• Description:
  Installing Jenkins involves setting up the required Java environment, adding the official Jenkins repository, and installing the Jenkins package on the system. After installation, the Jenkins service is started and accessed through a web browser, where the initial setup is completed by unlocking Jenkins, installing recommended plugins, and creating an admin user to confirm that Jenkins is running and ready for use.

•  Step 1: Update System
   sudo apt update
   sudo apt upgrade -y
•  Step 2: Install Java (Jenkins Requires Java 17+)
   Install OpenJDK 17 (recommended):
   sudo apt install openjdk-17-jdk -y
  
   Verify Java:
   java -version
•  Step 3: Add Jenkins Repository Key
   curl -fsSL https://pkg.jenkins.io/debian/jenkins.io-2023.key | sudo tee /usr/share/keyrings/jenkins-keyring.asc > /dev/null
•  Step 4: Add Jenkins Package 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
•  Step 5: Install Jenkins
   sudo apt update
  
   sudo apt install jenkins -y
•  Step 6: Start & Enable Jenkins Service
   sudo systemctl start jenkins
   sudo systemctl enable jenkins
•  Step 7: Allow Firewall (if using UFW)
   sudo ufw allow 8080
   sudo ufw enable
   sudo ufw status
•  Step 8: Open Jenkins in Browser
   http://localhost:8080
•  Step 9: Get Initial Admin Password
   sudo cat /var/lib/jenkins/secrets/initialAdminPassword
  
   Pwd: 55c9081710834f7581cf4993e174d038
  
   Copy the password → paste it into Jenkins setup page.

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