關閉防火牆命令：systemctl stop firewalld.service
開啟防火牆：systemctl start firewalld.service
關閉開機自啟動：systemctl disable firewalld.service
開啟開機啟動：systemctl enable firewalld.service
1. 永久性生效
開啟：chkconfig iptables on
關閉：chkconfig iptables off
2. 即時生效，重啟后失效
開啟：service iptables start
關閉：service iptables stop