zookeeper集群搭建问题：Cannot open channel to * at election address
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在zookeeper集群搭建过程中，启动服务时失败，查看log文件（默认在bin目录下的zookeeper.out）发现问题是：Cannot open channel to 3 at election address 主机名/ip：端口
java.net.NoRouteToHostException: No route to host。在网上查了之后发现有人说需要修改hosts文件，有人说需要将data/目录下的 zookeeper_server.pid文件删除重启。但是这些方法试过后都不管用，最后发现是防火墙没有关闭的原因。zookeeper集群中的各个机器之间需要通过配置的端口号进行通信，端口没打开显然不会启动成功。
关闭防火墙方法： sudo service iptables stop
为了防止下次系统重启时防火墙再次被打开，需要关闭自启动，关闭自启动方法：sudo chkconfig iptables off
防火墙关闭之后，重启zookeeper集群成功。
（总结不当之处，敬请指正）
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