2020-08-20 Linux上修改yum源为阿里源（Cent

1、先安装wget，如果安装了就无需安装

yum install -y wget

2、备份原yum源

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

3、下载阿里云的CentOS-Base.repo 到/etc/yum.repos.d/

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

4、清理缓存

yum clean all

5、生成新的缓存

yum makecache

6、更新yum

yum -y update