Kubernetes 集群在线部署mini KubeSphere

2021-10-24 01:22:53

KubeSphere 愿景是打造一个以 Kubernetes 为内核的云原生分布式操作系统，它的架构可以非常方便地使第三方应用与云原生生态组件进行即插即用（plug-and-play）的集成，支持云原生应用在多云与多集群的统一分发和运维管理。

除了在 Linux 机器上安装 KubeSphere 之外，您还可以将其直接部署在现有的 Kubernetes 集群上。

一、安装前提

如需在 Kubernetes 上安装 KubeSphere v3.1.1，您的 Kubernetes 版本必须为：1.17.x、1.18.x、1.19.x 或 1.20.x。
确保您的机器满足最低硬件要求：CPU > 1 核，内存 > 2 GB。
在安装之前，需要配置 Kubernetes 集群中的默认存储类型。

二、配置默认storageclass

配置默认storageclass，以下以nfs为默认storageclass为例：

一. 搭建storageclass
1、node节点安装nfs服务

yum -y install nfs-utils rpcbind

2、启动nfs并设为开机自启：

systemctl start nfs && systemctl enable nfs
systemctl start rpcbind && systemctl enable rpcbind

3、node节点创建共享挂载目录

mkdir -pv /data/nfs

4、编辑/etc/exports文件（网段根据自己的情况写）

[root@master2 ~]# cat /etc/exports

/data/nfs  *(rw,no_root_squash,no_all_squash)

5、查看

[root@master2 ~]# showmount -e

Export list for k8s-node1:
/data/nfs *

6、修改deployment.yaml文件

cat deployment.yaml

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-provisioner
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
   name: nfs-provisioner-runner
   namespace: default
rules:
   -  apiGroups: [""]
      resources: ["persistentvolumes"]
      verbs: ["get", "list", "watch", "create", "delete"]
   -  apiGroups: [""]
      resources: ["persistentvolumeclaims"]
      verbs: ["get", "list", "watch", "update"]
   -  apiGroups: ["storage.k8s.io"]
      resources: ["storageclasses"]
      verbs: ["get", "list", "watch"]
   -  apiGroups: [""]
      resources: ["events"]
      verbs: ["watch", "create", "update", "patch"]
   -  apiGroups: [""]
      resources: ["services", "endpoints"]
      verbs: ["get","create","list", "watch","update"]
   -  apiGroups: ["extensions"]
      resources: ["podsecuritypolicies"]
      resourceNames: ["nfs-provisioner"]
      verbs: ["use"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: run-nfs-provisioner
subjects:
  - kind: ServiceAccount
    name: nfs-provisioner
    namespace: default
roleRef:
  kind: ClusterRole
  name: nfs-provisioner-runner
  apiGroup: rbac.authorization.k8s.io
---
kind: Deployment
apiVersion: apps/v1
metadata:
  name: nfs-client-provisioner
spec:
  selector:
    matchLabels:
      app: nfs-client-provisioner
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: nfs-client-provisioner
    spec:
      serviceAccount: nfs-provisioner
      containers:
        - name: nfs-client-provisioner
          image: quay.io/external_storage/nfs-client-provisioner:latest
          imagePullPolicy: IfNotPresent
          volumeMounts:
            - name: nfs-client
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: fuseim.pri/ifs
            - name: NFS_SERVER
              value: 10.11.99.141
            - name: NFS_PATH
              value: /data/nfs
      volumes:
        - name: nfs-client
          nfs:
            server: 10.11.99.141
            path: /data/nfs
---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs-storage
provisioner: fuseim.pri/ifs
reclaimPolicy: Retain

7、部署yaml文件

kubectl apply -f  deployment.yaml

8、查看服务

kubectl get pods
NAME                                      READY   STATUS    RESTARTS   AGE
nfs-client-provisioner-6d4469b5b5-bh6t9   1/1     Running   0          73m

9、列出你的集群中的StorageClass

kubectl get sc

NAME                    PROVISIONER      RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
nfs-storage (default)   fuseim.pri/ifs   Retain          Immediate           false                  18h

10、标记一个StorageClass为默认的（是storageclass的名字也就是你部署的StorageClass名字是啥就写啥）

kubectl patch storageclass nfs-storage -p ‘{"metadata": {"annotations":{"storageclass.kubernetes.io/is-default-class":"true"}}}‘

11、验证你选用为默认的StorageClass

kubectl get storageclass
NAME                            PROVISIONER      RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
nfs-storage (default)   fuseim.pri/ifs   Delete          Immediate           false                  77m

三、部署 KubeSphere

确保您的机器满足安装的前提条件之后，可以按照以下步骤安装 KubeSphere。

执行以下命令开始安装：

kubectl apply -f https://github.com/kubesphere/ks-installer/releases/download/v3.1.1/kubesphere-installer.yaml
   
kubectl apply -f https://github.com/kubesphere/ks-installer/releases/download/v3.1.1/cluster-configuration.yaml

2、安装　

经过一段时间的安装后，看到以下界面则表示安装成功：

Kubernetes 集群在线部署mini KubeSphere