grubby

grubby is provided by package grubby on RHEL based systems. To install grubby, run

yum install grubby

To list all kernels, run

grubby --info=ALL

To view the default kernel, run

grubby --default-kernel

To set a kernel default, you need to specify the vmlinux file, example

grubby --set-default  /boot/vmlinuz-3.10.0-962.3.2.lve1.5.73.el7.x86_64

Or specify the index

grubby --set-default-index 2

Back to grub