CentOS 7 with Oracle UEK

Author: | Posted in howto No comments

For whatever reasons, one may want to install and run Oracle’s UEK on CentOS. I tested that with a CentOS 7 VM instance and UEKR3. Everything was pretty straightforward and safe to do on a test machine, but I would certainly not recommend running this in production :)


Install the UEKR3 repo

cd /etc/yum.repos.d
wget http://public-yum.oracle.com/public-yum-ol7.repo


Disable all OL7 yum channels and enable UEK3 only

The default yum repository for OL7 enables multiple channels (like Oracle Linux updates) which we don’t need (as we run CentOS7). We have to disable all of them and only enable UEK3.

yum-config-manager --disable ol7*
yum-config-manager --enable ol7_UEKR3

At this point running yum repolist should reveal the newly installed UEK repository:

yum repolist
repo id                  repo name                                                                           status
base/7/x86_64            CentOS-7 - Base                                                                     8,465
epel/x86_64              Extra Packages for Enterprise Linux 7 - x86_64                                      7,301
extras/7/x86_64          CentOS-7 - Extras                                                                     104
ol7_UEKR3/x86_64         Latest Unbreakable Enterprise Kernel Release 3 for Oracle Linux 7 (x86_64)            131
updates/7/x86_64         CentOS-7 - Updates                                                                  1,688
repolist: 17,689


Make kernel-uek the new default

This is optional if we want the new kernel-uek to be made default. Alternatively, specific kernels can be made default at any time using grub2-set-default.

sed -i 's/DEFAULTKERNEL=kernel/DEFAULTKERNEL=kernel=uek/' /etc/sysconfig/kernel


Import the OL7 RPM GPG key

rpm --import http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol7


Install kernel-uek

yum install kernel-uek kernel-uek-devel


Confirm kernel-uek is default and reboot

grub2-editenv list
init 6


After reboot everything was fine on my VM except for a minor glitch I had with NetworkManager when running the new kernel-uek. The Ethernet interface wasn’t able to get an IPv4 address automatically so I had to manually run dhclient $ETH_NAME. Not sure what caused the issue and I didn’t pay too much attention to it since I did this for testing purposes only.

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