Jenkinsfile-CI

// JENKINS CI PIPELINE/
// Purpose: The Code will be built into executable file (.jar) & pushed to Dockerhub
// NOTE:
//  i. Store Dockerhub, EC2 pem key credentials in Jenkins Server
// ii. Install 'ssh agent' plugin in Jenkins

pipeline {
    agent any
    // DECLARE THE VARIABLES HERE:
    environment {
        DOCKER_USERNAME = "nasirpatel"     // check the 'ID' in your Jenkins credentials
    }

    stages {
        stage("1. Cleanup") {
            // Clean workspace directory for the current build
            steps {
                deleteDir ()             
            }
        }

        stage ('2. Git Checkout') {
            // use pipeline syntax generator to generate below step
            // 'Pipeline syntax' --> Steps 'Smaple step' --> git (enter url & branch & generate)
            steps {
                dir ("DevopsProject1"){
                  script {
                    git branch: 'main', url: 'https://github.com/pandacloud1/DevopsProject1.git' 
                  }
                }
            }
        }   
        
        stage("3. Maven Unit Test") {  
            // Test the individual units of code 
            steps{
                dir ("DevopsProject1"){
                  sh 'mvn test'        
                }
            }
        }

        stage('4. Maven Build') {
            // Build the application into an executable file (.jar)
            steps{
                dir ("DevopsProject1"){
                  sh 'mvn clean install'   
                }
            }
        }

        stage("5. Maven Integration Test") {
            //  Test the interaction between different units of code
            steps{
                dir ("DevopsProject1"){
                  sh 'mvn verify'          
                }
            }
        }

        stage('6. Docker Image Build') {
            // Build Docker Image 
            steps{
                dir('DevopsProject1') {      // go to directory where 'Dockerfile' is stored
                    script {
                      def JOB = env.JOB_NAME.toLowerCase()           // Convert Jenkins Job name to lower-case
                      sh "docker build -t ${JOB}:${BUILD_NUMBER} ."  // 'JOB_NAME' & 'BUILD_NUMBER' are Jenkins Global variable
                    }
                }
            }
        }
        
        stage('7. Docker Image Tag') {
            // Rename the Docker Image before pushing to Dockerhub
            steps{
                dir('DevopsProject1') {      // go to directory where Docker Image is created
                  script {
                    def JOB = env.JOB_NAME.toLowerCase() // Convert Jenkins Job name to lower-case
                    sh "docker tag ${JOB}:${BUILD_NUMBER} ${DOCKER_USERNAME}/${JOB}:v${BUILD_NUMBER}"
                    sh "docker tag ${JOB}:${BUILD_NUMBER} ${DOCKER_USERNAME}/${JOB}:latest"
                  }
                }
            } 
        }

        stage('8. Trivy Image Scan') {
            // Scan Docker images for vulnerabilities 
            steps{
                script { 
                  def JOB = env.JOB_NAME.toLowerCase() // Convert Jenkins Job name to lower-case
                  sh "trivy image ${DOCKER_USERNAME}/${JOB}:v${BUILD_NUMBER} > scan.txt"
                }
            }
        }

        stage('9. Docker Image Push') {
            // Login to Dockerhub & Push the image to Dockerhub
            steps{
                script { 
                  withCredentials([usernamePassword(credentialsId: 'my_dockerhub_creds', usernameVariable: 'docker_user', passwordVariable: 'docker_pass')]) {
                    sh "docker login -u '${docker_user}' -p '${docker_pass}'"
                    def JOB = env.JOB_NAME.toLowerCase() // Convert Jenkins Job name to lower-case
                    sh "docker push ${DOCKER_USERNAME}/${JOB}:v${BUILD_NUMBER}"
                    sh "docker push ${DOCKER_USERNAME}/${JOB}:latest"
                  }
                }
            }
        }

        stage('10. Docker Image Cleanup') {
            // Remove the unwanted (dangling) images created in Jenkins Server to free-up space
            steps{
                script { 
                  sh "docker image prune -af"
                }
            }
        }
    }
}