Learn how to upgrade Linux kernel in CentOS 8 to improve system performance, security, and hardware compatibility. Follow our step-by-step guide to install the latest stable kernel version safely. #centlinux #linux #linuxkernel
Table of Contents
What is Linux Kernel?
Kernel is the most important component of any Linux operating system. A Linux kernel is works as the interpreter or mediator between computer hardware and software processes.
The Linux Kernel performs following tasks.
- Process Management
- Memory Management
- Device Drivers
- System Calls and Security
Each Linux distribution is shipped with a stable version of Linux Kernel and the supported software and drivers. But the shipped Kernel may not be the the latest one.
One needs to upgrade the whole operating system to move to another major version of Linux Kernel.
But there are some methods by using them, you can upgrade your operating system to latest Linux kernel.
The Kernel source is provided by the The Linux Kernel Archives. Based on the available source code two editions of Linux has been compiled and distributed through ELRepo yum repository.
kernel-lt is compiled by using the source code in “longterm” branch, whereas kernel-ml is compiled by using the source code in “mainline” branch.
Read Also: Install Mainline Linux Kernel 6.0 on Rocky Linux 9
Recommended Training: The Linux Command Line Bootcamp: Beginner To Power User from Colt Steele
Linux Server Specification
We are using a minimal CentOS 8 KVM machine with following specification.
- CPU – 3.4 Ghz (2 cores)
- Memory – 2 GB
- Storage – 20 GB
- Operating System – CentOS 8.2
- Hostname – centos-8.centlinux.com
- IP Address – 192.168.116.206 /24
Apple 2024 MacBook Air 15-inch Laptop with M3 chip: Built for Apple Intelligence, 15.3-inch Liquid Retina Display, 16GB Unified Memory, 256GB SSD Storage, Backlit Keyboard, Touch ID; Starlight
$1,149.00 (as of February 21, 2025 15:19 GMT +00:00 – More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Update Linux Software Packages
Connect with centos-8.centlinux.com server as root user by using a SSH tool.
Upgrade existing software packages in CentOS 8 machine by using the dnf command.
# dnf update -y
Last metadata expiration check: 0:02:03 ago on Sun 05 Jul 2020 12:20:54 AM PKT.
Dependencies resolved.
=============================================================================
Package Arch Version Repo Size
=============================================================================
Upgrading:
gnutls x86_64 3.6.8-11.el8_2 BaseOS 915 k
libnghttp2 x86_64 1.33.0-3.el8_2.1 BaseOS 77 k
microcode_ctl x86_64 4:20191115-4.20200609.1.el8_2 BaseOS 2.7 M
Transaction Summary
=============================================================================
Upgrade 3 Packages
Total download size: 3.7 M
Downloading Packages:
(1/3): libnghttp2-1.33.0-3.el8_2.1.x86_64.rp 55 kB/s | 77 kB 00:01
(2/3): gnutls-3.6.8-11.el8_2.x86_64.rpm 96 kB/s | 915 kB 00:09
(3/3): microcode_ctl-20191115-4.20200609.1.e 204 kB/s | 2.7 MB 00:13
-----------------------------------------------------------------------------
Total 230 kB/s | 3.7 MB 00:16
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Running scriptlet: microcode_ctl-4:20191115-4.20200609.1.el8_2.x86_6 1/1
Upgrading : microcode_ctl-4:20191115-4.20200609.1.el8_2.x86_6 1/6
Running scriptlet: microcode_ctl-4:20191115-4.20200609.1.el8_2.x86_6 1/6
Upgrading : libnghttp2-1.33.0-3.el8_2.1.x86_64 2/6
Upgrading : gnutls-3.6.8-11.el8_2.x86_64 3/6
Running scriptlet: microcode_ctl-4:20191115-4.20200602.2.el8_2.x86_6 4/6
Cleanup : microcode_ctl-4:20191115-4.20200602.2.el8_2.x86_6 4/6
Running scriptlet: microcode_ctl-4:20191115-4.20200602.2.el8_2.x86_6 4/6
Cleanup : libnghttp2-1.33.0-1.el8_0.1.x86_64 5/6
Cleanup : gnutls-3.6.8-10.el8_2.x86_64 6/6
Running scriptlet: microcode_ctl-4:20191115-4.20200609.1.el8_2.x86_6 6/6
Running scriptlet: gnutls-3.6.8-10.el8_2.x86_64 6/6
Verifying : gnutls-3.6.8-11.el8_2.x86_64 1/6
Verifying : gnutls-3.6.8-10.el8_2.x86_64 2/6
Verifying : libnghttp2-1.33.0-3.el8_2.1.x86_64 3/6
Verifying : libnghttp2-1.33.0-1.el8_0.1.x86_64 4/6
Verifying : microcode_ctl-4:20191115-4.20200609.1.el8_2.x86_6 5/6
Verifying : microcode_ctl-4:20191115-4.20200602.2.el8_2.x86_6 6/6
Upgraded:
gnutls-3.6.8-11.el8_2.x86_64
libnghttp2-1.33.0-3.el8_2.1.x86_64
microcode_ctl-4:20191115-4.20200609.1.el8_2.x86_64
Complete!Verify the Kernel version of CentOS 8 operating system.
