linux防火墙设置
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
- 永久性生效，不会即时生效
开启：chkconfig iptables on
关闭：chkconfig iptables off
- 即时生效，重启后失效
开启：service iptables start
关闭：service iptables stop
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