K8s: 部署 kubernetes dashboard

部署 Dashboard

K8s 官方有一个项目叫 dashboard，通过这个项目更方便监控集群的状态
官方地址: https://github.com/kubernetes/dashboard
通常我们通过命令行 $ kubectl get po -n kube-system
能够查看到集群所有的组件，但这样的方式比较不太直观
要查看集群有哪些pod，用户，命名空间等，比较麻烦
所以 K8s 提供了一个dashboard UI界面来供运维人员使用
$ wget -O kubernetes-dashboard.yaml https://raw.githubusercontent.com/kubernetes/dashboard/v2.7.0/aio/deploy/recommended.yaml
- 这是下载 kubernetes-dashboard.yaml 文件

之后，对该文件稍作修改

yaml 复制代码

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  ports:
    - port: 443
      targetPort: 8443
  selector:
    k8s-app: kubernetes-dashboard

修改成如下

yaml 复制代码

kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  type: NodePort # 加上这个
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 31111 # 加上这个，自定义
  selector:
    k8s-app: kubernetes-dashboard

$ kubectl create -f kubernetes-dashboard.yaml 部署 dashboard

conf 复制代码

namespace/kubernetes-dashboard created
serviceaccount/kubernetes-dashboard created
service/kubernetes-dashboard created
secret/kubernetes-dashboard-certs created
secret/kubernetes-dashboard-csrf created
secret/kubernetes-dashboard-key-holder created
configmap/kubernetes-dashboard-settings created
role.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
deployment.apps/kubernetes-dashboard created
service/dashboard-metrics-scraper created
deployment.apps/dashboard-metrics-scraper created

$ kubectl get svc -n kubernetes-dashboard 查看命名空间中的服务
conf 复制代码
```
NAME                        TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE
dashboard-metrics-scraper   ClusterIP   10.1.212.7     <none>        8000/TCP        27s
kubernetes-dashboard        NodePort    10.1.117.149   <none>        443:31111/TCP   27s
```
- 上面看到是 443对应的 31111 端口，所以需要用 https 来访问
- 这里 work node 配置的 hosts 有 node1.k8s 和 node2.k8s 两台，外部mac也同样配置这样的hosts，随便选择一台
- 在Mac浏览器(客户端) 上访问: https://node1.k8s:31111 它会跳转到登录页面，它会要求输入 Token

获取 token: $ kubectl -n kube-system describe $(kubectl -n kube-system get secret -n kube-system -o name | grep namespace) | grep token

conf 复制代码

Name:         namespace-controller-token-t2cl5
Type:  kubernetes.io/service-account-token
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IkhrSTdHaTdfaFgxaERORGtTODdOOHpQdlRnejJRMjJ4MWRuX2pybEZLcTQifQ.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.dF9xW6gAtEUbgRxgzCBWPLZ8IzGgyBGH46yvW5csf5dfvPLqDFldjzELDvIbG-tzAV3g539e16X9nM3TpWgoDF17M-mOToodZgqoVg9UjGz-NhNNUUSVX_IO9oZPS1ptHN_nbHUUn8W4NuUnMVS_rGjBj4PpNQfitUdwIBXcAbziESx4f2ZUpoBjnNXggCfmpFVqSeo4pSGANPohjB9d_STFPgiU_EpTflxTjq6okpjh2DX1yc16LoZGrvj2CScbHvkw5XXkfhoquqQ0Zp24bG_4wYcTVUwl9rgHhfgnFNWPMZN0yqC1FDUqjshqoBO4A8bOFAK5xhAZegZY-KxaQQ

将上述token粘贴进入，点击登录按钮，进入如下界面

可以看到里面有一个 web 的 pod, 同时，我们用命令获取 $ kubectl get po 也是同步的结果
conf 复制代码
```
NAME                   READY   STATUS    RESTARTS   AGE
web-6db77f5fdb-65wfv   1/1     Running   0          157m
```
其他命令也是一样，这个dashboard界面现在已经搭建完成了