CentOS 8 修改安装源

备份默认源：

# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
# mv /etc/yum.repos.d/CentOS-AppStream.repo /etc/yum.repos.d/CentOS-AppStream.repo.backup
# mv /etc/yum.repos.d/CentOS-Extras.repo /etc/yum.repos.d/CentOS-Extras.repo.backup
# mv /etc/yum.repos.d/CentOS-PowerTools.repo /etc/yum.repos.d/CentOS-PowerTools.repo.backup
# mv /etc/yum.repos.d/CentOS-centosplus.repo /etc/yum.repos.d/CentOS-centosplus.repo.backup

添加阿里源：

# curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-8.repo
# sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo

更新缓存并安装常用工具：

# yum clean all
# yum makecache
# yum -y install bash-completion redhat-lsb net-tools vim-enhanced wget tree rsync

添加EPEL源：

# yum install epel-release
# sed -i 's|^#baseurl=https://download.fedoraproject.org/pub|baseurl=https://mirrors.aliyun.com|' /etc/yum.repos.d/epel*
或：
# sed -i 's|^#baseurl=https://download.example/pub|baseurl=https://mirrors.aliyun.com|' /etc/yum.repos.d/epel*
# sed -i 's|^metalink|#metalink|' /etc/yum.repos.d/epel*