在对kubernetes 1.19.0 集群扩容的时候报错失败，控制台打印信息如下
[preflight] Running pre-flight checks
error execution phase preflight: couldn't validate the identity of the API Server: could not find a JWS signature in the cluster-info ConfigMap for token ID "9igmi0"
To see the stack trace of this error execute with --v=5 or higher
意思就是在执行 phase preflight的时候身份认证失败，token 签名认证不成功
解决方法：
kubeadm token create 重新获取
更换token后加入集群成功
查看节点
kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
master121 Ready <none> 5m18s v1.19.0 192.168.161.121 <none> CentOS Linux 7 (Core) 3.10.0-862.el7.x86_64 docker://1.13.1
slave122 Ready <none> 40h v1.19.0 192.168.161.122 <none> CentOS Linux 7 (Core) 3.10.0-862.el7.x86_64 docker://1.13.1
slave123 Ready master 42h v1.19.0 192.168.161.123 <none> CentOS Linux 7 (Core) 3.10.0-1127.19.1.el7.x86_64 docker://1.13.1
没问题
看下dashboard是否正常
