centos7開啟防火牆和指定埠

1、開啟防火牆

firewall-cmd --state

systemctl start firewalld.service

systemctl enable firewalld.service

systemctl restart firewalld.service

firewall-cmd --state

systemctl is-enabled firewalld.service;echo $?

開端口命令：firewall-cmd --zone=public --add-port=80/tcp --permanent

重啟防火牆：systemctl restart firewalld.service
檢視開啟的所有埠:firewall-cmd --list-ports
命令含義：
--zone #作用域
--add-port=80/tcp  #新增埠，格式為：埠/通訊協議
--permanent   #永久生效，沒有此引數重啟後失效

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