[1] 首先备份
/etc/yum.repos.d/CentOS-Base.repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
[2] 进入yum源配置文件所在文件夹
[root@localhost yum.repos.d]# cd /etc/yum.repos.d/
[3] 下载163的yum源配置文件，放入/etc/yum.repos.d/(操作前请做好相应备份)
[root@localhost yum.repos.d]# wget http://mirrors.163.com/.help/CentOS6-Base-163.repo
（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
CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo）
[4] 运行yum makecache生成缓存
[root@localhost yum.repos.d]# yum makecache
[5] 更新系统
[root@localhost yum.repos.d]# yum -y update
[6] 安装vim编辑器
[root@localhost ~]# yum -y install vim*
