firewall的基本使用
启动： systemctl start firewalld
查看状态： systemctl status firewalld
停止： systemctl disable firewalld
禁用：systemctl stop firewalld
配置firewall-cmd
查看版本： firewall-cmd --version查看帮助： firewall-cmd --help
显示状态： firewall-cmd --state
查看所有打开的端口： firewall-cmd --zone=public --list-ports
更新防火墙规则： firewall-cmd --reload
查看区域信息: firewall-cmd --get-active-zones
查看指定接口所属区域： firewall-cmd --get-zone-of-interface=eth0
拒绝所有包：firewall-cmd --panic-on
取消拒绝状态： firewall-cmd --panic-off
查看是否拒绝： firewall-cmd --query-panic
开启或者关闭一个端口
添加: firewall-cmd --zone=public --add-port=80/tcp --permanent （--permanent永久生效，没有此参数重启后失效）
重新载入: firewall-cmd --reload
查看: firewall-cmd --zone= public --query-port=80/tcp
删除: firewall-cmd --zone= public --remove-port=80/tcp --permanent
重新载入: firewall-cmd --reload
查看: firewall-cmd --zone= public --query-port=80/tcp
删除: firewall-cmd --zone= public --remove-port=80/tcp --permanent
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