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add a blog: Install Kubernetes 1.22 and containerd the Easy Way
Signed-off-by: FeynmanZhou <pengfeizhou@yunify.com>
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title: 'Install Kubernetes 1.22 and containerd the Easy Way'
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tag: 'Kubernetes, containerd'
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keywords: 'Kubernetes, containerd, docker, installation'
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description: 'Install Kubernetes and containerd in a Linux machine within minutes.'
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createTime: '2021-09-29'
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author: 'Feynman'
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snapshot: '/images/blogs/en/kubekey-containerd/k8s-containerd.png'
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---
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[KubeKey](https://github.com/kubesphere/kubekey) is a lightweight and turn-key installer that supports the installation of Kubernetes, KubeSphere and related add-ons. Writtent in Go, KubeKey enables you to set up a Kubernetes cluster within minutes. In this blog, we will install Kubernetes 1.22 and [containerd](https://containerd.io/) in one command with KubeKey.
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## Step 1: Prepare a Linux Machine
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To get started with all-in-one installation, you only need to prepare one host according to the following requirements for hardware and operating system.
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### Hardware Recommendations
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<table>
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<tbody>
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<tr>
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<th width='320'>OS</th>
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<th>Minimum Requirements</th>
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</tr>
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<tr>
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<td><b>Ubuntu</b> <i>16.04</i>, <i>18.04</i></td>
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<td>2 CPU cores, 4 GB memory, and 40 GB disk space</td>
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</tr>
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<tr>
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<td><b>Debian</b> <i>Buster</i>, <i>Stretch</i></td>
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<td>2 CPU cores, 4 GB memory, and 40 GB disk space</td>
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</tr><tr>
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<td><b>CentOS</b> <i>7.x</i></td>
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<td>2 CPU cores, 4 GB memory, and 40 GB disk space</td>
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</tr><tr>
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<td><b>Red Hat Enterprise Linux 7</b></td>
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<td>2 CPU cores, 4 GB memory, and 40 GB disk space</td>
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</tr><tr>
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<td><b>SUSE Linux Enterprise Server 15/openSUSE Leap 15.2</b></td>
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<td>2 CPU cores, 4 GB memory, and 40 GB disk space</td>
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</tr>
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</tbody>
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</table>
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### Node requirements
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- The node can be accessed through `SSH`.
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- `sudo`/`curl`/`openssl` should be used.
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### Dependency requirements
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KubeKey can install Kubernetes and KubeSphere together. The dependency that needs to be installed may be different based on the Kubernetes version to be installed. You can refer to the following list to see if you need to install relevant dependencies on your node in advance.
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<table>
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<tbody>
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<tr>
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<th>Dependency</th>
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<th>Kubernetes Version ≥ 1.18</th>
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<th>Kubernetes Version < 1.18</th>
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</tr>
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<tr>
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<td><code>socat</code></td>
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<td>Required</td>
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<td>Optional but recommended</td>
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</tr>
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<tr>
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<td><code>conntrack</code></td>
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<td>Required</td>
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<td>Optional but recommended</td>
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</tr><tr>
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<td><code>ebtables</code></td>
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<td>Optional but recommended</td>
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<td>Optional but recommended</td>
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</tr><tr>
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<td><code>ipset</code></td>
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<td>Optional but recommended</td>
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<td>Optional but recommended</td>
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</tr>
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</tbody>
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</table>
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### Network and DNS requirements
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- Make sure the DNS address in `/etc/resolv.conf` is available. Otherwise, it may cause some issues of DNS in the cluster.
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- If your network configuration uses firewall rules or security groups, you must ensure infrastructure components can communicate with each other through specific ports. It is recommended that you turn off the firewall. For more information, see [Port Requirements](../../installing-on-linux/introduction/port-firewall/).
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- Supported CNI plugins: Calico and Flannel. Others (such as Cilium and Kube-OVN) may also work but note that they have not been fully tested.
