CentOS 6 更改 yum 源和 epel 源到阿里云

1.备份原来的yum源

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

2.设置yum源为阿里云

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

3.添加epel源

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

4.清理缓存并生成新的缓存

yum clean all 
yum makecache

综合命令：

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
wget http://mirrors.aliyun.com/repo/Centos-6.repo -O /etc/yum.repos.d/CentOS-Base.repo
yum clean all 
yum makecache
yum install epel-release
wget http://mirrors.aliyun.com/repo/epel-6.repo -O /etc/yum.repos.d/epel.repo
yum clean all 
yum makecache