Update Jenkinsfile

Dockerfile

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+# Specify the base image
+FROM node:alpine
+# Set the working directory
+WORKDIR /app
+# Copy the package.json and package-lock.json files
+COPY package*.json ./
+# Install the dependencies
+RUN npm install
+# Copy the app files
+COPY . .
+# Build the app
+RUN npm run build
+# Expose the port
+EXPOSE 3000
+# Run the app
+CMD ["npm", "start"]

Jenkinsfile

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+pipeline {
+    agent any
+    environment {
+        IMAGE_NAME = "mz-react-todo"
+        IMAGE_TAG = "latest"
+        NEXUS_URL = "nginx-nexus.connectme365.com/hosted"
+        DOCKER_SWARM_MANAGER = "jenkins@10.3.31.84"
+        NEXUS_CREDENTIALS_ID = "jenkins-mz-rd"
+        SSH_CREDENTIALS_ID = "publish_via_ssh"
+    }
+    stages {
+        stage('Clone Repo'){
+            steps{
+                echo "Clean the workspace"
+                deleteDir()
+                echo "Cloning source code ..."
+                git branch: 'master', credentialsId: 'systemservices-github', url: 'git@github.com:mcl-michaelz/simple-node-js-react-npm-app.git'
+            }
+        }
+        stage('Build App'){
+            agent {
+                docker {
+                    image 'node:16'
+                    args '-u root'
+                    // Run the container on the node specified at the
+                    // top-level of the Pipeline, in the same workspace,
+                    // rather than on a new node entirely:
+                    reuseNode true
+                }
+            }
+            steps {
+                echo "Building React App ..."
+                sh '''
+                    pwd & ls -l
+                    npm install
+                    npm run build
+                '''
+            }
+        }
+        stage('Build Docker Image') {
+            steps {
+                echo 'Building Docker image...'
+                sh '''
+                    docker build -t ${NEXUS_URL}/${IMAGE_NAME}:${IMAGE_TAG} .
+                '''
+            }
+        }
+        stage('Push Image to Nexus') {
+            steps {
+                echo 'Pushing Docker image to Nexus...'
+                withCredentials([usernamePassword(credentialsId: "${NEXUS_CREDENTIALS_ID}", usernameVariable: 'NEXUS_USER', passwordVariable: 'NEXUS_PASS')]) {
+                    sh '''
+                        echo ${NEXUS_PASS} | docker login ${NEXUS_URL} -u ${NEXUS_USER} --password-stdin
+                        docker push ${NEXUS_URL}/${IMAGE_NAME}:${IMAGE_TAG}
+                    '''
+                }
+            }
+        } 
+        stage('Deploy to Docker Swarm') {
+            steps {
+                echo 'Deploying to Docker Swarm...'
+                withCredentials([sshUserPrivateKey(credentialsId: "${SSH_CREDENTIALS_ID}", keyFileVariable: 'PK')]) {
+                    sh '''
+                        ssh -i $PK -o "UserKnownHostsFile=/dev/null" -o "StrictHostKeyChecking=no" ${DOCKER_SWARM_MANAGER} "
+                        docker service update --image ${NEXUS_URL}/${IMAGE_NAME}:${IMAGE_TAG} ${IMAGE_NAME} ||
+                        docker service create --name ${IMAGE_NAME} --replicas 3 ${NEXUS_URL}/${IMAGE_NAME}:${IMAGE_TAG}"
+                    '''
+                }
+            }
+        }
+    }
+    post {
+        always {
+        }
+        success {
+        }
+        failure {
+            echo 'This will run only if failed'
+            mail to: 'michael.zhang@mclarens.co.nz',
+                 subject: "Failed pipeline: ${currentBuild.fullDisplayName}",
+                 body: "Something is wrong with ${env.BUILD_URL}"
+        }
+    }
+}