[Error] kubectl commands error - the server is currently unable to handle the request

The server is currently unable to handle the request 오류 해결법

• kubectl 명령어를 입력하면 다음 오류 메시지가 발생하는 경우가 있습니다.

  couldn't get resource list for metrics.k8s.io/v1beta1: the server is currently unable to handle the request
  
  or
  
  Error from server (ServiceUnavailable): the server is currently unable to handle the request (get nodes.metrics.k8s.io)
  

  E0804 15:08:38.034678    2567 memcache.go:287] couldn't get resource list for metrics.k8s.io/v1beta1: the server is currently unable to handle the request
  E0804 15:08:38.386072    2567 memcache.go:121] couldn't get resource list for metrics.k8s.io/v1beta1: the server is currently unable to handle the request
  E0804 15:08:38.452142    2567 memcache.go:121] couldn't get resource list for metrics.k8s.io/v1beta1: the server is currently unable to handle the request
  E0804 15:08:38.614993    2567 memcache.go:121] couldn't get resource list for metrics.k8s.io/v1beta1: the server is currently unable to handle the request
  

이 문제는 다음 deploy 수정하면 해결

kubectl edit deploy -n kube-system metrics-server 

dnsPolicy: ClusterFirst
hostNetwork: true    << 추가
nodeSelector:
  kubernetes.io/os: linux