想问下老师下面这结果正常吗？

[centos@master ~]$ kubectl get node
NAME     STATUS   ROLES    AGE     VERSION
master   Ready    master   6h10m   v1.19.3

[centos@master ~]$ kubectl get po -n kube-system
NAME                             READY   STATUS    RESTARTS   AGE
coredns-6d56c8448f-9j2p6         1/1     Running   0          6h9m
coredns-6d56c8448f-h4k4h         1/1     Running   0          6h9m
etcd-master                      1/1     Running   0          6h9m
kube-apiserver-master            1/1     Running   0          6h9m
kube-controller-manager-master   1/1     Running   0          6h9m
kube-flannel-ds-tzmt8            1/1     Running   0          78m
kube-proxy-94cw4                 1/1     Running   0          6h9m
kube-scheduler-master            1/1     Running   0          6h9m

为什么加上sudo就报错了?

[centos@master ~]$ sudo kubectl get node
The connection to the server localhost:8080 was refused - did you specify the right host or port?

[centos@master ~]$ sudo kubectl get po -n kube-system
The connection to the server localhost:8080 was refused - did you specify the right host or port?

我这是个run在AWS上的CentOS 7的 EC2 谢谢解答！