How to Install and configure Jenkins on AlmaLinux 9

To install Jenkins on AlmaLinux 9, follow these steps:

Step 1 : Update the System

Run the following command to update your system packages:

sudo dnf update -y

Step 2 : Install OpenJDK

Jenkins requires Java. Install OpenJDK with:

sudo dnf install java-21-openjdk -y

Step 3 : Add Jenkins Repository Key

sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io-2023.key

Step 4 : Add Jenkins Repository

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

Step 5 : Install Jenkins

sudo dnf install jenkins -y

Step 6 : Start Jenkins

sudo systemctl start jenkins

Step 7 : Enable Jenkins to Start on Boot

sudo systemctl enable jenkins

Step 8 : Check Jenkins Status

sudo systemctl status jenkins

Step 9 : Configure Firewall (if applicable)

If you have firewalld enabled, allow Jenkins port (8080):

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

Step 10 : Retrieve the Initial Admin Password

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

Step 11 : Access Jenkins

Open your web browser and go to:

http://your-server-ip:8080

- Enter the initial admin password when prompted.

- Click "Install suggested plugins" and wait for the process to complete.



- Fill in the required details to set up an admin account.

- Set your preferred Jenkins URL in the configuration settings.

Click "Start using Jenkins" to finish the setup.

Congratulations! You have successfully installed and configured Jenkins on AlmaLinux 9.