显示防火墙状态
systemctl status firewalld.service
启动/关闭防火墙
systemctl start firewalld.service
systemctl stop firewalld.service
设置开机启动/禁用
下列命令执行后，重启机器防火墙的状态才会改变
systemctl disable firewalld.service
systemctl enable firewalld.service
CentOS7防火墙相关操作
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