一、查看端口开启状态
[zhujiang@localhost n2]$ sudo firewall-cmd –query-port=9998/udp
[sudo] password for zhujiang:
no
二、开启端口
[zhujiang@localhost n2]$ sudo firewall-cmd –add-port=9998/udp –permanent
success
–permanent表示永久生效，重启不会丢失配置。
三、关闭端口
[zhujiang@localhost n2]$ sudo firewall-cmd –remove-port=9998/udp –permanent
Warning: NOT_ENABLED: 9998:udp
success
重新加载配置
[zhujiang@localhost n2]$ sudo firewall-cmd –reload
success
[zhujiang@localhost n2]$
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