centos7 yum配置阿里源
1、su root
2、cd /etc/yum.repos.d/
3、如果有wget
输入:wget http://mirrors.aliyun.com/repo/Centos-7.repo
如果没有
输入:yum -y install wget
再:wget http://mirrors.aliyun.com/repo/Centos-7.repo
4、mv CentOS-Base.repo CentOS-Base.repo.bk
5、mv Centos-7.repo CentOS-Base.repo
6、yum clean all
7、yum makecache
8、yum -y update
参考文档:https://blog.youkuaiyun.com/ltx06/article/details/78030056