End-to-End CI/CD Pipeline: From GitHub to Docker Hub Using Jenkins

🚀 Automating Java Application Deployment with Maven, Docker, and Jenkins

Introduction

In this blog post, I’ll walk you through how I automated the end-to-end build and deployment process of a Java application using Maven, Docker, and Jenkins. From compiling the code to pushing a Docker image into Docker Hub, this pipeline demonstrates a real-world DevOps workflow.

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🧩 Prerequisites

• Basic knowledge of Git, Maven, Docker, and Jenkins

• Installed: Git, Java, Maven, Docker, Jenkins

• GitHub repository with a Java project (Spring Boot preferred)

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🔧 Step 1: Build the Application Using Maven

Explain how you cloned your GitHub repo and used Maven to generate the .jar file.

Commands used:

bashCopyEditmvn clean package

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📦 Step 2: Dockerize the Application

Show your Dockerfile and explain each line.

Sample Dockerfile:

DockerfileCopyEditFROM openjdk:17
COPY target/myapp.jar app.jar
ENTRYPOINT ["java", "-jar", "app.jar"]

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🧪 Step 3: Test Docker Image Locally

Build and run the Docker image locally.

bashCopyEditdocker build -t myapp .
docker run -p 8080:8080 myapp

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🚀 Step 4: Push Docker Image to Docker Hub

Tag and push the Docker image.

bashCopyEditdocker tag myapp mydockerhubusername/myapp
docker push mydockerhubusername/myapp

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🤖 Step 5: Automate the Workflow with Jenkins

Describe how you used the Docker Pipeline plugin in Jenkins.

• Jenkinsfile example:

pipeline {
    agent any

    stages {
        stage('Clone') {
            steps {
                git 'https://github.com/your-username/your-repo.git'
            }
        }
        stage('Build with Maven') {
            steps {
                sh 'mvn clean package'
            }
        }
        stage('Build Docker Image') {
            steps {
                script {
                    dockerImage = docker.build("your-dockerhub-username/your-image-name")
                }
            }
        }
        stage('Push to Docker Hub') {
            steps {
                script {
                    docker.withRegistry('https://index.docker.io/v1/', 'dockerhub-credentials-id') {
                        dockerImage.push('latest')
                    }
                }
            }
        }
    }
}