CentOS7 修改yum源为aliyun

1，登陆root帐号

2，cd /etc/yum.repos.d

3，mv CentOS-Base.repo CentOS-Base.repo.bak

4，wget http://mirrors.aliyun.com/repo/Centos-7.repo

5，mv Centos-7.repo CentOS-Base.repo

6， yum clean all

7， yum makecache

8，yum update

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

或 curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo