将centos_yum源更换为阿里云（官方文档）

http://mirrors.aliyun.com/help/centos?spm=5176.bbsr150321.0.0.d6ykiD

1、备份

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

2、下载新的CentOS-Base.repo 到/etc/yum.repos.d/

 CentOS 5

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

CentOS 6

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

 -O --output-document=FILE下载文件保存为别的文件名

CentOS 7

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

3、之后运行yum makecache生成缓存

相关链接

• 官方主页: http://www.centos.org/
• 邮件列表: http://www.centos.org/modules/tinycontent/index.php?id=16
• 论坛: http://www.centos.org/modules/newbb/
• 文档: http://www.centos.org/docs/
• Wiki: http://wiki.centos.org/