开放端口

永久的开放需要的端口

sudo firewall-cmd --zone=public --add-port=3000/tcp --permanent

sudo firewall-cmd --reload

之后检查新的防火墙规则

firewall-cmd --list-all

关闭防火墙

由于只是用于开发环境，所以打算把防火墙关闭掉

//临时关闭防火墙,重启后会重新自动打开

systemctl restart firewalld

//检查防火墙状态

firewall-cmd --state

firewall-cmd --list-all

//Disable firewall

systemctl disable firewalld

systemctl stop firewalld

systemctl status firewalld

//Enable firewall

systemctl enable firewalld

systemctl start firewalld

systemctl status firewalld