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在最开始创建集群的时候我们的apiserver证书可能只加了一个IP，随着集群需要高可用稳定性，所以需要增加master的IP或者迁移master，这个时候就需要重新签发apiserver证书

将kubeadm的配置文件导出

Code Block
kubectl -n kube-system get configmap kubeadm-config -o jsonpath='{.data.ClusterConfiguration}' > kubeadm-init.yaml

...