centOs防火牆關閉，及埠的開放

檢視 firewalld 狀態

systemctl status firewalld

systemctl start firewalld

systemctl stop firewalld

開機禁用  ： systemctl disable firewalld

開機啟用 ： systemctl enable firewalld

// --permanent 永久生效,沒有此引數重啟後失效

firewall-cmd --zone=public --add-port=80/tcp --permanent

firewall-cmd --reload

firewall-cmd --zone=public --query-port=80/tcp

firewall-cmd --zone=public --remove-port=80/tcp --permanent

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