一、防火墙的开启、关闭、禁用命令

(1)设置开机启用防火墙:systemctl enable firewalld.service

(2)设置开机禁用防火墙:systemctl disable firewalld.service

(3)启动防火墙:systemctl start firewalld

(4)关闭防火墙:systemctl stop firewalld

(5)检查防火墙状态:systemctl status firewalld 

二、使用firewall-cmd配置端口

(1)查看防火墙状态:firewall-cmd –state

(2)重新加载配置:firewall-cmd –reload

(3)查看开放的端口:firewall-cmd –list-ports

(4)开启防火墙端口:firewall-cmd –zone=public –add-port=9200/tcp –permanent

  命令含义:

  –zone #作用域

  –add-port=9200/tcp #添加端口,格式为:端口/通讯协议

  –permanent #永久生效,没有此参数重启后失效

  注意:添加端口后,必须用命令firewall-cmd –reload重新加载一遍才会生效

(5)关闭防火墙端口:firewall-cmd –zone=public –remove-port=9200/tcp –permanent

参考地址https://www.cnblogs.com/marso/archive/2018/01/06/8214927.html