Kubernetes 1.5 配置dashboard

配置kubernetes的dashboard相对简单。同样的，只需要从源码中获取到dashboard-controller.yaml及dashboard-service.yaml文件，稍加修改即可：

wget https://rawgit.com/kubernetes/kubernetes/master/cluster/addons/dashboard/dashboard-controller.yaml
wget https://rawgit.com/kubernetes/kubernetes/master/cluster/addons/dashboard/dashboard-service.yaml

修改dashboard-controller.yaml如下：

kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  labels:
    app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  replicas: 1
  revisionHistoryLimit: 10
  selector:
    matchLabels:
      app: kubernetes-dashboard
  template:
    metadata:
      labels:
        app: kubernetes-dashboard
      # Comment the following annotation if Dashboard must not be deployed on master
      annotations:
        scheduler.alpha.kubernetes.io/tolerations: |
          [
            {
              "key": "dedicated",
              "operator": "Equal",
              "value": "master",
              "effect": "NoSchedule"
            }
          ]
    spec:
      containers:
      - name: kubernetes-dashboard
        image: myhub.fdccloud.com/library/kubernetes-dashboard-amd64:v1.5.1
        imagePullPolicy: Always
        ports:
        - containerPort: 9090
          protocol: TCP
        args:
          # Uncomment the following line to manually specify Kubernetes API server Host
          # If not specified, Dashboard will attempt to auto discover the API server and connect
          # to it. Uncomment only if the default does not work.
　　　　 #额外增加
        - --apiserver-host=http://10.5.10.116:8080
        livenessProbe:
          httpGet:
            path: /
            port: 9090
          initialDelaySeconds: 30
          timeoutSeconds: 30

dashboard-service.yaml不需要修改，这里直接给出源码中的示例文件：

kind: Service
apiVersion: v1
metadata:
  labels:
    app: kubernetes-dashboard
  name: kubernetes-dashboard
  namespace: kube-system
spec:
  type: NodePort
  ports:
  - port: 80
    targetPort: 9090
  selector:
    app: kubernetes-dashboard

执行启动即可：

kubectl create -f dashboard-controller.yaml
kubectl create -f dashboard-service.yaml

启动后，可以通过如下指令查看映射的nodeport：

[root@server-116 kubernetes]# kubectl get svc --namespace=kube-system
NAME                   CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE
kube-dns               10.254.0.100   <none>        53/UDP,53/TCP   5h
kubernetes-dashboard   10.254.68.60   <nodes>       80:30097/TCP    1d

以下访问地址皆可用于访问：

http://10.5.10.116:8080/ui

http://10.5.10.116:30097

dashboard界面如图：

错误说明：

在实际的配置过程中，发现dashboard无法启动，通过kubectl logs 查看pod日志，如下：

Using HTTP port: 9090
Error while initializing connection to Kubernetes apiserver. This most likely means that the cluster is misconfigurhas invalid apiserver certificates or service accounts configuration) or the --apiserver-host param points to a ser not exist. Reason: invalid configuration: no configuration has been provided
Refer to the troubleshooting guide for more information: https://github.com/kubernetes/dashboard/blob/master/docs/uubleshooting.md

这个错误，就是因为需要在dashboard启动的args参数里加上如下参数：

--apiserver-host=http://10.5.10.116:8080

另外，我们发现这个dashboard的访问没有任何的认证与授权机制，后续会专门对kubernetes的认证机制做相关说明。