CentOS7系统更换yum Repo源

备份原镜像

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

下载阿里云的Base源和EPEL源

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/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

或者 下载腾讯云的Base源和EPEL源

sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo
sudo wget -O /etc/yum.repos.d/epel.repo http://mirrors.cloud.tencent.com/repo/epel-7.repo

或者 下载163的Base源

sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo

清理和生成缓存

sudo yum clean all
sudo yum makecache