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Red Hat Enterprise Linux 8 Essentials Book now available.

Purchase a copy of Red Hat Enterprise Linux 8 (RHEL 8) Essentials in eBook ($24.99) or Print ($36.99) format

Red Hat Enterprise Linux 8 Essentials Print and eBook (ePub/PDF/Kindle) editions contain 31 chapters and over 250 pages

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39.2. Preparing to Upgrade

Before upgrading the kernel, it is recommended that you take some precautionary steps. The first step is to make sure working boot media exists for the system in case a problem occurs. If the boot loader is not configured properly to boot the new kernel, the system cannot be booted into Red Hat Enterprise Linux without working boot media.

To create a boot diskette, login as root, and run the command /sbin/mkbootdisk `uname -r` at a shell prompt.


Refer to the mkbootdisk man page for more options. You can create bootable media via CD-Rs, CD-RWs, and USB flash drives, provided that your system BIOS also supports it.

Reboot the machine with the boot media and verify that it works before continuing.

To determine which kernel packages are installed, execute the command rpm -qa | grep kernel at a shell prompt:

The output contains some or all of the following packages, depending on the system's architecture (the version numbers and packages may differ):


From the output, determine which packages need to be download for the kernel upgrade. For a single processor system, the only required package is the kernel package. Refer to Section 39.1, “Overview of Kernel Packages” for descriptions of the different packages.

In the file name, each kernel package contains the architecture for which the package was built. The format is kernel-<variant>-<version>.<arch>.rpm, where <variant> is one of either PAE, xen, and so forth. The <arch> is one of the following:

  • x86_64 for the AMD64 and Intel EM64T architectures

  • ia64 for the Intel® Itanium™ architecture

  • ppc64 for the IBM® eServerpSeries™ architecture

  • s390 for the IBM® S/390® architecture

  • s390x for the IBM® eServerSystem z® architecture

  • i686 for Intel® Pentium® II, Intel® Pentium® III, Intel® Pentium® 4, AMD Athlon®, and AMD Duron® systems

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