kubectl get node运行时出现：Unable to connect to the server: x509: certificate signed by unknown authority

kubectl get nodes运行时出现：Unable to connect to the server: x509: certificate signed by unknown authority

原因：我们在运行kubeadm reset时，没有删除原先的$HOME/.kube文件导致新建的kubelet报错。实际上在kubeadm reset执行后，系统已经提示我们需要手动删除这个配置文件。

解决方法：在运行kubeadm reset之后，接着输入rm -rf $HOME/.kube删除原配置文件。

使用kubeadm对集群进行重新配置的完整操作：

kubeadm reset
rm -rf $HOME/.kube
kubeadm init --config=kubeadm-config.yaml --upload-certs | tee kubeadm-init.log
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

结果：再次输入kubectl get nodes，运行成功。

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kubectl get node运行时出现：Unable to connect to the server: x509: certificate signed by unknown authority

kubectl get nodes运行时出现：Unable to connect to the server: x509: certificate signed by unknown authority

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