~~~ yum -y install lsof wget net-tools vim mv /etc/yum.repos.d /etc/yum.repos.d.backup.20180408 mkdir /etc/yum.repos.d wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo yum clean all yum makecache ~~~ ~~~ systemctl stop firewalld.service #停止firewall systemctl disable firewalld.service #禁止firewall開機啟動 firewall-cmd --state #查看默認防火墻狀態（關閉后顯示notrunning，開啟后顯示running） ~~~