Links
:crescent_moon: Lab
:spiral_notepad: Tutorial
Details
Grubby* is a flexible and powerful command-line tool that provides users with an easy way to modify the bootloader configuration used by Oracle Linux without users having to manually edit the GRUB (GRand Unified Bootloader) or GRUB2 configuration files directly. In most cases, changing the default kernel is unnecessary because Oracle Linux defaults to a configuration and behavior to use and boot the most recent kernel version first. Grubby is also scriptable, making managing your system’s default kernel requirements easier. Reasons why you should consider using grubby include:
- It has a simple command-line structure that makes managing bootloader settings much easier.
- It provides an easy way to list and manage multiple kernels, simplifying updating kernel parameters or changing the default kernel.
- It works with both UEFI and BIOS-based systems.
- It removes the risk associated with manual editing of bootloader files directly.
Objectives
In this tutorial, you’ll learn how to:
- Determine the currently loaded kernel
- Determine the default kernel
- Determine which kernel versions are available on the system
- Use grubby to manage kernels
Prerequisites
Minimum of a single Oracle Linux system
Each system should have Oracle Linux installed and configured with:
- A non-root user account with sudo access
- Access to the Internet