lookup package dnsmask 

TO remove the rhel6 kernle from rhel5 server
================================================================= 
changed this in  /etc/sysconfig/rhn/up2date
    retrieveOnly[comment]=Retrieve packages only
    ###retrieveOnly=0
    retrieveOnly=1

Add this to /usr/local/bin/yum-cron-update.bash
    /bin/cp -pf /etc/yum.repos.d/public-yum-el5.repo.USEME /etc/yum.repos.d/public-yum-el5.repo; ls -l >>/var/log/yum-cron-update.log 2>&1
    echo "##################" >>/var/log/yum-cron-update.log
And confirm : 
	/usr/bin/yum --exclude='kernel-uek* oracle-linux' update -y  >>/var/log/yum-cron-update.log 2>&1


wget http://public-yum.oracle.com/public-yum-el5.repo
        change all UEK enteries to enabled=0                
	in public-yum-el5.repo-disabled
        cp public-yum-el5.repo-disabled public-yum-el5.repo.USEME 

yum.conf confirm:
	exclude=kernel-uek* oracle-linux*

yum clean all

/usr/bin/yum --exclude='kernel-uek* oracle-linux' update

yum install kernel-2.6.18-407.el5.x86_64

yum remove kernel-uek-devel.x86_64 kernel-uek-headers.x86_64 

mod /boot/grub/mneu.list to use 2.6.18-238.el5  to boot and remove the 2.6.32-100 kernel references

yum install compat-gcc* compat-glibc compat-glibc-headers glibc-devel glibc-devel glibc-headers systemtap systemtap-devel gcc gcc-c++ gcc-gfortran gcc-java 
	## Might have to yum remove systemtap-client     

/root/VMTOOLS/vmware-tools-distrib/vmware-install.pl -D

run one final:  /usr/bin/yum --exclude='kernel-uek* oracle-linux' update

reboot