CentOS7 修改yum源为aliyun
1,登陆root帐号
2,cd /etc/yum.repo.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