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1.首先进入yum文件夹cd /etc/yum.repos.d2.删除已有的yum源rm -rf *3.下载yum源(阿里腾讯二选一)wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.cloud.tencent.com/repo/centos7_base.repo #腾讯 wget -O /etc/yum.repos.d/C...