安装k8s出现 Failed to list *api.Node: Get http://192.168.144.131:8080...: dial tcp 192.168.144.131:8080:

缘由是master主机的防火墙没关，致使没法访问主机的8080端口，解决方法暂时关闭主机上的防火墙。

 * centos6 : service iptables stop

 * centos7 : systemctl stop firewalld