redhat的yum在線更新是收費的，未注冊則不能使用，解決辦法是更換為centos的yum，以下為詳細過程：

1.卸載redhat原有的yum

rpm -e `rpm -qa |grep yum ` --nodeps

2.到網易163鏡像源下載centos的yum安裝包

wget http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-3.2.29-60.el6.centos.noarch.rpm

wget

http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-metadata-parser-1.1.2-16.el6.x86_64.rpm

wget

http://mirrors.163.com/centos/6/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.30-30.el6.noarch.rpm

3.安裝CentOS yum

rpm -ivh yum*

4.更新repo文件

備份原先的repo文件，

wget http://mirrors.163.com/.help/CentOS6-Base-163.repo

mv http://mirrors.163.com/.help/CentOS6-Base-163.repo CentOS-Base.repo

5.yum makecache的時候報錯，需要下載安裝Centos的release和indexhtml包

wget http://mirrors.163.com/centos/6/os/x86_64/Packages/centos-indexhtml-6-2.el6.centos.noarch.rpm

wget http://mirrors.163.com/centos/6/os/x86_64/Packages/centos-release-6-6.el6.centos.12.2.x86_64.rpm

安裝上面兩個rpm包即可。

5、yum clean all ; yum cakecache

6、yum install vnc*

轉自cl340266909?的BLOG

原文：http://cl340266909.blog.51cto.com/2881514/1597514