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How to Install Jenkins on Ubuntu (Step-by-Step Guide)

How to Install Jenkins on Ubuntu (Step-by-Step Guide)

If you're a developer or DevOps engineer, Jenkins is one of the most powerful tools you can have in your CI/CD pipeline. In this guide, we’ll walk through how to install Jenkins on an Ubuntu system from scratch — including the setup of Java, system services, and how to access the Jenkins dashboard.

📋 Prerequisites

Before diving in, make sure:

  • You're running Ubuntu 22.04 LTS or similar

  • You have sudo privileges

  • Your system has access to the internet

☕ Step 1: Install Java

Jenkins requires Java 17 or newer. Here’s how to install OpenJDK 17:

sudo apt update
sudo apt install fontconfig openjdk-21-jre

You can verify the installation:

java -version
openjdk version "21.0.3" 2024-04-16
OpenJDK Runtime Environment (build 21.0.3+11-Debian-2)
OpenJDK 64-Bit Server VM (build 21.0.3+11-Debian-2, mixed mode, sharing)

📦 Step 2: Add Jenkins Repository

Jenkins isn’t in Ubuntu’s default repos, so you’ll need to add the Jenkins APT repo and its GPG key.

sudo wget -O /etc/apt/keyrings/jenkins-keyring.asc \
  https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key
echo "deb [signed-by=/etc/apt/keyrings/jenkins-keyring.asc]" \
  https://pkg.jenkins.io/debian-stable binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null

Update your package list:

sudo apt update

🛠 Step 3: Install Jenkins

Now install Jenkins with:

sudo apt install -y jenkins

🔌 Step 4: Start and Enable Jenkins

To start Jenkins and enable it to launch at boot:

sudo systemctl start jenkins
sudo systemctl enable jenkins

Check status:

sudo systemctl status jenkins

Jenkins runs on port 8080 by default.

🌐 Step 5: Access Jenkins

Open your browser and go to:

http://<your-server-ip>:8080

To unlock Jenkins:

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

Paste this into the setup wizard, install the recommended plugins, and create your first admin user.

⚙️ Optional: Change Jenkins Port

To change the port from 8080 to another:

sudo systemctl edit jenkins

Then add:

[Service]
Environment="JENKINS_PORT=8081"

Save and reload:

sudo systemctl daemon-reexec
sudo systemctl restart jenkins

✅ Conclusion

With Jenkins installed and running, you're ready to create your first pipeline, automate your deployments, and integrate with tools like GitHub, Docker, and Kubernetes.

Looking for Docker or Kubernetes installation instead? Let me know, and I’ll walk you through that too.

🔗 Official Jenkins Guide:

https://www.jenkins.io/doc/book/installing/linux/#ubuntu-debian 

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