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centos7防火牆關閉和設定

systemctl stop firewalld.service
systemctl disable firewalld.service
開始防火牆:
systemctl start firewalld.service
systemctl enable firewalld.service
檢視防火牆狀態:
systemctl status firewalld
檢視防火牆開放的埠:

firewall-cmd --zone=public --list-ports 

增加防火牆開放的埠:

firewall-cmd --zone=public --add-port=20880/tcp --permanent 

重啟防火牆:

systemctl restart firewalld.service 

再次檢視是否生效:

firewall-cmd --zone=public --list-ports