Jenkins is popular and an open-source Java-based automation server. It’s a continuous integration tool that offers number of plugins for building deployments and automation for your applications. This also helps to automate the repetitive tasks involved in the software development process. In this tutorial, we will cover how to install Jenkins on CentOS 8 system.
Step 1 – Prerequisites
- You must be login as root or user with sudo privileges.
- Jenkins is written in Java, it required Java runtime environment for running. If you don’t have Java installed on your system, run below commands to install Java:
sudo dnf install java-1.8.0-openjdk-devel
Step 2 – Enable Jenkins PPA
We will download and import the Jenkins repository GPG keys using wget:
sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat-stable/jenkins.repo
sudo rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key
Step 3 – Install Jenkins on CentOS
Run the following command to install the latest version of Jenkins:
sudo yum install jenkins
The default Jenkins runs on port
8080. If other service is using same port, you can edit
/etc/default/jenkins configuration file and update
HTTP_PORT value to
8081 or other port.
After that, start the Jenkins service and enable it to start on system boot:
sudo systemctl start jenkins
sudo systemctl enable jenkins
Check the status of Jenkins service by typing:
sudo systemctl status jenkins
It should show output as below:
Loaded: loaded (/etc/rc.d/init.d/jenkins; generated) Active: active (running) since Thu 2020-04-20 13:45:26 UTC; 36s ago
Step 4 – Adjust Firewall
If your server is secure under firewall, you need to open port
sudo firewall-cmd --permanent --zone=public --add-port=8080/tcp
sudo firewall-cmd --reload
Step 5 – Setting Up Jenkins
To access your server, open your favorite browser and type your domain or IP address, followed by port 8080 (or changed port), http://your_domain_or_ip_address:8080.
It will show screen as below.
The default installation password can be found at
/var/lib/jenkins/secrets/initialAdminPassword as showing in above image. To find the password type:
sudo cat /var/lib/jenkins/secrets/initialAdminPassword
Enter the password it into the Administrator password field and click on
Next, you will be asked to install suggested plugins or you want to select specific plugins. Click on the
Install suggested plugins box, and the installation process will start immediately.
Next, create an admin account for your Jenkins setup. Fill out the required information and click Save and Continue.
After that, page will ask you to set the URL for your Jenkins instance. The field will be populated with an automatically generated URL.
Check the URL and click on the
Save and Finish button to complete the process.
Click on the
Start using Jenkins button, and you will be redirected to the Jenkins dashboard logged in as the admin user you have created in one of the previous steps.
That’s it, you’ve successfully installed Jenkins on your system.
You have learned how to install and complete the initial configuration of Jenkins on CentOS 8 system. You can take a look at official Jenkins documentation page to learn more about Jenkins.
If you have any questions or suggestion, please leave a comment below.