1、下载新源及将本地源备份

[root@localhost ~]# cd /etc/yum.repos.d/

[root@localhost ~]# wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

[root@localhost ~]# mv CentOS-Base.repo CentOS-Base.repo.bak

[root@localhost ~]# mv CentOS6-Base-163.repo CentOS-Base.repo

2、yum源更新

[root@localhost ~]# yum clean all && yum makecache && yum update -y

3、完成