CentOS 7 yum 源改为阿里 的

1.安装base reop源

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cd /etc/yum.repos.d

接着备份旧的配置文件

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sudo mv CentOS-Base.repo CentOS-Base.repo.bak

下载阿里源的文件

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sudo wget -O CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

2 安装epel repo源：

epel(RHEL 7)

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

epel(RHEL 6)

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wget -O /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-6.repo

epel(RHEL 5)

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wget -O /etc/yum.repos.d/epel.repo https://mirrors.aliyun.com/repo/epel-5.repo

3.清理缓存

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yum clean all

4.重新生成缓存

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yum makecache