將 RHEL 5.4 升級為 CentOS 5.5

因為 RHEL 5.4 trial 到期不能 yum，一些安全 BUG 看著不能升級真的感到很疼。於是試著將 RHEL 5.4 轉換為 CentOS 5。首先用 root 登錄

yum clean all
mkdir ~/centos
cd ~/centos/
wget http://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-5
wget http://mirror.centos.org/centos/5.5/os/i386/CentOS/centos-release-5-5.el5.centos.i386.rpm
wget http://mirror.centos.org/centos/5.5/os/i386/CentOS/centos-release-notes-5.5-0.i386.rpm
wget http://mirror.centos.org/centos/5.5/os/i386/CentOS/yum-3.2.22-26.el5.centos.noarch.rpm
wget http://mirror.centos.org/centos/5.5/os/i386/CentOS/yum-fastestmirror-1.1.16-14.el5.centos.1.noarch.rpm
wget http://mirror.centos.org/centos/5.5/os/i386/CentOS/yum-updatesd-0.9-2.el5.noarch.rpm
rpm --import RPM-GPG-KEY-CentOS-5
rpm -e --nodeps RedHat-release
rpm -e --nodeps yum-rhn-plugin
rpm -Uvh --force *.rpm
yum clean all
rpm --rebuilddb
yum update

重啟一下，應該就是 CentOS 5.5 咯。