yum -y install wget

# 备份本地yum源

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_bak

# 获取阿里yum源配置文件

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

# 查看防火墙状态

systemctl status firewalld.service

# 关闭防火墙

systemctl stop firewalld.service

# 禁止防火墙开机启动

systemctl disable firewalld.service

# 修改配置文件

vi /etc/selinux/config

SELINUX=enforcing ==> SELINUX=disabled