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Change the default kernel that boots from GRUB

The GRUB configuration file can be found in /boot/grub/.

[root@root /boot/grub]# ls -la grub.conf menu.lst
-rw——-    1 root     root         1037 Oct 28 11:41 grub.conf
lrwxr-xr-x    1 root     root           11 Jan  1  2003 menu.lst -> ./grub.conf
If grub.conf does not exist then simply edit menu.lst which should be a file instead of a symlink to grub.conf.

Here is an example configuration:

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/hda3
#          initrd /initrd-version.img
#boot=/dev/hda
default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Enterprise Linux ES (2.4.21-37.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-37.EL ro root=/dev/hda3
initrd /initrd-2.4.21-37.EL.img
title Red Hat Enterprise Linux ES (2.4.21-32.0.1.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-32.0.1.EL ro root=/dev/hda3
initrd /initrd-2.4.21-32.0.1.EL.img
title Red Hat Enterprise Linux ES (2.4.21-27.0.4.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-27.0.4.EL ro root=/dev/hda3
initrd /initrd-2.4.21-27.0.4.EL.img
title Red Hat Enterprise Linux ES (2.4.21-27.0.2.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-27.0.2.EL ro root=/dev/hda3
initrd /initrd-2.4.21-27.0.2.EL.img
The default line is the line we want to change. The first title is 0. So if I wanted title Red Hat Enterprise Linux ES (2.4.21-27.0.2.EL) to be the default kernel I would set defualt= to 4.
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/hda3
#          initrd /initrd-version.img
#boot=/dev/hda
default=4
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Enterprise Linux ES (2.4.21-37.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-37.EL ro root=/dev/hda3
initrd /initrd-2.4.21-37.EL.img
title Red Hat Enterprise Linux ES (2.4.21-32.0.1.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-32.0.1.EL ro root=/dev/hda3
initrd /initrd-2.4.21-32.0.1.EL.img
title Red Hat Enterprise Linux ES (2.4.21-27.0.4.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-27.0.4.EL ro root=/dev/hda3
initrd /initrd-2.4.21-27.0.4.EL.img
title Red Hat Enterprise Linux ES (2.4.21-27.0.2.EL)
root (hd0,0)
kernel /vmlinuz-2.4.21-27.0.2.EL ro root=/dev/hda3
initrd /initrd-2.4.21-27.0.2.EL.img

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Linux
Managed Services

Just Leave Linux to Us
Is maintaining your Linux server keeping your team bogged down? Alleviate unnecessary stress with one of Hivelocity’s Linux Managed Services plans. With reboots, monitoring, updates, and more, your team can rest easy knowing your hardware and OS are in the hands of hosting experts.

Configure your server today and see the benefits a Hivelocity managed Linux solution can offer you!