• Power Up: Connect your Raspberry Pi to a power source, monitor, keyboard, and mouse.
• Boot Up: Boot the Raspberry Pi with Raspbian (or any Debian-based OS) installed.
• Connect to the Internet: Ensure your Raspberry Pi is connected to the internet via Wi-Fi or Ethernet.

Open the terminal and run the following commands to update your system:

sudo apt update
sudo apt upgrade -y

In the terminal, create a new shell script file using nano or any text editor:

nano install_jenkins.sh

Copy and paste the following script into the editor:

#!/bin/bash

sudo apt update
sudo apt upgrade -y
sudo apt install openjdk-8-jdk -y
wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -
sudo sh -c 'echo deb https://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt update
sudo apt install jenkins -y

Save the file by pressing Ctrl + X, then Y, and hit Enter.

Before running the script, make it executable:

chmod +x install_jenkins.sh

Execute the script by running the following command:

./install_jenkins.sh

The script will update the package lists, upgrade installed packages, install OpenJDK 8, add the Jenkins repository key, and finally install Jenkins.

After installation, start Jenkins:

sudo systemctl start jenkins

Enable Jenkins to start on boot:

sudo systemctl enable jenkins

By default, Jenkins runs on port 8080. Open a web browser on your Raspberry Pi or another device on the same network and navigate to:

http://<your_raspberry_pi_ip>:8080

You can find your Raspberry Pi’s IP address by running:

hostname -I

Follow the on-screen instructions to unlock Jenkins using the password found in the file /var/lib/jenkins/secrets/initialAdminPassword.

After setting up Jenkins, it is advisable to secure it by creating an admin user and setting up security options within the Jenkins interface.