How Do I Integrate AWS Amplify With an Elastic Load Balancer?

Introduction

This guide provides a step-by-step approach to integrating an AWS Amplify application with an Elastic Load Balancer (ELB) using Pulumi. AWS Amplify is a powerful service designed for building and deploying full-stack web applications, while an Elastic Load Balancer ensures the distribution of incoming traffic across multiple targets like EC2 instances, enhancing the availability and reliability of your application.

Step-by-Step Explanation

Create an AWS Amplify Application: Begin by setting up an AWS Amplify application. This will host your web application and manage its deployment.
Set Up Networking Infrastructure: Establish a Virtual Private Cloud (VPC), along with subnets and an internet gateway, to provide the necessary networking environment for the ELB.
Configure Security: Create a security group that permits HTTP and HTTPS traffic, ensuring that your ELB can communicate with the internet securely.
Create an Elastic Load Balancer (ELB): Deploy an ELB within the configured VPC. This will handle the distribution of incoming application traffic.
Set Up Target Group and Listener: Establish a target group that the ELB will forward traffic to, and configure a listener on the ELB to direct traffic to this target group.

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Create an AWS Amplify Application
const amplifyApp = new aws.amplify.App("amplifyApp", {
    name: "myAmplifyApp",
    repository: "https://github.com/my-repo/amplify-app",
    oauthToken: "your-oauth-token", // Replace with your OAuth token
    environmentVariables: {
        "AMPLIFY_MONOREPO_APP_ROOT": "packages/web",
    },
    buildSpec: `version: 1
    applications:
      - frontend:
          phases:
            preBuild:
              commands:
                - npm install
            build:
              commands:
                - npm run build
          artifacts:
            baseDirectory: build
            files:
              - '**/*'
          cache:
            paths:
              - node_modules/**/*`,
});

// Create a VPC for the ELB
const vpc = new aws.ec2.Vpc("vpc", {
    cidrBlock: "10.0.0.0/16",
});

// Create Subnets for the ELB
const subnet1 = new aws.ec2.Subnet("subnet1", {
    vpcId: vpc.id,
    cidrBlock: "10.0.1.0/24",
    availabilityZone: "us-west-2a",
});

const subnet2 = new aws.ec2.Subnet("subnet2", {
    vpcId: vpc.id,
    cidrBlock: "10.0.2.0/24",
    availabilityZone: "us-west-2b",
});

// Create an Internet Gateway for the VPC
const internetGateway = new aws.ec2.InternetGateway("internetGateway", {
    vpcId: vpc.id,
});

// Create a Route Table for the VPC
const routeTable = new aws.ec2.RouteTable("routeTable", {
    vpcId: vpc.id,
    routes: [
        {
            cidrBlock: "0.0.0.0/0",
            gatewayId: internetGateway.id,
        },
    ],
});

// Associate the Route Table with the Subnets
const routeTableAssociation1 = new aws.ec2.RouteTableAssociation("routeTableAssociation1", {
    subnetId: subnet1.id,
    routeTableId: routeTable.id,
});

const routeTableAssociation2 = new aws.ec2.RouteTableAssociation("routeTableAssociation2", {
    subnetId: subnet2.id,
    routeTableId: routeTable.id,
});

// Create a Security Group for the ELB
const securityGroup = new aws.ec2.SecurityGroup("securityGroup", {
    vpcId: vpc.id,
    description: "Allow HTTP and HTTPS traffic",
    ingress: [
        {
            protocol: "tcp",
            fromPort: 80,
            toPort: 80,
            cidrBlocks: ["0.0.0.0/0"],
        },
        {
            protocol: "tcp",
            fromPort: 443,
            toPort: 443,
            cidrBlocks: ["0.0.0.0/0"],
        },
    ],
    egress: [
        {
            protocol: "tcp",
            fromPort: 0,
            toPort: 0,
            cidrBlocks: ["0.0.0.0/0"],
        },
    ],
});

// Create an Elastic Load Balancer (ELB)
const loadBalancer = new aws.lb.LoadBalancer("loadBalancer", {
    internal: false,
    securityGroups: [securityGroup.id],
    subnets: [subnet1.id, subnet2.id],
});

// Create a Target Group for the ELB
const targetGroup = new aws.lb.TargetGroup("targetGroup", {
    port: 80,
    protocol: "HTTP",
    vpcId: vpc.id,
    targetType: "instance",
});

// Create a Listener for the ELB
const listener = new aws.lb.Listener("listener", {
    loadBalancerArn: loadBalancer.arn,
    port: 80,
    defaultActions: [
        {
            type: "forward",
            targetGroupArn: targetGroup.arn,
        },
    ],
});

// Output the DNS name of the ELB
export const loadBalancerDnsName = loadBalancer.dnsName;

Conclusion

In this guide, we have successfully integrated an AWS Amplify application with an Elastic Load Balancer using Pulumi. This setup not only ensures that your web application is highly available and scalable but also provides a robust infrastructure for handling incoming traffic effectively. By following the outlined steps, you can deploy a reliable and efficient web application infrastructure on AWS.

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