centos 切换阿里源
阿里云Linux安装镜像源地址:http://mirrors.aliyun.com/
第一步:备份原镜像文件
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
第二步:下载源文件CentOS-Base.repo 到/etc/yum.repos.d/
注:根据自己的版本选择不同的repo文件
CentOS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
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
http://mirrors.163.com/.help/CentOS7-Base-163.repo(163源备用)
Centos 8
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo
第三步:运行yum makecache生成缓存
yum clean all
yum makecache
第四步:等待下载完成
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