Deploying a Java Web Application in AWS

The project involves the development and deployment of a Java application using a continuous delivery pipeline. The key components of the pipeline include:

• Version Control: Git

• Build Automation: Maven

• Testing Framework: JUnit

• CI/CD Tool: Jenkins

• Cloud Platform: AWS

The main objectives of this project were to:

• Establish a reliable and scalable development environment for Java.

• Automate the build and deployment processes to ensure consistency and efficiency using Maven.

• Implement comprehensive testing to maintain code quality.

By the end of this blog, you'll have a solid understanding of how to leverage CI/CD to automate repetitive tasks, ensure code quality, and deliver software more reliably. Join us on this journey to mastering CI/CD for Java applications!

Step1: Jenkins Server Setup in Linux VM

Go to AWS cloud and create EC2 instance like below

• Go to resources then instances

• launch instance

• Name the instance

• select os image :ubuntu

• use instance type :t2.medium

• create key pair and save it in a folder

• launch the instance

Now, enable 8080 Port Number in Security Group Inbound Rules

• Go to security , the go to security groups

• Go to edit inbound rules

Set type for https ,HTTP ,ssh and custom tc as shown.

• Connect using SSH : Go to the folder in which key pair is ,give permission 400 to the pem key file then use command ssh -i "jenkins-keypair-java.pem" ubuntu@ec2-54-227-114-12.compute-1.amazonaws.com

Now in VM

1. Install Java

sudo apt update
sudo apt install fontconfig openjdk-17-jre
java -version

3. Install Jenkins

sudo wget -O /usr/share/keyrings/jenkins-keyring.asc \
  https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key
echo deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc] \
  https://pkg.jenkins.io/debian-stable binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null
sudo apt-get update
sudo apt-get install jenkins

4. Start Jenkins

sudo systemctl enable jenkins
sudo systemctl start jenkins

5. Verify Jenkins

sudo systemctl status jenkins

6. Access jenkins server in browser using VM public ip

http://public-ip:8080/

7. Copy jenkins admin pwd

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

8. Create an Admin Account & Install Required Plugins in Jenkins.

9. Create pipeline. Pipelines are created in two ways. They are:

• Declarative pipeline- simplified way

• Scripted Pipeline - Groovy

Declarative Pipeline: Structured and simplified way to define pipelines in Jenkins. Uses predefined syntax with specific keywords. Great for standardizing pipeline definitions and simpler requirements. Offers less flexibility compared to Scripted Pipeline.

Scripted Pipeline: Allows writing pipelines as Groovy scripts. Provides more flexibility and control with Groovy scripting. Suitable for complex scenarios and advanced control flow. Can be verbose and complex compared to Declarative Pipeline.

Go to manage jenkins >> plugins >> available plugins

we will be using declarative pipeline

install git plugins if you get this error:

Failed to connect to repository : Error performing git command: ls-remote -h https://github.com/RuchiLamichhane/Java-Maven-Deploy.git HEAD

Step-2 : Configure Maven as Global Tool in Jenkins

Manage Jenkins -> Tools -> Maven Installation -> Add maven

Step- 3 : Setup Docker in Jenkins

curl -fsSL get.docker.com | /bin/bash
sudo usermod -aG docker jenkins
sudo usermod -aG docker ubuntu
sudo systemctl restart jenkins
sudo docker version

Check console output to find the building war location and create dockerfile

now go to https:publicipadress/9000/app-name