Deploy NodeJS REST API on ECS Fargate using AWS CodePipeline

#codepipeline #codebuild #ecs #aws

In this guide, we'll walk through Deploy NodeJS REST API on ECS Fargate using AWS CodePipeline.

=> Create nodejs app using express framework

Create folder and run npm init.

=> Will be using Express framework to deploy the Node.js-based REST API.

=> Create an index.js file and paste the code into the current directory

'use strict'

const express = require('express');
const client = require('prom-client');
// Create a Registry to register the metrics
const register = new client.Registry();
client.collectDefaultMetrics({ register });
const PORT = 8080;
const HOST = '0.0.0.0';

const app = express();

// Define the route for the root path ("/")
app.get('/', (req, res) => {
    const sentence = 'Welcome to the Automation world';

    // Send the sentence as the response
    res.json({ sentence });
});

app.get('/metrics', async(req, res) => {
    res.setHeader('Content-Type', register.contentType);
    res.send(await register.metrics());
});

app.get('/ping', (req, res) => {
    res.status(200).json({ message: "pong" })
});
app.get('/error', (req, res) => {
    // Simulating an internal server error (500)
    const error = new Error('Internal Server Error');
    res.status(500).json({ error: error.message });
});
app.listen(PORT, HOST);
console.log('running on http://${HOST}:${PORT}')

=> Add Dockerfile to build the nodejs app

FROM node:16.18

WORKDIR /usr/src/app

COPY . .

RUN npm ci --only=production

EXPOSE 8080

USER node

CMD ["node", "index.js"]

=> Run the 'docker build' command to create the Docker image.

docker build -t nodeapp:v1 .

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AWS CodeBuild Setup

Create Repository in AWS ECR
Setup Source Provider
Create service role

Creating ECR repository with name nodeapp
Configure the Source Provider and authenticate using the GitHub provider.(Authenticate by generating a personal access token in GitHub. Navigate to GitHub's Developer Settings to create the token)