問題:老是關閉防火牆太麻煩，所以選擇徹底關閉防火牆，發現每次都記不住命令!
下面是red hat/CentOs7關閉防火牆的命令!
1:查看防火狀態
systemctl status firewalld
service iptables status
2:暫時關閉防火牆
systemctl stop firewalld
service iptables stop
3:永久關閉防火牆
systemctl disable firewalld
chkconfig iptables off
4:重啓防火牆
systemctl enable firewalld
service iptables restart
5:永久關閉後重啓
//暫時還沒有試過
chkconfig iptables on