【Kubernetes】The connection to the server <master>:6443 was refused - did you specify the right host or port?
不知道怎么用着用着，使用kubectl 时报错，错误如下：
root@R740--:~# kubectl get pod
The connection to the server 107.105.136.28: was refused - did you specify the right host or port?
$systemctl status kubelet
Mar :: server1 kubelet[]: E0307 ::25.908557 reflector.go:] k8s.io/kubernetes/pkg/kubelet/config/apiserver.go:: Failed to list *v1.Pod: Get https://107.105.136.28:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::26.718263 eviction_manager.go:] eviction manager: unexpected err: failed to get node info: node "server1" not found
Mar :: server1 kubelet[]: E0307 ::26.906939 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Service: Get https://107.105.136.28:6443/api/v1/services?limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::26.907933 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Node: Get https://107.105.136.28:6443/api/v1/nodes?fieldSelector=metadata.name%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::26.908994 reflector.go:] k8s.io/kubernetes/pkg/kubelet/config/apiserver.go:: Failed to list *v1.Pod: Get https://107.105.136.28:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::27.392766 remote_runtime.go:] RunPodSandbox from runtime service failed: rpc error: code = Unknown desc = failed pulling image "gcr.io/google_containers/pause-amd64:3.0": Error response from daemon: Get https://gcr.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded w
Mar :: server1 kubelet[]: E0307 ::27.392788 kuberuntime_sandbox.go:] CreatePodSandbox for pod "kube-apiserver-server1_kube-system(7c74aa0f4b9044a62ba3fc2b222b6a49)" failed: rpc error: code = Unknown desc = failed pulling image "gcr.io/google_containers/pause-amd64:3.0": Error response from daemon: Get https://gcr.io/v2/: net/http: request c
Mar :: server1 kubelet[]: E0307 ::27.392795 kuberuntime_manager.go:] createPodSandbox for pod "kube-apiserver-server1_kube-system(7c74aa0f4b9044a62ba3fc2b222b6a49)" failed: rpc error: code = Unknown desc = failed pulling image "gcr.io/google_containers/pause-amd64:3.0": Error response from daemon: Get https://gcr.io/v2/: net/http: request
Mar :: server1 kubelet[]: E0307 ::27.392823 pod_workers.go:] Error syncing pod 7c74aa0f4b9044a62ba3fc2b222b6a49 ("kube-apiserver-server1_kube-system(7c74aa0f4b9044a62ba3fc2b222b6a49)"), skipping: failed to "CreatePodSandbox" for "kube-apiserver-server1_kube-system(7c74aa0f4b9044a62ba3fc2b222b6a49)" with CreatePodSandboxError: "CreatePodSandbo
Mar :: server1 kubelet[]: E0307 ::27.907221 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Service: Get https://107.105.136.28:6443/api/v1/services?limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::27.908220 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Node: Get https://107.105.136.28:6443/api/v1/nodes?fieldSelector=metadata.name%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::27.909242 reflector.go:] k8s.io/kubernetes/pkg/kubelet/config/apiserver.go:: Failed to list *v1.Pod: Get https://107.105.136.28:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: I0307 ::28.239272 kubelet_node_status.go:] Setting node annotation to enable volume controller attach/detach
Mar :: server1 kubelet[]: I0307 ::28.246581 kubelet_node_status.go:] Attempting to register node server1
Mar :: server1 kubelet[]: E0307 ::28.246744 kubelet_node_status.go:] Unable to register node "server1" with API server: Post https://107.105.136.28:6443/api/v1/nodes: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::28.907491 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Service: Get https://107.105.136.28:6443/api/v1/services?limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::28.908477 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Node: Get https://107.105.136.28:6443/api/v1/nodes?fieldSelector=metadata.name%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::28.909606 reflector.go:] k8s.io/kubernetes/pkg/kubelet/config/apiserver.go:: Failed to list *v1.Pod: Get https://107.105.136.28:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::29.907804 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Service: Get https://107.105.136.28:6443/api/v1/services?limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::29.908776 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Node: Get https://107.105.136.28:6443/api/v1/nodes?fieldSelector=metadata.name%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::29.909785 reflector.go:] k8s.io/kubernetes/pkg/kubelet/config/apiserver.go:: Failed to list *v1.Pod: Get https://107.105.136.28:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::30.908131 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Service: Get https://107.105.136.28:6443/api/v1/services?limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::30.909155 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Node: Get https://107.105.136.28:6443/api/v1/nodes?fieldSelector=metadata.name%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::30.910228 reflector.go:] k8s.io/kubernetes/pkg/kubelet/config/apiserver.go:: Failed to list *v1.Pod: Get https://107.105.136.28:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::31.908495 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Service: Get https://107.105.136.28:6443/api/v1/services?limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::31.909392 reflector.go:] k8s.io/kubernetes/pkg/kubelet/kubelet.go:: Failed to list *v1.Node: Get https://107.105.136.28:6443/api/v1/nodes?fieldSelector=metadata.name%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::31.910461 reflector.go:] k8s.io/kubernetes/pkg/kubelet/config/apiserver.go:: Failed to list *v1.Pod: Get https://107.105.136.28:6443/api/v1/pods?fieldSelector=spec.nodeName%3Dserver1&limit=500&resourceVersion=0: dial tcp 107.105.136.28:6443: getsockopt: connection refused
Mar :: server1 kubelet[]: E0307 ::32.018611 event.go:] Unable to write event: 'Patch https://107.105.136.28:6443/api/v1/namespaces/default/events/server1.1519a1c427a76a94: dial tcp 107.105.136.28:6443: getsockopt: connection refused' (may retry after sleeping)
6443是Kubernetes集群APIServer的端口，因此猜测是APIServer挂掉了，因此查看正在运行的进程
$ps -aux | grep "kube"
发现果然没有有关的进程，因此重启相关的服务
$systemctl restart kube-apiserver
$systemctl restart kube-controller-manager
$systemctl restart kube-scheduler
查看状态，可以使用kubectl命令了
root@R740--:~# kubectl get componentstatus
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd- Healthy {"health":"true"}
etcd- Healthy {"health":"true"}
etcd- Healthy {"health":"true"}
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