Cento开放服务器端口

1.查看防火墙状态

systemctl status firewalld.service   // 查看
systemctl start firewalld   // 开启
systemctl stop firewalld  // 关闭

2.查看端口情况

firewall-cmd --list-all 

3.打开端口

firewall-cmd  --add-port=80/tcp --permanent

4.重启防火墙

sudo firewall-cmd --reload