centos7关闭防火墙
查看防火墙状态：firewall-cmd --state
停止firewall：systemctl stop firewalld.service
禁止firewall开机启动：systemctl disable firewalld.service
查看防火墙状态：firewall-cmd --state
停止firewall：systemctl stop firewalld.service
禁止firewall开机启动：systemctl disable firewalld.service