CentOS7打開關閉防火牆

CentOS7打開關閉防火牆

1. 啓動：systemctl start firewalld
2. 關閉：systemctl stop firewalld
3. 查看狀態： systemctl status firewalld
4. 開機禁用 : systemctl disable firewalld
5. 開機啓用 ：systemctl enablefirewalld systemctl