更换yum源地址

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cd /etc/yum.repos.d/ mv CentOS-Base.repo CentOS-Base.repo.backup   mv CentOS-Base.repo CentOS-Base.repo.back 下载163的镜像源 wget http://mirrors.163.com/.help/CentOS7-Base-163.repo mv CentOS-Base.repo.back CentOS-Base.repo   mv CentOS-Base.repo CentOS-Base.repo.back mv CentOS7-Base-163.repo CentOS-Base.repo

　　

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1 2	下载阿里yum配置到该目录中，选择对应版本 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos7.repo

　　

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重建缓存 yum clean all yum makecache 看一下yum仓库有多少包 yum repolist