通过kubeadm初始化之后，都会提供node加入的token
默认的token的有效期是24小时，当过期了，如何新生成呢
[root@k8s-master ~]# kubeadm token create kk0ee6.nhvz5p85avmzyof3 [root@k8s-master ~]# kubeadm token list TOKEN TTL EXPIRES USAGES DESCRIPTION EXTRA GROUPS bgis60.aubeva3pjl9vf2qx 6h 2020-02-04T17:24:00+08:00 authentication,signing The default bootstrap token generated by ‘kubeadm init‘. system:bootstrappers:kubeadm:default-node-token kk0ee6.nhvz5p85avmzyof3 23h 2020-02-05T11:02:44+08:00 authentication,signing <none> system:bootstrappers:kubeadm:default-node-token
[root@k8s-master ~]# openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed ‘s/^.* //‘ 9db128fe4c68b0e65c19bb49226fc717e64e790d23816c5615ad6e21fbe92020
[root@k8s-node1 ~]# kubeadm join --token kk0ee6.nhvz5p85avmzyof3 --discovery-token-ca-cert-hash sha256:9db128fe4c68b0e65c19bb49226fc717e64e790d23816c5615ad6e21fbe92020 192.168.31.35:6443 [preflight] Running pre-flight checks [preflight] Reading configuration from the cluster... [preflight] FYI: You can look at this config file with ‘kubectl -n kube-system get cm kubeadm-config -oyaml‘ [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" ConfigMap in the kube-system namespace [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Activating the kubelet service [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap... This node has joined the cluster: * Certificate signing request was sent to apiserver and a response was received. * The Kubelet was informed of the new secure connection details. Run ‘kubectl get nodes‘ on the control-plane to see this node join the cluster.
原文：https://www.cnblogs.com/ricklz/p/12259110.html