systemctl start firewalld
systemctl status firewalld
systemctl stop firewalld
firewall-cmd --permanent --zone=public --add-port=80/tcp

firewall-cmd --list-ports  

#重启firewall  
firewall-cmd --reload  
#停止firewall  
systemctl stop firewalld.service  
#禁止firewall开机启动  
systemctl disable firewalld.service 


2、安装iptables防火墙
yum install iptables-services -y
3.启动设置防火墙
# systemctl enable iptables
# systemctl start iptables
 
4.查看防火墙状态
systemctl status iptables

systemctl restart iptables.service #重启防火墙使配置生效
systemctl enable iptables.service #设置防火墙开机启动