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A Cloud Guru

Modifying GRUB2 Boot Configuration (CentOS)

The GRUB2 bootloader provides many improvements over its predecessor GRUB. This includes support for UUIDs, LVM, and RAID, and a more programmatic approach to configuration. In this hands-on lab, we have been tasked with updating the GRUB configuration and applying these changes.

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Path Info

Level

Intermediate

Duration

30m

Published

Oct 23, 2020

Challenge

Update /etc/default/grub
Use a text editor to edit /etc/default/grub and ensure that the following options and values are present:
```
GRUB_TIMEOUT=45
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true
```
Challenge

Create a Custom Menu Entry

Copy the menuentry for a line that starts with menuentry 'CentOS Linux (3.10...) /boot/grub2/grub.cfg and add it to /etc/grub.d/40_custom.

Once copied, remove the rhgb and quiet options from the kernel line and change the title to Verbose Output Enabled.
Challenge

Create a Backup of the Configuration File
Use the cp command to create a backup of grub.cfg.
```
cp /boot/grub2/grub.cfg /boot/grub2/grub.cfg.bkp
```
Challenge

Generate a New Configuration File with the Changes
Use the grub2-mkconfig command to generate a new grub.cfg file.
```
grub2-mkconfig -o /boot/grub2/grub.cfg
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.