yum源报错问题,解决方案:推倒重建(3步搞定) 1 备份原repos.d下的文件,以备不时之须 # cd /etc/yum.repos.d # mkdir repo_backup # mv *.repo repo_backup 2 配置阿里云的镜像源 # wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo 3 清理yum缓存再生成新缓存 # yum clean all # yum makecache 4 结果