If you are keen to extract more information about any specific available kernel version use -info option with the grubby command. List the vmlinuz file under /boot partition. To get to know the index number of current kernel we can use ~]# grubby ~]# We are able to see the default kernel version is latest one same as uname -r gives. Verifying the default kernel version using grubby. But, our goal it to go back to the previous ~]# uname ~]# Using Grubby to Verify Let me list the installed kernel versions using yum command.
Moreover, to make any persistent changes it’s super easy and safe. It helps to update and print the information about GRUB 2. To perform upcoming actions, We are about to use the grubby tool. This guide applies for RHEL, CentOS and Oracle Linux as well. In such a scenario, let see how to set the old kernel version as default one in RHEL 7 and 8 based operating system. But, while trying to start the application it failed and the application team requested to rollback only the kernel version. Right after completing the upgrade, took a reboot.
I have run the # yum update -y to upgrade all the packages which include kernel. In todays guide let us see how to set default kernel in case if we are installed with multiple kernel versions.
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