Sample NodeJS App for demo CI/CD using Jenkins to deploy on AWS ECS

Dockerfile

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+#Base Image node:12.18.4-alpine
+FROM node:12.18.4-alpine
+
+
+#Set working directory to /app
+WORKDIR /app
+
+
+#Set PATH /app/node_modules/.bin
+ENV PATH /app/node_modules/.bin:$PATH
+
+
+#Copy package.json in the image
+COPY package.json ./
+
+
+#Run npm install command
+RUN npm install
+
+
+#Copy the app
+COPY . ./
+
+EXPOSE 3000
+
+#Start the app
+CMD ["node", "./src/server.js"]

Jenkinsfile

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+pipeline {
+    agent any
+    environment {
+        AWS_ACCOUNT_ID="CHANGE_ME"
+        AWS_DEFAULT_REGION="CHANGE_ME" 
+	CLUSTER_NAME="CHANGE_ME"
+	SERVICE_NAME="CHANGE_ME"
+	TASK_DEFINITION_NAME="CHANGE_ME"
+	DESIRED_COUNT="CHANGE_ME"
+        IMAGE_REPO_NAME="CHANGE_ME"
+        IMAGE_TAG="${env.BUILD_ID}"
+        REPOSITORY_URI = "${AWS_ACCOUNT_ID}.dkr.ecr.${AWS_DEFAULT_REGION}.amazonaws.com/${IMAGE_REPO_NAME}"
+	registryCredential = "CHANGE_ME"
+    }
+
+    stages {
+
+    // Tests
+    stage('Unit Tests') {
+      steps{
+        script {
+          sh 'npm install'
+	  sh 'npm test -- --watchAll=false'
+        }
+      }
+    }
+
+    // Building Docker images
+    stage('Building image') {
+      steps{
+        script {
+          dockerImage = docker.build "${IMAGE_REPO_NAME}:${IMAGE_TAG}"
+        }
+      }
+    }
+
+    // Uploading Docker images into AWS ECR
+    stage('Pushing to ECR') {
+     steps{  
+         script {
+			docker.withRegistry("https://" + REPOSITORY_URI, "ecr:${AWS_DEFAULT_REGION}:" + registryCredential) {
+                    	dockerImage.push()
+                	}
+         }
+        }
+      }
+
+    stage('Deploy') {
+     steps{
+            withAWS(credentials: registryCredential, region: "${AWS_DEFAULT_REGION}") {
+                script {
+			sh './script.sh'
+                }
+            } 
+        }
+      }      
+
+    }
+}
+

README.md

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+Sample NOdeJS Appl
+------------------------
+
+## Overview
+
+CI/CD to test, build, push and deploy the NodeJS Dokerized app to AWS ECS using Jenkins Declarative Pipeline.
+
+## Tech Stack
+
+1. Github
+
+2. Jenkins
+
+3. ECR
+
+4. ECS
+
+
+## Pipeline Stages
+
+1. Tests
+
+2. Build an image
+
+3. Push the image to ECR
+
+4. Deploy the image
+
+
+## Notes

package.json

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+{
+  "name": "nodejs-template-1.0",
+  "version": "1.0.0",
+  "description": "nodejs-template-1.0",
+  "main": "server.js",
+  "scripts": {
+    "test": "jest ./src/test",
+    "start": "PORT=3000 node src/server.js",
+    "build": "npm run-script build"
+  },
+  "dependencies": {
+    "jest": "^26.6.3",
+    "supertest": "^6.0.1"
+  }
+}

script.sh

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+ROLE_ARN=`aws ecs describe-task-definition --task-definition "${TASK_DEFINITION_NAME}" --region "${AWS_DEFAULT_REGION}" | jq .taskDefinition.executionRoleArn`
+echo "ROLE_ARN= " $ROLE_ARN
+
+FAMILY=`aws ecs describe-task-definition --task-definition "${TASK_DEFINITION_NAME}" --region "${AWS_DEFAULT_REGION}" | jq .taskDefinition.family`
+echo "FAMILY= " $FAMILY
+
+NAME=`aws ecs describe-task-definition --task-definition "${TASK_DEFINITION_NAME}" --region "${AWS_DEFAULT_REGION}" | jq .taskDefinition.containerDefinitions[].name`
+echo "NAME= " $NAME
+
+sed -i "s#BUILD_NUMBER#$IMAGE_TAG#g" task-definition.json
+sed -i "s#REPOSITORY_URI#$REPOSITORY_URI#g" task-definition.json
+sed -i "s#ROLE_ARN#$ROLE_ARN#g" task-definition.json
+sed -i "s#FAMILY#$FAMILY#g" task-definition.json
+sed -i "s#NAME#$NAME#g" task-definition.json
+
+
+aws ecs register-task-definition --cli-input-json file://task-definition.json --region="${AWS_DEFAULT_REGION}"
+
+REVISION=`aws ecs describe-task-definition --task-definition "${TASK_DEFINITION_NAME}" --region "${AWS_DEFAULT_REGION}" | jq .taskDefinition.revision`
+echo "REVISION= " "${REVISION}"
+aws ecs update-service --cluster "${CLUSTER_NAME}" --service "${SERVICE_NAME}" --task-definition "${TASK_DEFINITION_NAME}":"${REVISION}" --desired-count "${DESIRED_COUNT}"

src/server.js

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+var http = require('http');
+
+var server = http.createServer(function(request, response) {
+
+    response.writeHead(200, {"Content-Type": "text/plain"});
+    response.end("Hello, Welcome to DevOps CI CD");
+
+});
+
+var port = 3000;
+server.listen(port);
+module.exports = server
+console.log("Server is available on Port:", port);

src/test/server.test.js

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+const app = require('../server'),
+request = require('supertest');
+
+
+
+describe('API Test',()=>{
+     afterEach(function (done) {
+        app.close(done)
+     });
+
+    it('Should return string in the GET Call',(done)=>{
+        request(app).get('/').expect('Content-Type',/text/).expect(200).end((error)=>{
+            if(error) throw done(error);
+            done();
+        });
+    });
+});

task-definition.json

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+{
+    "family": FAMILY,
+    "containerDefinitions": [
+        {
+            "image": "REPOSITORY_URI:BUILD_NUMBER",
+            "name": NAME,
+	    "essential": true,
+            "portMappings": [
+                {
+                    "containerPort": 3000,
+                    "hostPort": 3000
+                }
+            ]
+        }
+    ],
+    "cpu": "256",
+    "memory": "512",
+    "requiresCompatibilities": [
+             "FARGATE"
+    ],
+    "networkMode": "awsvpc",
+    "executionRoleArn": ROLE_ARN 
+}