[Kubernetes] Worker node Trouble Shooting

 

Kubernetes 클러스터 구축 후 Worker node에서 kubectl get pods --all-namespaces 실행 시 에러가 발생하였다.

 

[root@k8s-node1 ~]# kubectl get pods --all-namespaces
E0601 10:55:18.184367    7412 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp [::1]:8080: c
E0601 10:55:18.186407    7412 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp [::1]:8080: c
E0601 10:55:18.188407    7412 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp [::1]:8080: c
E0601 10:55:18.190490    7412 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp [::1]:8080: c
E0601 10:55:18.191843    7412 memcache.go:265] couldn't get current server API group list: Get "http://localhost:8080/api?timeout=32s": dial tcp [::1]:8080: c
The connection to the server localhost:8080 was refused - did you specify the right host or port?

위의 에러가 발생한 이유는 다음과 같다.

• Kubernetes Config 파일이 $HOME/.kube 디렉터리 아래에 존재하지 않을 때
• 현재 유저 정보가 Kubernetes Config 파일에 반영되지 않았을 때

 

아래 명령문으로 에러 해결

[root@k8s-node1 ~]# mkdir -p $HOME/.kube
[root@k8s-node1 ~]# cp -i /etc/kubernetes/kubelet.conf $HOME/.kube/config
[root@k8s-node1 ~]# chown $(id -u):$(id -g) $HOME/.kube/config

 

정상 작동 확인

[root@k8s-node1 ~]# kubectl get pods --all-namespaces
NAMESPACE      NAME                                 READY   STATUS    RESTARTS   AGE
kube-flannel   kube-flannel-ds-8n7x6                1/1     Running   0          6d21h
kube-flannel   kube-flannel-ds-f4n8x                1/1     Running   0          6d21h
kube-flannel   kube-flannel-ds-mjl5m                1/1     Running   0          6d21h
kube-system    coredns-5d78c9869d-gltc5             1/1     Running   0          6d21h
kube-system    coredns-5d78c9869d-js7sz             1/1     Running   0          6d21h
kube-system    etcd-k8s-master                      1/1     Running   0          6d21h
kube-system    kube-apiserver-k8s-master            1/1     Running   0          6d21h
kube-system    kube-controller-manager-k8s-master   1/1     Running   0          6d21h
kube-system    kube-proxy-hntmd                     1/1     Running   0          6d21h
kube-system    kube-proxy-nsl59                     1/1     Running   0          6d21h
kube-system    kube-proxy-xf49d                     1/1     Running   0          6d21h
kube-system    kube-scheduler-k8s-master            1/1     Running   0          6d21h
kube-system    metrics-server-5f4b65c947-j9qzg      1/1     Running   0          59m