解决zookeeper集群重启 Error contacting service. It is probably not running 问题

参考：https://blog.csdn.net/qq_22211217/article/details/80639492

我的是用的这一条：

7 防火墙拦截端口

systemctl status firewalld.service

1.  systemctl stop firewalld.service #关闭防火墙
2.  systemctl disable firewalld.service #禁止启动防火墙