[1] 首先备份/etc/yum.repos.d/CentOS-Base.repo
@H_403_3@[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)
[4] 运行yum makecache生成缓存
@H_403_3@[root@localhost yum.repos.d]# yum makecache
[5] 更新系统(时间比较久,主要看个人网速)
@H_403_3@[root@localhost yum.repos.d]# yum -y update