# uname -r
4.18.0-193.6.3.el8_2.x86_64Install ELRepo Yum Repository
The latest Linux kernels are available through ELRepo yum repository. Therefore, we are installing the ELRepo repository using following dnf command.
# dnf install -y https://www.elrepo.org/elrepo-release-8.el8.elrepo.noarch.rpm
Last metadata expiration check: 0:02:29 ago on Sun 05 Jul 2020 12:28:31 AM PKT.
elrepo-release-8.el8.elrepo.noarch.rpm 10 kB/s | 13 kB 00:01
Dependencies resolved.
=============================================================================
Package Arch Version Repository Size
=============================================================================
Installing:
elrepo-release noarch 8.2-1.el8.elrepo @commandline 13 k
Transaction Summary
=============================================================================
Install 1 Package
Total size: 13 k
Installed size: 5.0 k
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : elrepo-release-8.2-1.el8.elrepo.noarch 1/1
Verifying : elrepo-release-8.2-1.el8.elrepo.noarch 1/1
Installed:
elrepo-release-8.2-1.el8.elrepo.noarch
Complete!Import the GPG Key of ELRepo repository into the system.
# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.orgBuild cache for newly installed yum repositories.
# dnf makecache
CentOS-8 - AppStream 5.6 kB/s | 4.3 kB 00:00
CentOS-8 - Base 10 kB/s | 3.9 kB 00:00
CentOS-8 - Extras 785 B/s | 1.5 kB 00:01
ELRepo.org Community Enterprise Linux Reposi 2.9 kB/s | 2.9 kB 00:01
Metadata cache created.
Razer Viper V3 Pro Wireless Esports Gaming Mouse: Symmetrical – 54g Lightweight – 8K Polling – 35K Optical Sensor – Gen3 Optical Switches – 8 Programmable Controls – 95 Hr Battery – Sentinels Edition
$179.99 (as of February 21, 2025 15:19 GMT +00:00 – More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Install Latest Linux Kernel in CentOS 8
ELRepo repository contains elrepo-kernel channel that provides the Long Term Supported kernels (kernel-lt) and Main-Line Stable Kernels (kernel-ml) for Red Hat Enterprise Linux based distributions. Both of these Kernel packages are built from the sources available from The Linux Kernel Archives.
Currently, there isn’t any Long Term Supported kernel is available in this channel. But the Main-Line kernel based on latest stable release of Linux Kernel 5.7 is available.
Search the elrepo-kernel channel to list down the kernel-ml related packages.
