grub2-set-default

with grub2 one can use grub2-set-default in order to set default kernel to boot eg

grub2-set-default "Red Hat Enterprise Linux Server, with Linux 3.10.0-123.el7.x86_64

will ensure it boots to specified kenel ( line is taken from /boot/grub/grub.cfg )

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#grub2-grub2-set-default