CentOS7.9 Yum源更换为国内源

备份原有源

cp /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

下载国内镜像源【任选其一】

下列源任选其一，服务器未安装wget,则可以通过浏览器下载后再手工上传到指定路径

sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
sudo wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.tuna.tsinghua.edu.cn/repo/Centos-7.repo
sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo
sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.ustc.edu.cn/centos/7/os/x86_64/

清理 YUM 缓存

sudo yum clean all
sudo yum makecache

验证YUM状态

sudo yum repolist