1.5 Shipped Kernels

Oracle Linux 6 Update 10 ships with the following kernel packages:

  • Unbreakable Enterprise Kernel Release 4 (kernel-uek-4.1.12-124.16.4.el6uek) for x86-64

  • Unbreakable Enterprise Kernel Release 2 (kernel-uek-2.6.39-400.294.3.el6uek) for i386

  • Red Hat Compatible Kernel (kernel-2.6.32-754.el6) for i386 and x86-64

By default, both UEK and RHCK for the specific architecture (i386 or x86-64) are installed and the system boots the Unbreakable Enterprise Kernel release.

The ISO image for Oracle Linux 6 Update 10 for i386 includes the Red Hat Compatible Kernel and Unbreakable Enterprise Kernel Release 2 but not Unbreakable Enterprise Kernel Release 4, which does not support i386.

The ISO image for Oracle Linux 6 Update 10 for x86-64 includes the Red Hat Compatible Kernel and Unbreakable Enterprise Kernel Release 4 Update 7 but not Unbreakable Enterprise Kernel Release 2. You are still able to run Oracle Linux 6 Update 10 using the latest UEK R3 version.

Note that the default I/O scheduler that is used for the UEK is deadline, while cfq is the default for RHCK.

To enable your system boot the Red Hat Compatible Kernel by default:

  1. Edit the /etc/grub.conf file and change the value of the default parameter to indicate the Red Hat Compatible Kernel. Note that each entry for a bootable kernel in the file starts with a title definition. The entries are effectively numbered from 0 upwards, where 0 corresponds to the first entry in the file, 1 corresponds to the second entry, and so on. To view the GRUB man page, type the info grub command.

  2. Edit the /etc/sysconfig/kernel file and change the setting for the default kernel package type from DEFAULTKERNEL=kernel-uek to DEFAULTKERNEL=kernel.