TL;DR: kubeadm init 時に生成されたトークンが期限きれてしまった時、kubeadm token create で再生成できる、がそれだけだと csr リクエスト通らなくて、実は kubeadm token create --groups 'system:bootstrappers:kubeadm:default-node-token' が必要。
あとでちゃんと書く
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