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