redhat7.9更换源为centos7(阿里云源-目前centos7可用的源)具体步骤如下: 1、备份原原文件 #mkdir backup && mv /etc/yum.repos.d/*.repo /etc/yum.repos.d/backup/ 2、修改subscription-manager.conf #vi /etc/yum/pluginconf.d/subscription-manager.conf // 将 “enabled=1” 改为 “enabled=0” 3、下载源文件Centos-7.repo: # curl -o /etc/yum.repos.d/CentOS