kvm虚拟机redhat安装oracle之更改rhel6 yum为centos yum

为RHEL6配置软件源：

由于 redhat的yum在线更新是收费的，如果没有注册的话不能使用，如果要使用，需将redhat的yum卸载后，再1.配置其他源：

1.删除RHEL的yum

rpm -aq | grep yum | xargs rpm -e --nodeps

2.下载CentOS的yum及其依赖的插件

wget http://mirrors.163.com/centos/6/os/i386/Packages/yum-3.2.29-30.el6.centos.noarch.rpm

wget http://mirrors.163.com/centos/6/os/i386/Packages/yum-metadata-parser-1.1.2-16.el6.i686.rpm

wget http://mirrors.163.com/centos/6/os/i386/Packages/yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm

wget http://mirrors.163.com/centos/6/os/i386/Packages/python-iniparse-0.3.1-2.1.el6.noarch.rpm

以上是32位的，64位的可到下面的网站自己查找：

http://mirrors.163.com/centos/6/os/

3. 下载并导入KEY

# cd /etc/pki/rpm-gpg/
# wget http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-6
# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY*

4.安装新的yum：

 rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm

其他包存在依赖关系，一起安装比较靠谱

 rpm -ivh yum-plugin-fastestmirror-1.1.30-14.el6.noarch.rpm yum-3.2.29-30.el6.centos.noarch.rpm

yum-metadata-parser-1.1.2-16.el6.i686.rpm

5. yum clean

6.配置yum源，去以下地址下载centos-base.repo

https://lug.ustc.edu.cn/wiki/_export/code/mirrors/help/centos?codeblock=2,

把CentOS-Base.repo里的$releasever改为6

mv centos-base.repo /etc/yum.repos.d

yum clean

ok!