# dnf --disablerepo="*" --enablerepo="elrepo-kernel" list available | grep kernel-ml
kernel-ml.x86_64 5.7.7-1.el8.elrepo elrepo-kernel
kernel-ml-core.x86_64 5.7.7-1.el8.elrepo elrepo-kernel
kernel-ml-devel.x86_64 5.7.7-1.el8.elrepo elrepo-kernel
kernel-ml-doc.noarch 5.7.7-1.el8.elrepo elrepo-kernel
kernel-ml-headers.x86_64 5.7.7-1.el8.elrepo elrepo-kernel
kernel-ml-modules.x86_64 5.7.7-1.el8.elrepo elrepo-kernel
kernel-ml-modules-extra.x86_64 5.7.7-1.el8.elrepo elrepo-kernel
kernel-ml-tools.x86_64 5.7.7-1.el8.elrepo elrepo-kernel
kernel-ml-tools-libs.x86_64 5.7.7-1.el8.elrepo elrepo-kernel
kernel-ml-tools-libs-devel.x86_64 5.7.7-1.el8.elrepo elrepo-kernelInstall the kernel-ml package by using the following command. You can also install any other kernel-ml-* package according to your requirement.
# dnf --enablerepo="elrepo-kernel" install -y kernel-ml
Last metadata expiration check: 0:05:46 ago on Sun 05 Jul 2020 12:33:14 AM PKT.
Dependencies resolved.
================================================================================
Package Arch Version Repository Size
================================================================================
Installing:
kernel-ml x86_64 5.7.7-1.el8.elrepo elrepo-kernel 32 k
Installing dependencies:
kernel-ml-core x86_64 5.7.7-1.el8.elrepo elrepo-kernel 28 M
kernel-ml-modules x86_64 5.7.7-1.el8.elrepo elrepo-kernel 23 M
Transaction Summary
================================================================================
Install 3 Packages
Total download size: 51 M
Installed size: 87 M
Downloading Packages:
(1/3): kernel-ml-5.7.7-1.el8.elrepo.x86_64.rpm 51 kB/s | 32 kB 00:00
(2/3): kernel-ml-modules-5.7.7-1.el8.elrepo.x86 115 kB/s | 23 MB 03:24
(3/3): kernel-ml-core-5.7.7-1.el8.elrepo.x86_64 109 kB/s | 28 MB 04:25
--------------------------------------------------------------------------------
Total 196 kB/s | 51 MB 04:28
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : kernel-ml-core-5.7.7-1.el8.elrepo.x86_64 1/3
Running scriptlet: kernel-ml-core-5.7.7-1.el8.elrepo.x86_64 1/3
Installing : kernel-ml-modules-5.7.7-1.el8.elrepo.x86_64 2/3
Running scriptlet: kernel-ml-modules-5.7.7-1.el8.elrepo.x86_64 2/3
Installing : kernel-ml-5.7.7-1.el8.elrepo.x86_64 3/3
Running scriptlet: kernel-ml-core-5.7.7-1.el8.elrepo.x86_64 3/3
Running scriptlet: kernel-ml-5.7.7-1.el8.elrepo.x86_64 3/3
Verifying : kernel-ml-modules-5.7.7-1.el8.elrepo.x86_64 1/3
Verifying : kernel-ml-core-5.7.7-1.el8.elrepo.x86_64 2/3
Verifying : kernel-ml-5.7.7-1.el8.elrepo.x86_64 3/3
Installed:
kernel-ml-5.7.7-1.el8.elrepo.x86_64
kernel-ml-core-5.7.7-1.el8.elrepo.x86_64
kernel-ml-modules-5.7.7-1.el8.elrepo.x86_64
Complete!Linux Kernel 5.7 has been installed on our CentOS 8 server.
To load the new Linux kernel we need to restart the CentOS 8 machine.
# systemctl rebootAfter reboot, the newly installed Linux Kernel 5.7 has been added to the GRUB boot menu.
Do not confuse with the long list of kernels in following screenshot. It is because, we have experimented with the different versions of Linux kernels. In your case, there will be only two boot menu entries.
Start the CentOS 8 operating system with Linux Kernel 5.7.
After CentOS 8 startup, execute the following command at Linux CLI to verify the active Kernel version.
# uname -r
5.7.7-1.el8.elrepo.x86_64We have successfully upgrade Linux Kernel to latest version i.e. 5.7 on CentOS 8.
Uninstall Old Linux Kernel
Uninstall process of Linux Kernel 5.7 is very straight forward, But we have included it in this article for the sake of completeness.
