How to change default boot entry in RHEL7

by Jephe Wu

https://access.redhat.com/solutions/1605183

Check default kernel configured 

grubby --default-kernel

Check default kernel is kernel or kernel-uek

cat /etc/sysconfig/kernel

Check entry numbering

 

awk -F\' '$1=="menuentry " {print $2}' /etc/grub2.cfg

or
grep ^menu  /etc/grub2.cfg | awk -F\'   '{print $2}'

setup default entry to reboot

use number below or menu output above

grub2-set-default 1

Note: this will change /boot/grub2/grubenv

change /etc/default/grub requires to rebuild /etc/grub2.cfg


grub2-mkconfig -o /boot/grub2/grub.cfg