关闭防火墙命令：systemctl stop firewalld.service
开启防火墙：systemctl start firewalld.service
关闭开机自启动：systemctl disable firewalld.service
开启开机启动：systemctl enable firewalld.service
1. 永久性生效
开启：chkconfig iptables on
关闭：chkconfig iptables off
2. 即时生效，重启后失效
开启：service iptables start
关闭：service iptables stop