Restart your CentOS 8 machine.
# systemctl rebootStart the Linux operating system with a previous version of Linux Kernel.
After successful startup, verify the active kernel version by executing the following command at Linux CLI.
# uname -r
4.18.0-193.6.3.el8_2.x86_64Our CentOS 8 operating system is now using our previous Linux kernel.
Use dnf command to uninstall Linux Kernel 5.7 as follows.
# dnf remove -y kernel-ml
Dependencies resolved.
================================================================================
Package Arch Version Repository Size
================================================================================
Removing:
kernel-ml x86_64 5.7.7-1.el8.elrepo @elrepo-kernel 0
Removing unused dependencies:
kernel-ml-core x86_64 5.7.7-1.el8.elrepo @elrepo-kernel 64 M
kernel-ml-modules x86_64 5.7.7-1.el8.elrepo @elrepo-kernel 23 M
Transaction Summary
================================================================================
Remove 3 Packages
Freed space: 87 M
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Erasing : kernel-ml-5.7.7-1.el8.elrepo.x86_64 1/3
Erasing : kernel-ml-modules-5.7.7-1.el8.elrepo.x86_64 2/3
Running scriptlet: kernel-ml-modules-5.7.7-1.el8.elrepo.x86_64 2/3
Running scriptlet: kernel-ml-core-5.7.7-1.el8.elrepo.x86_64 3/3
Erasing : kernel-ml-core-5.7.7-1.el8.elrepo.x86_64 3/3
Running scriptlet: kernel-ml-core-5.7.7-1.el8.elrepo.x86_64 3/3
Verifying : kernel-ml-5.7.7-1.el8.elrepo.x86_64 1/3
Verifying : kernel-ml-core-5.7.7-1.el8.elrepo.x86_64 2/3
Verifying : kernel-ml-modules-5.7.7-1.el8.elrepo.x86_64 3/3
Removed:
kernel-ml-5.7.7-1.el8.elrepo.x86_64
kernel-ml-core-5.7.7-1.el8.elrepo.x86_64
kernel-ml-modules-5.7.7-1.el8.elrepo.x86_64
Complete!Restart the CentOS 8 machine again.
# systemctl reboot
You can see that the Linux Kernel 5.7 has been removed from the GRUB boot menu. Linux Kernel 5.7 has been uninstalled now.
Building a Debugger
$35.99 (as of February 21, 2025 15:19 GMT +00:00 – More infoProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on [relevant Amazon Site(s), as applicable] at the time of purchase will apply to the purchase of this product.)Conclusion – Upgrade Linux Kernel
Upgrading the Linux kernel in CentOS 8 is essential for enhancing system stability, security, and hardware support. By following the upgrade process, including enabling the ELRepo repository, installing the latest kernel version, and updating the GRUB bootloader, you can ensure a smooth transition to an improved kernel.
Always verify the upgrade by checking the kernel version and testing system functionality before removing older versions.
Whether you need cloud optimization, server management, or automation, I provide comprehensive AWS and Linux services. Hire me on Fiverr to elevate your systems.
FAQs
Why should I upgrade the Linux kernel in CentOS 8?
Upgrading the Linux kernel improves system security, stability, and hardware compatibility, ensuring better performance and protection against vulnerabilities.
What are the prerequisites for upgrading the Linux kernel?
Before upgrading, ensure you have root or sudo privileges, a backup of important data, and access to the ELRepo repository, which provides updated kernel packages.
Does upgrading the kernel affect existing applications?
In most cases, upgrading the kernel does not break applications, but it is recommended to check for compatibility issues, especially with custom drivers or third-party software.
How can I verify that the new kernel is installed successfully?
After rebooting, you can check the active kernel version using the command: uname -r If the output matches the newly installed version, the upgrade was successful.
Can I roll back to the previous kernel if something goes wrong?
Yes, CentOS allows selecting an older kernel from the GRUB menu during boot. Keeping the previous kernel installed ensures a fallback option in case of any issues.
Leave a Reply
You must be logged in to post a comment.