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prerequisites.md

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Prerequisites
KubeSphere, Kubernetes, Installation, Prerequisites
Make sure your environment where an existing Kubernetes cluster runs meets the prerequisites before installation.
Prerequisites
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You can install KubeSphere on virtual machines and bare metal with Kubernetes also provisioned. In addition, KubeSphere can also be deployed on cloud-hosted and on-premises Kubernetes clusters as long as your Kubernetes cluster meets the prerequisites below.

  • To install KubeSphere 3.4 on Kubernetes, your Kubernetes version must be v1.20.x, v1.21.x, v1.22.x, v1.23.x, * v1.24.x, * v1.25.x, and * v1.26.x. For Kubernetes versions with an asterisk, some features of edge nodes may be unavailable due to incompatability. Therefore, if you want to use edge nodes, you are advised to install Kubernetes v1.23.x.
  • Available CPU > 1 Core and Memory > 2 G. Only x86_64 CPUs are supported, and Arm CPUs are not fully supported at present.
  • A default StorageClass in your Kubernetes cluster is configured; use kubectl get sc to verify it.
  • The CSR signing feature is activated in kube-apiserver when it is started with the --cluster-signing-cert-file and --cluster-signing-key-file parameters. See RKE installation issue.

Pre-checks

  1. Make sure your Kubernetes version is compatible by running kubectl version in your cluster node. The output may look as below:

    $ kubectl version
Client Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.8", GitCommit:"fd5d41537aee486160ad9b5356a9d82363273721", GitTreeState:"clean", BuildDate:"2021-02-17T12:41:51Z", GoVersion:"go1.15.8", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.8", GitCommit:"fd5d41537aee486160ad9b5356a9d82363273721", GitTreeState:"clean", BuildDate:"2021-02-17T12:33:08Z", GoVersion:"go1.15.8", Compiler:"gc", Platform:"linux/amd64"}

    {{< notice note >}} Pay attention to the Server Version line. If GitVersion shows an older one, you need to upgrade Kubernetes first. {{</ notice >}}

  2. Check if the available resources in your cluster meet the minimum requirements.

    $ free -g
            total        used        free      shared  buff/cache   available
Mem:              16          4          10           0           3           2
Swap:             0           0           0

  3. Check if there is a default StorageClass in your cluster. An existing default StorageClass is a prerequisite for KubeSphere installation.

    $ kubectl get sc
NAME                      PROVISIONER               AGE
glusterfs (default)       kubernetes.io/glusterfs   3d4h

If your Kubernetes cluster environment meets all the requirements above, then you are ready to deploy KubeSphere on your existing Kubernetes cluster.

For more information, see Overview.