Java Spring Boot CI/CD with Jenkins, SonarQube, Docker, Kubernetes & ArgoCD

This project demonstrates a complete DevOps workflow using a Java Spring Boot application with CI/CD pipeline powered by Jenkins, SonarQube, Docker, Kubernetes, and ArgoCD.

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Tools Used

Tool	Purpose
Spring Boot	Web application framework
Jenkins	CI/CD automation
SonarQube	Code quality and static analysis
Docker	Containerization
Kubernetes	Application deployment and scaling
ArgoCD	GitOps-based continuous delivery
GitHub	Code and deployment manifest hosting
Docker Hub	Container image registry

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Step-by-Step Setup Instructions

1. Install Jenkins

sudo apt update
sudo apt install openjdk-17-jdk -y
wget -q -O - https://pkg.jenkins.io/debian-stable/jenkins.io.key | sudo apt-key add -
sudo sh -c 'echo deb https://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'
sudo apt update
sudo apt install jenkins -y
sudo systemctl enable jenkins
sudo systemctl start jenkins

Access Jenkins at http://<ip>:8080. To get the password:

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

Install suggested plugins and also install:

• Docker Pipeline

• SonarQube Scanner

• GitHub Plugin

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2. Install Docker

sudo apt install docker.io -y
sudo systemctl enable docker
sudo systemctl start docker
sudo usermod -aG docker jenkins
sudo systemctl restart jenkins

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3. Install SonarQube

sudo apt update
sudo apt install openjdk-17-jdk unzip wget -y
sudo adduser sonarqube
cd /opt
sudo wget https://binaries.sonarsource.com/Distribution/sonarqube/sonarqube-9.9.4.87374.zip
sudo unzip sonarqube-9.9.4.87374.zip
sudo mv sonarqube-9.9.4.87374 sonarqube
sudo chown -R sonarqube:sonarqube /opt/sonarqube
sudo chmod -R 775 /opt/sonarqube
sudo su -s /bin/bash sonarqube
cd /opt/sonarqube/bin/linux-x86-64/
./sonar.sh start
./sonar.sh status

Access SonarQube at http://<ip>:9000 and log in using admin/admin. Create a project and generate a token.

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4. Add Credentials in Jenkins

Go to Manage Jenkins > Credentials > Global > Add Credentials:

• GitHub: Username + Token (with repo access)

• Docker Hub: Username + Docker token

• SonarQube: Secret text (Sonar token)

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5. Install Kubernetes CLI and Start Cluster

curl -LO "https://dl.k8s.io/release/$(curl -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
chmod +x kubectl
sudo mv kubectl /usr/local/bin/

Start your Kubernetes cluster using your preferred method.

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6. Install and Configure ArgoCD

kubectl create namespace argocd
kubectl apply -n argocd -f https://raw.githubusercontent.com/argoproj/argo-cd/stable/manifests/install.yaml
kubectl patch svc argocd-server -n argocd -p '{"spec": {"type": "NodePort"}}'
kubectl get svc argocd-server -n argocd

Get ArgoCD password and access it from the browser:

kubectl get secret -n argocd
kubectl edit secret argocd-initial-admin-secret -n argocd
echo <password> | base64 --decode

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7. Configure ArgoCD Application

Use the UI to configure an application:

• Git Repo: Link to your repo

• Path: springboot-app-manifests

• Namespace: default

• Sync: Auto or Manual

Ensure the service in service.yml is of type NodePort to allow browser access.

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Jenkins Pipeline Flow

1. Pull code from GitHub

2. Run SonarQube analysis

3. Build app using Maven

4. Build Docker image and push to Docker Hub

5. Update deployment.yml with new image

6. Push updated YAMLs to GitHub

7. ArgoCD detects changes and deploys the app

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This project demonstrates a complete end-to-end DevOps CI/CD pipeline for a Java Spring Boot web application using Jenkins, SonarQube, Docker, Kubernetes, ArgoCD.