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A Cloud Guru

Compiling a Linux Kernel (Ubuntu)

For most Linux administrators, updating a kernel is done through the package manager for the Linux distribution that is being used. However, there can be situations where a particular kernel version or specific kernel configurations are needed. In this lab, you will be tasked with downloading the full kernel source tree, updating the kernel configuration to certain specifications, and then compiling a new kernel image.

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Path Info

Level

Intermediate

Duration

45m

Published

Apr 03, 2020

Challenge

Enable source URIs for apt repositories.
1. Open the sources.lst file in /etc/apt/:
```
vim /etc/apt/sources.lst
```
1. Uncomment deb-src URIs manually or by substitution — :%s/# deb-src/deb-src/g
2. Resynchronize the package index files:
```
apt-get update
```

Challenge

Install dependencies

Install additional dependencies:

apt-get install -y make gcc libncurses5-dev dpkg-dev build-essential bison flex libssl-dev libelf-dev

Challenge

Download the Kernel source tree to /usr/src
1. Switch to the /usr/src directory:
```
cd /usr/src/
```
1. Download the kernel source tree:
```
apt-get install -y linux-source kernel-package
```
1. Select the following option:
```
keep the local versions currently installed
```
Challenge

Update the kernel configuration
1. Switch to the kernel source tree directory and extract the archive:
```
cd /usr/src/linux-source-[kernel_version]
tar jxvf linux-source-[kernel_version].tar.bz2
mv linux-source-[kernel_version]/* .
rm -rf ./linux-source-[kernel_version]/
```
1. Get the necessary packages
```
apt-get build-dep -y linux-source
mkdir debian/stamps
```
1. Update the kernel configuration with the make menuconfig command:
```
cp /boot/config-$(uname -r) .config
yes '' | make oldconfig
make menuconfig
```
1. Navigate with your arrow keys and use enter to go to Device Drivers > Block devices
2. Using the “n” key, exclude the following two drivers - DRBD Distributed Replicated Block Device support and Packet writing on CD/DVD media (DEPRECATED)
3. Exit the menu and save your configuration changes.
4. Prepare to compile the Kernel:
```
make clean
```
Challenge

Compile the kernel image (this step can take 15-20 minutes to complete)
1. Create the compressed kernel image by calling the bzImage target:
```
make bzImage
```
Note: This can take 15-20 minutes to complete

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.