1.首先进入/etc/yum.repos.d/目录下，新建一个repo_bak目录，用于保存系统中原来的repo文件
[root@node01 ~]# cd /etc/yum.repos.d/ [root@node01 yum.repos.d]# yum -y install wget [root@node01 yum.repos.d]# mkdir repo_bak [root@node01 yum.repos.d]# mv *.repo repo_bak/
2.在CentOS中配置使用网易和阿里的开源镜像
到网易和阿里开源镜像站点下载系统对应版本的repo文件
[root@node01 yum.repos.d]# wget http://mirrors.aliyun.com/repo/Centos-7.repo [root@node01 yum.repos.d]# wget http://mirrors.163.com/.help/CentOS7-Base-163.repo [root@node01 yum.repos.d]# ls CentOS7-Base-163.repo Centos-7.repo repo_bak [root@node01 yum.repos.d]# yum clean all [root@node01 yum.repos.d]# yum makecache
查看系统可用的yum源和所有的yum源
[root@node01 yum.repos.d]# yum repolist enabled 已加载插件：fastestmirror Repository base is listed more than once in the configuration Repository updates is listed more than once in the configuration Repository extras is listed more than once in the configuration Repository centosplus is listed more than once in the configuration Loading mirror speeds from cached hostfile 源标识 源名称 状态 base/7/x86_64 CentOS-7 - Base - 163.com 10,097 extras/7/x86_64 CentOS-7 - Extras - 163.com 323 updates/7/x86_64 CentOS-7 - Updates - 163.com 1,117 repolist: 11,537