防火牆常用命令
centos7的防火牆的狀態
sudo systemctl status firewalld
關閉防火牆
sudo systemctl stop firewalld
打開防火牆
sudo systemctl start firewalld
重啟后防火牆
sudo systemctl disable firewalld
開機啟動防火牆
systemctl enable firewalld
開機自動關閉
systemctl disable firewalld