(1)输入命令:firewall-cmd --state 查看当前防火墙状态
(2)命令:systemctl start firewalld.service 开启firewall防火墙
(3)命令:systemctl stop firewalld.service 关闭firewall防火墙
(4)命令:systemctl enable firewalld.service 设置开机自动启动firewall
(5)命令:systemctl disable firewalld.service 设置开机不自动启动firewall