当node节点kubectl 命令无法连接到 Kubernetes API 服务器

1.问题

当node节点当node节点kubectl 命令无法连接到 Kubernetes API 服务器

[root@node1 ~]# kubectl  get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?

2. 确认 kubeconfig 文件

确保节点上有有效的 kubeconfig 文件，并且 Kubernetes API 服务器的地址正确。你可以将 Master 节点上的 kubeconfig 文件复制到节点上：

scp /etc/kubernetes/admin.conf user@node2:/etc/kubernetes/admin.conf

3. 在节点上设置 KUBECONFIG 环境变量：

export KUBECONFIG=/etc/kubernetes/admin.conf

4. 重启kubelet服务

[root@node1 ~]# systemctl restart  kubelet.service 
[root@node1 ~]# systemctl status kubelet
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since Fri 2024-08-09 02:17:33 EDT; 1s ago
     Docs: https://kubernetes.io/docs/
 Main PID: 2519656 (kubelet)
    Tasks: 23 (limit: 10654)
   Memory: 67.2M
   CGroup: /system.slice/kubelet.service
           └─2519656 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --config=/var/lib/kubelet/config.yaml --network-plugin=cni --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.6

8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988241 2519656 reconciler.go:221] "operationExecutor.VerifyControllerAttachedVolume started for volume \"xtables-lock\" (UniqueName: \"kubernetes.io/host-path/36c16f24-07e9-45b0-96af-e44a9b30d3c5-xtables-lock\") pod \"kube-flannel-ds-7qlgm\" (UID: \"36c16f24-0>
8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988295 2519656 reconciler.go:221] "operationExecutor.VerifyControllerAttachedVolume started for volume \"kube-api-access-7bjrd\" (UniqueName: \"kubernetes.io/projected/36c16f24-07e9-45b0-96af-e44a9b30d3c5-kube-api-access-7bjrd\") pod \"kube-flannel-ds-7qlgm\" >
8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988337 2519656 reconciler.go:221] "operationExecutor.VerifyControllerAttachedVolume started for volume \"kube-proxy\" (UniqueName: \"kubernetes.io/configmap/0933f367-d6ca-498f-9d3e-48cdeb29845f-kube-proxy\") pod \"kube-proxy-44mr4\" (UID: \"0933f367-d6ca-498f->
8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988384 2519656 reconciler.go:221] "operationExecutor.VerifyControllerAttachedVolume started for volume \"xtables-lock\" (UniqueName: \"kubernetes.io/host-path/0933f367-d6ca-498f-9d3e-48cdeb29845f-xtables-lock\") pod \"kube-proxy-44mr4\" (UID: \"0933f367-d6ca-4>
8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988425 2519656 reconciler.go:221] "operationExecutor.VerifyControllerAttachedVolume started for volume \"lib-modules\" (UniqueName: \"kubernetes.io/host-path/0933f367-d6ca-498f-9d3e-48cdeb29845f-lib-modules\") pod \"kube-proxy-44mr4\" (UID: \"0933f367-d6ca-498>
8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988457 2519656 reconciler.go:221] "operationExecutor.VerifyControllerAttachedVolume started for volume \"run\" (UniqueName: \"kubernetes.io/host-path/36c16f24-07e9-45b0-96af-e44a9b30d3c5-run\") pod \"kube-flannel-ds-7qlgm\" (UID: \"36c16f24-07e9-45b0-96af-e44a>
8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988496 2519656 reconciler.go:221] "operationExecutor.VerifyControllerAttachedVolume started for volume \"cni\" (UniqueName: \"kubernetes.io/host-path/36c16f24-07e9-45b0-96af-e44a9b30d3c5-cni\") pod \"kube-flannel-ds-7qlgm\" (UID: \"36c16f24-07e9-45b0-96af-e44a>
8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988539 2519656 reconciler.go:221] "operationExecutor.VerifyControllerAttachedVolume started for volume \"kube-api-access-hnfqb\" (UniqueName: \"kubernetes.io/projected/0933f367-d6ca-498f-9d3e-48cdeb29845f-kube-api-access-hnfqb\") pod \"kube-proxy-44mr4\" (UID:>
8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988579 2519656 reconciler.go:221] "operationExecutor.VerifyControllerAttachedVolume started for volume \"cni-plugin\" (UniqueName: \"kubernetes.io/host-path/36c16f24-07e9-45b0-96af-e44a9b30d3c5-cni-plugin\") pod \"kube-flannel-ds-7qlgm\" (UID: \"36c16f24-07e9->
8月 09 02:17:34 node1 kubelet[2519656]: I0809 02:17:34.988604 2519656 reconciler.go:157] "Reconciler: start to sync state"

[root@node1 ~]# kubectl  get nodes
NAME      STATUS   ROLES                  AGE     VERSION
master    Ready    control-plane,master   3h36m   v1.23.12
master2   Ready    control-plane,master   3h34m   v1.23.12
master3   Ready    control-plane,master   3h27m   v1.23.12
node1     Ready    <none>                 3h14m   v1.23.12
node2     Ready    <none>                 3h15m   v1.23.12
[root@node1 ~]#