centos7关闭防火墙
查看防火墙状态：
systemctl status firewalld
running表示防火墙开启
关闭防火墙命令：
systemctl stop firewalld
开机禁用防火墙自启命令 ：
systemctl disable firewalld.service
EOF
systemctl status firewalld
running表示防火墙开启
systemctl stop firewalld
systemctl disable firewalld.service