https://velog.io/@m_o_o_n/Kubernetes-On-premise-%EC%84%A4%EC%B9%98
→ [Kubernetes Cluster 구축 - 3.Kubernetes 설치]까지 참고하여 추가 할 Worker Node Setting
kubeadm token create
openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //’
kubeadm join [ip]:6443 - -token [token 값] \ - -discovert-token-ca-cert-hash [hash값]
kubectl get nodes -o wide