[root]# kubectl  top node
Error from server (NotFound): the server could not find the requested resource (get services http:heapster:)

解决办法：

git clone https://github.com/kodekloudhub/kubernetes-metrics-server.git
kubectl create -f kubernetes-metrics-server/

解决后：

[root@openc3-srv-docker kubernetes-metrics-server]# kubectl top node
NAME                    CPU(cores)   CPU%   MEMORY(bytes)   MEMORY%   
localhost.localdomain   83m          2%     2081Mi          26%       
[root@openc3-srv-docker kubernetes-metrics-server]# kubectl top pod -A
NAMESPACE              NAME                                            CPU(cores)   MEMORY(bytes)   
fengtest               nginx-6b565b9848-cswp5                          0m           5Mi             
fengtest               nginx-6b565b9848-mhbd5                          0m           5Mi             
kube-system            coredns-7ff77c879f-lvgkr                        2m           14Mi            
kube-system            coredns-7ff77c879f-ng4th                        2m           14Mi            
kube-system            etcd-localhost.localdomain                      11m          368Mi           
kube-system            kube-apiserver-localhost.localdomain            20m          311Mi           
kube-system            kube-controller-manager-localhost.localdomain   7m           47Mi            
kube-system            kube-flannel-ds-amd64-n4lx6                     2m           16Mi            
kube-system            kube-proxy-bvh5j                                1m           18Mi            
kube-system            kube-scheduler-localhost.localdomain            2m           21Mi            
kube-system            metrics-server-5b7698966-5x9xp                  1m           16Mi            
kubernetes-dashboard   dashboard-metrics-scraper-6b4884c9d5-s8l4s      1m           12Mi            
kubernetes-dashboard   kubernetes-dashboard-5d8f5b7db6-7sdzd           1m           20Mi