[root@k8s-master dashboard]# kubectl -n kubernetes-dashboard get secrets|grep kubernetes-dashboard-token
kubernetes-dashboard-token-kmcrd   kubernetes.io/service-account-token   3      34d
[root@k8s-master dashboard]# 
[root@k8s-master dashboard]# kubectl -n kubernetes-dashboard get secrets kubernetes-dashboard-token-kmcrd 
NAME                               TYPE                                  DATA   AGE
kubernetes-dashboard-token-kmcrd   kubernetes.io/service-account-token   3      34d

[root@k8s-master dashboard]# DASH_TOCKEN=$(kubectl -n kubernetes-dashboard get secrets kubernetes-dashboard-token-kmcrd  -o jsonpath={.data.token}) 
[root@k8s-master dashboard]#

[root@k8s-master dashboard]# kubectl config set-cluster kubernetes --server=172.16.4.169:6443 --kubeconfig=/root/dashbord-admin.conf
Cluster "kubernetes" set.

[root@k8s-master dashboard]# kubectl config set-credentials kubernetes-dashboard --token=$DASH_TOCKEN --kubeconfig=/root/dashbord-admin.conf 
User "kubernetes-dashboard" set.

[root@k8s-master dashboard]# kubectl config set-context kubernetes-dashboard@kubernetes --cluster=kubernetes --user=kubernetes-dashboard --kubeconfig=/root/dashbord-admin.conf 
Context "kubernetes-dashboard@kubernetes" created.

[root@k8s-master dashboard]# kubectl config use-context kubernetes-dashboard@kubernetes --kubeconfig=/root/dashbord-admin.conf 
Switched to context "kubernetes-dashboard@kubernetes".