Upgrading CentOS kernel to the latest version
Installation Guide: Upgrading Kernel Version on CentOS 7 Server
This Installation Guide is designed to assist users who need to upgrade the kernel version of their CentOS 7 server. The kernel upgrade is necessary for both single and multinode installations. It is assumed that users are already familiar with yum and rpm, the software package management systems on CentOS and Red Hat, as well as the Grub boot manager.
Before proceeding with the kernel upgrade, ensure that the following prerequisites are met:
1. Access to the CentOS 7 server with administrative privileges.
2. Familiarity with the command-line interface.
3. Basic understanding of yum and rpm package management systems.
4. Knowledge of the Grub boot manager.
CentOS Kernel Upgrade
Following are the steps involved in upgrading the kernel:
- Verify the current kernel version
- Ensure that existing software packages are updated to the latest versions
- Install GPG key for ElRepo software repository
- Install the ElRepo software repository
- Verify that ElRepo's latest kernel is available
- Make sure your kernel is up to dateLoad the new kernel by rebooting
- Make sure the new kernel is running on the system
- Configure Grub according to your needs
- Install Grub configuration
If you wish to upgrade your kernel, you must be logged in as root or have access to root privileges using the sudo su command. This procedure assumes you have issued sudo -s or are logged in as root.
A comprehensive guide to upgrading the CentOS kernel & Step-by-step guide
Step #1. Update the installed packages to the latest versions and install the fastestmirror package
(needed to select the most available repository for installation at the time)
yum -y install yum-plugin-fastestmirror
Step #2. Import the public key of the ELRepo repository and install this repository
rpm -Uvh https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
Step #3. Clear the yum cache before installing
Step #4. Install thekernel-ml package from the installed repository
Step #5. Check the version of the installed kernel in the OS loader
To do this, you can use the following command:
The output will look like this
0 : CentOS Linux (5.3.8-1.el7.elrepo.x86_64) 7 (Core)
1 : CentOS Linux (3.10.0-1062.4.1.el7.x86_64) 7 (Core)
2 : CentOS Linux (3.10.0-957.el7.x86_64) 7 (Core)
3 : CentOS Linux (0-rescue-14dc8360d3c94457b2b096d6da6b8737) 7 (Core
As you can see the latest version of the kernel is marked as option 0. We set this option as the default option for the bootloader and regenerate its configuration.
grub2-mkconfig -o /boot/grub2/grub.cfg
After that, we reboot the system and after loading we check the installed kernel version
Linux 5.3.8-1.el7.elrepo.x86_64 x86_64
As you can see, the system booted with the correct kernel version. After that, you can uninstall older versions