Have enough courage to start and enough heart to finish.

1 备份原文件

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

2 下载阿里base基础源

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

3 更新base基础缓存

yum clean all

yum makecache

yum -y update

4 下载阿里epel拓展源

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

5 更新epel拓展缓存

yum clean all # 清除系统所有的yum缓存 yum makecache # 生成yum缓存 yum -y update