kubeadm kubeadm init certificate-key 까먹었을때 , kubeadm init phase upload-certs --upload-certs kubeadm init phase upload-certs --upload-certs kubeadm init token 까먹었을때, kubeadm token list Hash 확인, openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //' Kubernetes API Server:PORT 확인, kubectl cluster-info kubeadm jo..