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由于CentoS7.9系统源停止更新,无法使用yum很多命令,一键更换阿里源的代码如下: mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup && curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo && yum makecache && yum clean all && yum makecache && yum -y update && yum -y upgrade