redhat預設自帶的yum源需要註冊，才能更新，報錯：
This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
可替換為centos對應的源。 操作如下：

1、刪除redhat原有的yum

rpm -aq|grep yum|xargs rpm -e –nodeps

2、下載yum安裝檔案

3、安裝元件

rpm -ivh python-iniparse-0.3.1-2.1.el6.noarch.rpm rpm -ivh yum-metadata-parser-1.1.2-16.el6.x86_64.rpm

 下面安裝失敗了

# rpm -ivh yum-3.2.29-81.el6.centos.noarch.rpm yum-plugin-fastestmirror-1.1.30-37.el6.noarch.rpm warning: yum-3.2.29-81.el6.centos.noarch.rpm:Header V3 RSA/SHA1Signature, key ID c105b9de: NOKEY error: Failed dependencies: python-urlgrabber >= 3.9.1-10 is needed byyum-3.2.29-81.el6.centos.noarch You have new mail in/var/spool/mail/root

少python-urlgrabber 元件，下載：

# rpm -ivh python-urlgrabber-3.9.1-11.el6.noarch.rpm warning:python-urlgrabber- 3.9.1-11.el6.noarch.rpm: Header V3 RSA/SHA1 Signature, key IDc105b9de: NOKEY Preparing...               ########################################### [100%] file /usr/lib/python2.6/site-packages/urlgrabber/grabber.py from installof python-urlgrabber-3.9.1-11.el6.noarch conflicts with file from packagepython-urlgrabber-3.9.1-9.el6.noarch file /usr/lib/python2.6/site-packages/urlgrabber/grabber.pyc frominstall of python-urlgrabber-3.9.1-11.el6.noarch conflicts with file frompackage python-urlgrabber-3.9.1-9.el6.noarch file /usr/lib/python2.6/site-packages/urlgrabber/grabber.pyo frominstall of python-urlgrabber-3.9.1-11.el6.noarch conflicts with file frompackage python-urlgrabber-3.9.1-9.el6.noarch file /usr/lib/python2.6/site-packages/urlgrabber/progress.pyc frominstall of python-urlgrabber-3.9.1-