How to install Jenkiins on Amazon EC2.

Here are the exact steps to install Jenkins on AWS EC2:

1 → Launch EC2 Instance:

• Log into AWS console and search for EC2 service
• Click “Launch Instance”
• Name your instance (e.g., “Jenkins-demo”)
• Select Ubuntu 22.04 LTS
• Choose t2.micro (free tier eligible)
• Select or create a key pair
• Allow HTTPS and HTTP traffic in network settings

2 → Connect to EC2:

• Click “Connect” on the EC2 instance
• Use AWS console terminal to connect

Install Java:

• Update Ubuntu: sudo apt update
• Install OpenJDK: sudo apt install openjdk-8-jdk (or version 11)

3 → Install Jenkins:

• Visit pkg.jenkins.io
• Add Jenkins repository key and repository
• Execute installation commands from the Jenkins website

Start Jenkins Service:

• Start Jenkins: sudo systemctl start jenkins
• Enable Jenkins: sudo systemctl enable jenkins
• Check status: sudo systemctl status jenkins

4 → Configure Security Group:

• Go to EC2 security groups
• Edit inbound rules
• Add new rule: Custom TCP, Port 8080
• Save rules

5 → Complete Jenkins Setup:

• Access Jenkins using EC2 public IP: http://<public-ip>:8080
• Get initial admin password: sudo cat /var/lib/jenkins/secrets/initialAdminPassword
• Install suggested plugins
• Create admin user with username and password
• Complete setup and access Jenkins dashboard