Installing the Linux Kernel 6.x on AlmaLinux 9

Kernel is central component of an operating system that manages operations of computer and hardware. It basically manages operations of memory and CPU time. It is core component of an operating system. Kernel acts as a bridge between applications and data processing performed at hardware level using inter-process communication and system calls.

Step 1 - Find current kernel version

Use the uname command to display the current version of kernel the system is running.:

uname -sr

Output:

[root@vps ~]# uname -sr
Linux 5.14.0-162.6.1.el9_1.x86_64

Step 2 - Enable ELRepo

Import the public key and install the ELRepo RPM package using the below command.

rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
dnf install https://www.elrepo.org/elrepo-release-9.el9.elrepo.noarch.rpm

Output:

[root@vps ~]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
[root@vps ~]# dnf install https://www.elrepo.org/elrepo-release-9.el9.elrepo.noarch.rpm                                      Last metadata expiration check: 0:02:44 ago on Tue 03 Jan 2023 07:28:58 PM UTC.
elrepo-release-9.el9.elrepo.noarch.rpm                                                        54 kB/s |  12 kB     00:00
Dependencies resolved.
=============================================================================================================================
Package                        Architecture           Version                            Repository                    Size
=============================================================================================================================
Installing:
elrepo-release                 noarch                 9.1-1.el9.elrepo                   @commandline                  12 k

Transaction Summary
=============================================================================================================================
Install  1 Package

Total size: 12 k
Installed size: 5.0 k
Is this ok [y/N]: y
Downloading Packages:
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing        :                                                                                                     1/1
Installing       : elrepo-release-9.1-1.el9.elrepo.noarch                                                              1/1
Verifying        : elrepo-release-9.1-1.el9.elrepo.noarch                                                              1/1

Installed:
elrepo-release-9.1-1.el9.elrepo.noarch

Complete!
elrepo-kernel

Step 3 - Install kernel

Run the following command to install the latest mainline stable kernel:

dnf --enablerepo=elrepo-kernel install kernel-ml

output:

[root@vps ~]# dnf --enablerepo=elrepo-kernel install kernel-ml
ELRepo.org Community Enterprise Linux Repository - el9                                       107 kB/s | 121 kB     00:01
Last metadata expiration check: 0:00:01 ago on Tue 03 Jan 2023 07:32:57 PM UTC.
Dependencies resolved.
=============================================================================================================================
Package                          Architecture          Version                           Repository                    Size
=============================================================================================================================
Installing:
kernel-ml                        x86_64                6.1.2-1.el9.elrepo                elrepo-kernel                 18 k
Installing dependencies:
kernel-ml-core                   x86_64                6.1.2-1.el9.elrepo                elrepo-kernel                 57 M
kernel-ml-modules                x86_64                6.1.2-1.el9.elrepo                elrepo-kernel                 52 M

Transaction Summary
=============================================================================================================================
Install  3 Packages

Total download size: 108 M
Installed size: 147 M
Is this ok [y/N]: y
Downloading Packages:
(1/3): kernel-ml-6.1.2-1.el9.elrepo.x86_64.rpm                                                39 kB/s |  18 kB     00:00
(2/3): kernel-ml-core-6.1.2-1.el9.elrepo.x86_64.rpm                                           12 MB/s |  57 MB     00:04
(3/3): kernel-ml-modules-6.1.2-1.el9.elrepo.x86_64.rpm                                       9.3 MB/s |  52 MB     00:05
-----------------------------------------------------------------------------------------------------------------------------
Total                                                                                         19 MB/s | 108 MB     00:05
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing        :                                                                                                     1/1
Installing       : kernel-ml-core-6.1.2-1.el9.elrepo.x86_64                                                            1/3
 Running scriptlet: kernel-ml-core-6.1.2-1.el9.elrepo.x86_64                                                            1/3
Installing       : kernel-ml-modules-6.1.2-1.el9.elrepo.x86_64                                                         2/3
Running scriptlet: kernel-ml-modules-6.1.2-1.el9.elrepo.x86_64                                                         2/3
Installing       : kernel-ml-6.1.2-1.el9.elrepo.x86_64                                                                 3/3
Running scriptlet: kernel-ml-core-6.1.2-1.el9.elrepo.x86_64                                                            3/3
Running scriptlet: kernel-ml-6.1.2-1.el9.elrepo.x86_64                                                                 3/3
Verifying        : kernel-ml-6.1.2-1.el9.elrepo.x86_64                                                                 1/3
Verifying        : kernel-ml-core-6.1.2-1.el9.elrepo.x86_64                                                            2/3
Verifying        : kernel-ml-modules-6.1.2-1.el9.elrepo.x86_64                                                         3/3

Installed:
kernel-ml-6.1.2-1.el9.elrepo.x86_64  kernel-ml-core-6.1.2-1.el9.elrepo.x86_64  kernel-ml-modules-6.1.2-1.el9.elrepo.x86_64

Step 4 - Verify the kernel version

By default, the system will set the newly installed kernel as the default version to use and boot with.

You can verify this by running the below command,

grubby --default-kernel

Once confirmed, reboot the system to boot with the latest kernel installed. This can be further verified by running the uname command,

uname -sr

output:

[root@vps ~]# uname -sr
Linux 6.1.2-1.el9.elrepo.x86_64