查看状态 systemctl status firewalld
安装防火墙 yum install firewalld
开启服务 systemctl start firewalld.service
开机自动启动 systemctl enable firewalld.service
关闭防火墙 systemctl stop firewalld.service
关闭开机制动启动 systemctl disable firewalld.service
修改yum加速插件: vi /etc/yum/pluginconf.d/fastestmirror.conf enable=0
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