **will not** install or manage `kubelet` or `kubectl` for you, so you will
-need to ensure they match the version of the Kubernetes control panel you want
+need to ensure they match the version of the Kubernetes control plane you want
 kubeadm to install for you. If you do not, there is a risk of a version skew occurring that
 can lead to unexpected, buggy behaviour. However, _one_ minor version skew between the
 kubelet and the control plane is supported, but the kubelet version may never exceed the API
@@ -119,8 +122,10 @@ This is because kubeadm and Kubernetes require
 [special attention to upgrade](/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade-1-11/).
 {{</ warning >}}
 
-For more information on version skews, please read our
-[version skew policy](/docs/setup/independent/create-cluster-kubeadm/#version-skew-policy).
+For more information on version skews, see:
+
+* Kubernetes [version and version-skew policy](/docs/setup/version-skew-policy/)
+* Kubeadm-specific [version skew policy](/docs/setup/independent/create-cluster-kubeadm/#version-skew-policy)
 
 {{< tabs name="k8s_install" >}}
 {{% tab name="Ubuntu, Debian or HypriotOS" %}}
@@ -154,7 +159,7 @@ sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
 
 yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
 
-systemctl enable kubelet && systemctl start kubelet
+systemctl enable --now kubelet
 ```
 
   **Note:**
@@ -172,6 +177,7 @@ systemctl enable kubelet && systemctl start kubelet
     EOF
     sysctl --system
     ```
+  - Make sure that the `br_netfilter` module is loaded before this step. This can be done by running `lsmod | grep br_netfilter`. To load it explicitly call `modprobe br_netfilter`.
 {{% /tab %}}
 {{% tab name="Container Linux" %}}
 Install CNI plugins (required for most pod network):
@@ -208,7 +214,7 @@ curl -sSL "https://raw.githubusercontent.com/kubernetes/kubernetes/${RELEASE}/bu
 Enable and start `kubelet`:
 
 ```bash
-systemctl enable kubelet && systemctl start kubelet
+systemctl enable --now kubelet
 ```
 {{% /tab %}}
 {{< /tabs >}}