Jenkins is an open-source automation server that enables developers to automate parts of the software development process related to building, testing, and deploying. In this guide, we will walk through the steps to install Jenkins on AlmaLinux 8.

Step 1: Update Your System

Start by ensuring your system is up to date:

sudo dnf update -y

Step 2: Install Java

Jenkins requires Java to run. Install the OpenJDK package:

sudo dnf install -y java-11-openjdk-devel

Step 3: Add the Jenkins Repository

Add the Jenkins repository to your system:

sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat/jenkins.repo

sudo rpm --import https://pkg.jenkins.io/redhat/jenkins.io.key

Step 4: Install Jenkins

Now, install Jenkins using the following command:

sudo dnf install -y jenkins

Step 5: Start and Enable Jenkins

After installation, start the Jenkins service and enable it to run at boot:

sudo systemctl start jenkins
sudo systemctl enable jenkins

Step 6: Adjust the Firewall

If you have a firewall enabled, allow traffic on port 8080 (the default Jenkins port):

sudo firewall-cmd --permanent --add-port=8080/tcp
sudo firewall-cmd --reload

Step 7: Access Jenkins

Open your web browser and navigate to:

http://your_server_ip:8080

You should see the Jenkins setup wizard. To unlock Jenkins, you will need to provide the initial admin password found in:

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

Step 8: Complete the Setup

Follow the on-screen instructions to complete the Jenkins setup. You can install suggested plugins and create your first admin user.

Conclusion

You have successfully installed Jenkins on AlmaLinux 8. This automation server will help streamline your software development process.

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