Chapter 3 Installation and Availability

You can install Unbreakable Enterprise Kernel Release 3 (UEK R3) on Oracle Linux 6 Update 4 or newer, running either the Red Hat compatible kernel or a previous version of the Unbreakable Enterprise Kernel. If you are still running an older version of Oracle Linux, first update your system to the latest available update release.

UEK R3 is supported on the x86-64 architecture but not on x86.

The kernel's source code is available via a public git source code repository at

Starting with Oracle Linux 6 Update 5 for x86-64, UEK R3 is the default boot kernel for fresh installations of Oracle Linux.

For systems that are running UEK R3 and are subscribed to the ol6_x86_64_UEKR3_latest channel on ULN, or the ol6_UEKR3_latest repository in the Oracle Oracle Yum Server repository, you upgrade to the latest UEK release as follows:

  1. Upgrade all packages on the system, including kernel packages.

    # yum update

    By default, the boot manager automatically enables the most recent kernel version so you do not need to change your GRUB configuration.

  2. Reboot the system.

    # shutdown -r now

For systems that are currently running a previous version of the Unbreakable Enterprise Kernel (UEK R2) or the Red Hat compatible kernel (RHCK), you can switch to UEK R3 at any time. For details, see: