Now with grubby we have listed the available boot entries, to get more information on individual boot entries we can use: # grubby -info='/boot/vmlinuz-4.18.0-193.14.3.el8_2.x86_64'Īrgs='ro resume=/dev/mapper/rhel-swap rd.lvm.lv=rhel/root rd.lvm.lv=rhel/swap rhgb quiet biosdevname=0 net.ifnames=0 enforcing=0 $tuned_params' To check the currently active kernel version we will use uname with -r which will give us kernel release information: # uname -r This will print the initramfs version of all the installed kernels.

You can use grubby to get a cleaner output for list of installed kernels # grubby -info=ALL | grep ^kernel Here we got a long list of kernel and it's dependent packages. You can read more about these kernel rpms in What are kernel-core and kernel-module rpms and how to upgrade these rpmsĪLSO READ: How to Install Apr And Apr-Util in Linux With RHEL/CentOS 8 now the kernel rpm is distributed across kernel-core and kernel-modules. So we will switch between these kernel versions in our example. If no bootloader configuration file is found, grubby will use the default value for that architecture for example grub2 for x86_64 machines, elilo for ia64 etcįor the sake of this tutorial I have installed multiple kernels on my Red Hat 8 server.It is primarily designed to be used from scripts which install new kernels and need to find information about the current boot environment.

It is used for updating and displaying information about the configuration files for various architecture specific bootloaders.grubby is a command line tool used to configure bootloader menu entries across multiple architectures.Hence now we have a special designated tool called grubby to change default kernel versions The steps involved with RHEL/CentOS 8 are completely different compared to older releases as GRUB2 has been further upgraded to what we had with RHEL/CentOS 7. switch between different installed kernel versions in RHEL/CentOS 8.

In this tutorial we will learn the steps to change default kernel version i.e.

Latest rhel 8 version