原因是master主机的防火墙没关，导致无法访问主机的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
安装k8s出现 Failed to list *api.Node: Get http://192.168.144.131:8080…: dial tcp 192.168.144.131:8080: getsockopt: no route to
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