Question

You have compiled a new kernel using rpm. when you reboot, the new kernel is not the default selection on the boot menu. you use the grub 2 boot loader. what might you need to do to fix the problem?

Answer 1

First, rpm is RedHat Package Manager. Compilation is done with gcc, the GNU C Compiler.

To add that kernel to grub2's menu, as root you'd need to run:

grub2-mkconfig > /boot/grub2/grub.cfg #redirection is favored by Red Hat

Check out the man page @ man grub2-mkconfig