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How To change the default kernel in GRUB...

How To change the default kernel in GRUB for RHEL and CentOS

How To change the default kernel in GRUB for RHEL and CentOS

NetShop ISP

NetShop ISP · Blog Author

Oct 22, 2021 · Technical Tutorials

This article answers common questions such as “How to set default boot kernel in linux?”, “How to change the default boot entry for kernel?”, “How to boot with old kernel version?” and “How to revert to previous kernel version?”.

GRUB2 is the version of GRUB currently in use, at the time of publishing this article. The software was rewritten to allow plugins and expand features available in the menu system. GRUB legacy and GRUB2 are otherwise fairly similar.

Let’s continue on how you can easily change the default kernel in GRUB on your Linux RHEL or CentOS 7 Server.

Step 1. Get list of installed kernels

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

Output:

0- Red Hat Enterprise Linux Server (3.10.0-1062.7.1.el7.x86_64) 7.7 (Maipo)
1- Red Hat Enterprise Linux Server (3.10.0-1062.1.2.el7.x86_64) 7.7 (Maipo)
2- Red Hat Enterprise Linux Server (3.10.0-693.el7.x86_64) 7.4 (Maipo)
3- Red Hat Enterprise Linux Server (0-rescue-39228403a82a4e29afb7e5ca1a869adb) 7.4 (Maipo)

Step 2. Set a default kernel

grub2-set-default 1

Step 3. Verify new default kernel

# cat /boot/grub2/grubenv | grep saved

Output:

saved_entry=1

Step 4. Rebuild GRUB Config File

BIOS-based:

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

UEFI-based:

grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg

Step 4. Reboot Server

All done! You can now reboot your Linux Server to have it booted with your new default kernel.

shutdown -r now

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