Kubernetes - DashBoard部署

DashBoard

在kubernetes中完成的所有操作都是通過命令行工具kubectl完成的。其實，爲了提供更豐富的用戶體驗，kubernetes還開發了一個基於web的用戶界面（Dashboard）。用戶可以使用Dashboard部署容器化的應用，還可以監控應用的狀態，執行故障排查以及管理kubernetes中各種資源。

部署Dashboard

• 下載yaml，並運行Dashboard

# 下載yaml
$ wget  https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0/aio/deploy/recommended.yaml

# 修改kubernetes-dashboard的Service類型
kind: Service
apiVersion: v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kubernetes-dashboard
spec:
  type: NodePort  # 新增
  ports:
    - port: 443
      targetPort: 8443
      nodePort: 30009  # 新增
  selector:
    k8s-app: kubernetes-dashboard

# 部署
$ kubectl create -f recommended.yaml

# 查看namespace下的kubernetes-dashboard下的資源
$ kubectl get pod,svc -n kubernetes-dashboard
NAME                                            READY   STATUS    RESTARTS   AGE
pod/dashboard-metrics-scraper-c79c65bb7-zwfvw   1/1     Running   0          111s
pod/kubernetes-dashboard-56484d4c5-z95z5        1/1     Running   0          111s

NAME                               TYPE       CLUSTER-IP      EXTERNAL-IP  PORT(S)         AGE
service/dashboard-metrics-scraper  ClusterIP  10.96.89.218    <none>       8000/TCP        111s
service/kubernetes-dashboard       NodePort   10.104.178.171  <none>       443:30009/TCP   111s

• 創建訪問賬戶，獲取token

# 創建賬號
$ kubectl create serviceaccount dashboard-admin -n kubernetes-dashboard

# 授權
$ kubectl create clusterrolebinding dashboard-admin-rb --clusterrole=cluster-admin --serviceaccount=kubernetes-dashboard:dashboard-admin

# 獲取賬號token
$  kubectl describe secrets dashboard-admin-token-4zkkb -n kubernetes-dashboard
Name:         dashboard-admin-token-4zkkb
Namespace:    kubernetes-dashboard
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: dashboard-admin
              kubernetes.io/service-account.uid: 7053e38e-dc32-4b08-b29b-05c7f4d7a77e

Type:  kubernetes.io/service-account-token

Data
====
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6IkFCSDJONDA4aVBsMXBzNXQ0aTROOXJqR3BRRmRIQmZIalA0RnhYZ1ZZSlUifQ.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.OfRIt6qGaCQlRajv5Jt4AEauN_T6kLT_fKv8PcAuVySSP8ZZLPPzYBhA8xdIiIMzM6TulzH_l1ujSBwSwN-3475WJCQM1Ugai4_krqSiipmbvWMvUUsFex7kdx2TDDDlSE1uNeecXJvbjC8iVbbM7iB01vRZ-USWZcgp2XxdhbRcZ-KihnwcUSHXwliM4ZpcbP643B1l9--gx8XA7pdK4nTeqhBTV5xMg7b8ddGg4KE92OtBpAWr48eXURRcYz0Z7f-vheViYyNJU2nEXR5BnGLgJYfbvPW-alY-Stfidxk2hdcLMiYWZglXvg4dsVKTmt_oUDcdYTq5ODm0DbkDtg
ca.crt:     1025 bytes
namespace:  20 bytes

• 通過瀏覽器訪問Dashboard的UI

使用DashBoard

以Deployment爲例演示DashBoard的使用

查看

選擇指定的命名空間dev，然後點擊Deployments，查看dev空間下的所有deployment

擴縮容

在Deployment上點擊規模，然後指定目標副本數量，點擊確定

編輯

在Deployment上點擊編輯，然後修改yaml文件，點擊確定

查看Pod

點擊Pods, 查看pods列表

操作Pod

選中某個Pod，可以對其執行日誌（logs）、進入執行（exec）、編輯、刪除操作

Dashboard提供了kubectl的絕大部分功能