安装KubeSphere最好的方法就是参考官方文档，而且官方文档是中文的。
官网地址：https://kubesphere.com.cn/

https://github.com/kubesphere/kubesphere/blob/master/README_zh.md
Kubernetes(K8S) kubesphere 介绍
安装提前条件：
使用 Kubeadm 部署 Kubernetes(K8S) 安装--附K8S架构图
使用 Kubeadm 部署 Kubernetes(K8S) 安装 -- 持久化存储(NFS网络存储)
Kubernetes(K8S) 安装 Metrics-Server

# 检查 K8S 版本，低版本需要升级
[root@k8smaster kubesphere]# kubectl version

安装

[root@k8smaster ~]# cd /opt/k8s/kubesphere
# 创建文件storageclass.yaml
[root@k8smaster kubesphere]# vi storageclass.yaml
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer 
# persistentVolumeClaim.yaml
[root@k8smaster kubesphere]# vi persistentVolumeClaim.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: local-pve
spec:
  accessModes:
     - ReadWriteOnce
  resources:
    requests:
      storage: 20Gi
  storageClassName: local-storage
# 下载核心文件（可以讯雷下载好传到 服务器）
[root@k8smaster kubesphere]# wget https://github.com/kubesphere/ks-installer/releases/download/v3.1.1/kubesphere-installer.yaml
[root@k8smaster kubesphere]# wget https://github.com/kubesphere/ks-installer/releases/download/v3.1.1/cluster-configuration.yaml
[root@k8smaster kubesphere]# ll
总用量 12
-rwxrwxrwx 1 root root 7663 4月  23 09:41 cluster-configuration.yaml
-rwxrwxrwx 1 root root 4064 4月  23 09:41 kubesphere-installer.yaml
# 安装
[root@k8smaster kubesphere]# kubectl apply -f storageclass.yaml
storageclass.storage.k8s.io/local-storage created
[root@k8smaster kubesphere]# kubectl apply -f persistentVolumeClaim.yaml
persistentvolumeclaim/local-pve created
[root@k8smaster kubesphere]# kubectl apply -f kubesphere-installer.yaml
customresourcedefinition.apiextensions.k8s.io/clusterconfigurations.installer.kubesphere.io created
namespace/kubesphere-system created
serviceaccount/ks-installer created
clusterrole.rbac.authorization.k8s.io/ks-installer created
clusterrolebinding.rbac.authorization.k8s.io/ks-installer created
deployment.apps/ks-installer created
[root@k8smaster kubesphere]# kubectl apply -f cluster-configuration.yaml
clusterconfiguration.installer.kubesphere.io/ks-installer created
#解决找不到证书的问题
[root@k8smaster kubesphere]# kubectl -n kubesphere-system create secret generic kube-etcd-client-certs  --from-file=etcd-client-ca.crt=/etc/kubernetes/pki/etcd/ca.crt  --from-file=etcd-client.crt=/etc/kubernetes/pki/apiserver-etcd-client.crt  --from-file=etcd-client.key=/etc/kubernetes/pki/apiserver-etcd-client.key
secret/kube-etcd-client-certs created
# 查看 POD 详情
[root@k8smaster kubesphere]# kubectl describe pod -n kubesphere-system
Events:
  Type    Reason     Age   From               Message
  ----    ------     ----  ----               -------
  Normal  Scheduled  12m   default-scheduler  Successfully assigned kubesphere-system/ks-installer-7bd6b699df-9lnlc to k8snode1
  Normal  Pulling    12m   kubelet            Pulling image "kubesphere/ks-installer:v3.1.1"
  Normal  Pulled     11m   kubelet            Successfully pulled image "kubesphere/ks-installer:v3.1.1"
  Normal  Created    11m   kubelet            Created container installer
  Normal  Started    11m   kubelet            Started container installer
[root@k8smaster kubesphere]#
# 使用命令查看进度
[root@k8smaster kubesphere]# kubectl logs -n kubesphere-system $(kubectl get pod -n kubesphere-system -l app=ks-install -o jsonpath='{.items[0].metadata.name}') -f 

如果出现下面错误，需要安装 storageclass、persistentVolumeClaim

TASK [preinstall : KubeSphere | Stopping if default StorageClass was not found] ***
fatal: [localhost]: FAILED! => {
    "assertion": "\"(default)\" in default_storage_class_check.stdout",
    "changed": false,
    "evaluated_to": false,
    "msg": "Default StorageClass was not found !"
}

# 删除
[root@k8smaster kubesphere]# kubectl delete -f kubesphere-installer.yaml
[root@k8smaster kubesphere]# kubectl delete -f cluster-configuration.yaml
# 安装完 storageclass  后，重新安装
[root@k8smaster kubesphere]# kubectl apply -f storageclass.yaml
[root@k8smaster kubesphere]# kubectl apply -f persistentVolumeClaim.yaml
[root@k8smaster kubesphere]# kubectl apply -f kubesphere-installer.yaml
[root@k8smaster kubesphere]# kubectl apply -f cluster-configuration.yaml