zookeeper虚拟机集群搭建问题：Cannot open channel to * at election address

1. 配置zoo.cfg中各个主机的ip地址不对，查看myid是否与zoo.cfg中service.*是对应的。
2. 关闭防火墙
   首先查看防火墙的状态
   1. systemctl status firewalld.service
      active(running)表示防火墙开启
      关闭防火墙
   2. systemctl stop firewalld service
   3. systemctl status firewalld.service
      disavtive（dead)表示防火墙已经关闭
      设置开机禁止防火墙服务器
   4. systemctl disable firewalld.service