Install Jenkin Server

To install Jenkins on Ubuntu 22.04, follow these steps:

1. Update the System

Ensure your system is up to date by running:

sudo apt update
sudo apt upgrade -y

2. Install Java

Jenkins requires Java. Install OpenJDK 17 (recommended for Jenkins):

sudo apt install openjdk-17-jdk -y

Verify the installation:

java -version

3. Add Jenkins Repository

Jenkins is not in the default Ubuntu repositories. Add the official Jenkins repository:

Import the GPG Key:

curl -fsSL https://pkg.jenkins.io/debian/jenkins.io-2023.key | sudo tee \
  /usr/share/keyrings/jenkins-keyring.asc > /dev/null

Add the Jenkins Repository:

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

4. Install Jenkins

After adding the repository, install Jenkins with the following:

sudo apt update
sudo apt install jenkins -y

5. Start and Enable Jenkins Service

Start the Jenkins service and enable it to run on boot:

sudo systemctl start jenkins
sudo systemctl enable jenkins

Verify the Jenkins service status:

sudo systemctl status jenkins

6. Open Firewall for Jenkins

By default, Jenkins runs on port 8080. Allow this port through the firewall:

sudo ufw allow 8080
sudo ufw reload

7. Access Jenkins

Open your browser and navigate to: http://your_server_ip:8080 Replace your_server_ip with your server’s IP or localhost if accessing locally.
Unlock Jenkins:
- Run the following command to get the initial admin password: sudo cat /var/lib/jenkins/secrets/initialAdminPassword
- Copy the password and paste it into the browser.
Follow the on-screen instructions to complete the setup.

8. (Optional) Install Plugins and Configure Jenkins

During setup, you can choose to install Suggested Plugins or manually select plugins.
Create an admin user when prompted.

Jenkins should now be successfully installed and accessible! If you need further configuration or help, let me know.