帮助中心 centos 更换安装源 CentOS系统更换软件安装源中国大陆以外地区请使用 163源第一步:备份你的原镜像文件,以免出错后可以恢复。mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup第二步:下载新的CentOS-Base.repo 到/etc/yum.repos.d/CentOS 5阿里源 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo163源 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS5-Base-163.repoCentOS 6阿里源wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo163源 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS6-Base-163.repocentos 7阿里源wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo163源 wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo第三步:运行yum makecache生成缓存yum clean allyum makecache