RedHat Kernel Upgrading and Downgrading

*OS: Redhat Enterprise Linux 8.2 Linux Updated Kernel 4.18.0- 193.19.1.el8_2.x86_64 (This kernel version is our requirment) Default Linux Kernel 4.18.0- 193.28.1.el8_2.x86_64 (This is default kernel version) Steps:

1. Linux Kernel Upgrading/Downgrading method:

Following link for downloading the required kernel version but you can follow as per your requirements: Link: https://rpmfind.net/linux/RPM/centos/8.2.2004/baseos/x86_64/Packages/kernel-4.18.0-193.19.1.el8_2.x86_64.html

2. Direct Installation from web using dnf

Run this command on terminal

dnf install

e.g https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm

Note: Update the above web link of downloading file source after dnf install.

3. Easy steps to change default kernel version RHEL/CentOS
4. Check the isntalled kernels in the systems using this command

rpm -qa | grep kernel | sort

you cant find the kernel in the list with versions which you installed recently. check your installed kernel version in the lsit. 5. currently active kernel version

uname -r

6. We can check all the available boot items using grubby

grubby --info="/boot/vmlinuz-4.18.0-193.14.3.el8_2.x86_64"

7. Now active the kernel version which we need using this command

grubby --set-default "/boot/vmlinuz-4.18.0-193.1.2.el8_2.x86_64"

8. Now Reboot the system and check the kernel is updated

reboot

uname -r