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  2. Integrate AWS Amplify with Elastic Load Balancer

How do I integrate AWS Amplify with an Elastic Load Balancer?

In this guide, we will set up an AWS Amplify application and integrate it with an Elastic Load Balancer (ELB) using Pulumi. AWS Amplify is a service for building and deploying full-stack web applications, while ELB helps distribute incoming application traffic across multiple targets, such as EC2 instances, to ensure high availability and reliability.

The following Pulumi program will:

  1. Create an AWS Amplify application.
  2. Create an Elastic Load Balancer (ELB).
  3. Integrate the Amplify application with the ELB.
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;

Key Points:

  • We created an AWS Amplify application to host our web application.
  • We set up a VPC, subnets, and an internet gateway to provide networking for the ELB.
  • We created a security group to allow HTTP and HTTPS traffic to the ELB.
  • We created an Elastic Load Balancer (ELB) with a listener that forwards traffic to a target group.

Summary:

This Pulumi program demonstrates how to set up an AWS Amplify application and integrate it with an Elastic Load Balancer (ELB). By following these steps, you can ensure that your web application is highly available and scalable.

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