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## Step 2: Download KubeKey
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Perform the following steps to download KubeKey.
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{{< tabs >}}
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{{< tab "Good network connections to GitHub/Googleapis" >}}
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Download KubeKey from its [GitHub Release Page](https://github.com/kubesphere/kubekey/releases) or run the following command:
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```bash
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curl -L https://github.com/kubesphere/kubekey/releases/download/v1.2.0-alpha.4/kubekey-v1.2.0-alpha.4-linux-amd64.tar.gz > installer.tar.gz && tar -zxf installer.tar.gz
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```
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{{</ tab >}}
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{{< tab "Poor network connections to GitHub/Googleapis" >}}
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Run the following command first to make sure you download KubeKey from the correct zone.
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```bash
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export KKZONE=cn
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```
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Run the following command to download KubeKey:
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```bash
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curl -L https://github.com/kubesphere/kubekey/releases/download/v1.2.0-alpha.4/kubekey-v1.2.0-alpha.4-linux-amd64.tar.gz > installer.tar.gz && tar -zxf installer.tar.gz
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```
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{{< notice note >}}
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After you download KubeKey, if you transfer it to a new machine also with poor network connections to Googleapis, you must run `export KKZONE=cn` again before you proceed with the following steps.
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{{</ notice >}}
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{{</ tab >}}
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{{</ tabs >}}
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Make `kk` executable:
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```bash
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chmod +x kk
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```
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## Step 3: Get Started with Installation
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You only need to run one command for all-in-one installation.
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```bash
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./kk create cluster --with-kubernetes v1.22.1 --container-manager containerd
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```
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{{< notice note >}}
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- Supported Kubernetes versions: v1.19.8, v1.20.4, v1.21.4, v1.22.1. If you do not specify a Kubernetes version, KubeKey installs Kubernetes v1.21.5 by default. For more information about supported Kubernetes versions, see [Support Matrix](https://github.com/kubesphere/kubekey/blob/master/docs/kubernetes-versions.md).
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- For all-in-one installation, you do not need to change any configuration.
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- KubeKey supports AMD64 and ARM64.
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{{</ notice >}}
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After you run the command, you will see a table for environment check. For details, see [Node requirements](#node-requirements) and [Dependency requirements](#dependency-requirements). Type `yes` to continue.
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## Step 4: Verify the Installation
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If the following information is displayed, Kubernetes is successfully installed.
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```bash
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INFO[00:40:00 CST] Congratulations! Installation is successful.
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```
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Run the following command to check the container runtime and Kubernetes version.
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```bash
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kubectl get node -o wide
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NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
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i-mxtuejcj Ready control-plane,master,worker 45s v1.22.1 192.168.6.2 <none> CentOS Linux 7 (Core) 3.10.0-1160.el7.x86_64 containerd://1.4.9
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```
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Run the following command to check the Pod status.
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```bash
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kubectl get pod --all-namespaces
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NAMESPACE NAME READY STATUS RESTARTS AGE
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kube-system calico-kube-controllers-75ddb95444-6vgcm 1/1 Running 0 39s
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kube-system calico-node-knhhs 1/1 Running 0 39s
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kube-system coredns-5495dd7c88-6w5gt 1/1 Running 0 48s
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kube-system coredns-5495dd7c88-982kj 1/1 Running 0 48s
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kube-system kube-apiserver-i-mxtuejcj 1/1 Running 0 56s
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kube-system kube-controller-manager-i-mxtuejcj 1/1 Running 0 56s
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kube-system kube-proxy-6vlsj 1/1 Running 0 48s
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kube-system kube-scheduler-i-mxtuejcj 1/1 Running 0 64s
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kube-system nodelocaldns-7zqp2 1/1 Running 0 48s
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```
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Congratulations! You have installed a sing-node Kubernetes cluster with containerd. For advanced usage of KubeKey, see [Installing on Linux — Overview](https://kubesphere.io/docs/installing-on-linux/introduction/intro/) for more information.
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