Jenkins is an open-source automation server used to automate the building, testing, and deployment of software projects. In this guide, we will walk you through the steps to install Jenkins on Ubuntu 22.04.

Step 1: Update Your System

Before installing Jenkins, it's important to update your system's package index. Run the following command to update and upgrade your system:

sudo apt update && sudo apt upgrade

Step 2: Install Java

Jenkins requires Java to run. You can install the OpenJDK package, which is the recommended Java distribution for Jenkins:

sudo apt install openjdk-11-jdk

Once installed, verify the Java installation:

java -version

Step 3: Add the Jenkins Repository

Next, you need to add the Jenkins package repository to your system:

wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -

Add the Jenkins repository to your system:

sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'

Step 4: Install Jenkins

After adding the repository, update the package list and install Jenkins:

sudo apt update
sudo apt install jenkins

Step 5: Start and Enable Jenkins

Once installed, start the Jenkins service and enable it to start automatically at boot:

sudo systemctl start jenkins
sudo systemctl enable jenkins

Step 6: Adjust the Firewall

If you are using a firewall, ensure that Jenkins can be accessed via port 8080. Run the following command to allow traffic on this port:

sudo ufw allow 8080

Check the status of the firewall to ensure the rule has been added:

sudo ufw status

Step 7: Set Up Jenkins

Now that Jenkins is installed, you can complete the initial setup. Open your browser and go to http://your_server_ip:8080. You will be prompted to enter the initial admin password, which can be found in the following file:

sudo cat /var/lib/jenkins/secrets/initialAdminPassword

Copy and paste the password into the setup wizard, then follow the on-screen instructions to complete the setup.

Conclusion

You have successfully installed Jenkins on Ubuntu 22.04. Jenkins is now ready to automate your software development process by handling tasks such as building, testing, and deploying code.

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