解决方法：
查看日志 tail -f /var/log/message
发现是防火墙问题。处理方法：
关闭各个节点的防火墙:
systemctl status firewalld
systemctl stop firewalld
systemctl enable firewalld
重启node节点：
[root@k8s_node02 bin]# systemctl daemon-reload
[root@k8s_node02 bin]# systemctl restart docker
[root@k8s_node02 bin]# systemctl restart kubelet
[root@k8s_node02 bin]# systemctl restart kube-proxy
搞定：
