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95
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回答

1、先备份CentOS-Base.repo文件

2.下载新的CentOS-Base.repo 到/etc/yum.repos.d/

CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo


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