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Jenkins in AWS

Here’s how we can quickly launch a Jenkins instance on AWS EC2:

🚀 Launch Jenkins on AWS EC2

1. Login to AWS Console and go to the EC2 service. Click “Launch Instance.”
2. Select an Amazon Machine Image:
   • Amazon Linux 2 AMI (HVM), SSD Volume Type
3. Choose Instance Type:
   • t2.micro (free tier eligible)
4. Configure Instance Details:
   • Keep defaults. In “Advanced Details,” add the following user data script to install and start Jenkins automatically:

   #!/bin/bash
   $wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo  
   $rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key
   $yum install -y java jenkins
   $chkconfig --add jenkins
   $systemctl start jenkins
   

5. Add Storage:
   • We can keep the default or adjust as needed.
6. Add Tags:
   • (Optional) Add tags for organization.
7. Configure Security Group:
   • Allow SSH (port 22, source: My IP)
   • Allow HTTP (port 8080, source: My IP or 0.0.0.0/0 for public access)

   

8. Review and Launch:
   • Select an existing key pair or create a new one for SSH access.

🌐 Access Jenkins

• After launch, get the public DNS of our EC2 instance.
• Access Jenkins at: http://<Public_DNS>:8080

🔑 Unlock Jenkins

When Jenkins starts, it will prompt for an administrator password. We retrieve it by connecting to our instance:

# Connect to the instance
ssh -i <key_name>.pem ec2-user@<aws-instance-public-dns>

# Get the Jenkins admin password
sudo cat /var/lib/jenkins/secrets/initialAdminPassword

We’re now ready to finish Jenkins setup in our browser!