1. Answers
  2. Using aws alb with s3-bucket

How Do I Set Up an AWS Application Load Balancer (ALB) With an S3 Bucket?

Introduction

Setting up an AWS Application Load Balancer (ALB) with an S3 bucket is a common requirement for hosting static websites and distributing traffic efficiently. This guide will walk you through the process of configuring an ALB with an S3 bucket using Pulumi in TypeScript. By the end, you’ll have a basic infrastructure where the ALB forwards traffic to a target group, and the S3 bucket serves static content.

Key Steps

  1. Create an S3 Bucket: Host your static website content.
  2. Create a Target Group: Route requests through the ALB to the S3 bucket.
  3. Create an ALB: Distribute incoming traffic to the target group.
  4. Create a Listener for the ALB: Manage incoming traffic and forward it to the target group.

Step-by-Step Explanation

  1. Create an S3 Bucket:

    • Set up an S3 bucket to store and serve static website content.

  2. Create a Target Group:

    • Define a target group for the ALB to route requests. As S3 buckets cannot be directly targeted, use a dummy target like a Lambda function or an EC2 instance.

  3. Create an ALB:

    • Deploy an ALB within a specific VPC and subnets.

  4. Create a Listener for the ALB:

    • Configure a listener to forward HTTP requests to the target group.

Pulumi Program in TypeScript

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

// Create an S3 bucket to store static content
const s3Bucket = new aws.s3.Bucket("my-bucket", {
    website: {
        indexDocument: "index.html",
        errorDocument: "error.html",
    },
});

// Create a VPC to deploy the ALB
const vpc = new aws.ec2.Vpc("my-vpc", {
    cidrBlock: "10.0.0.0/16",
    enableDnsSupport: true,
    enableDnsHostnames: true,
});

// Create subnets for the ALB
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 a security group for the ALB
const albSecurityGroup = new aws.ec2.SecurityGroup("alb-sg", {
    vpcId: vpc.id,
    description: "Allow HTTP traffic",
    ingress: [
        { protocol: "tcp", fromPort: 80, toPort: 80, cidrBlocks: ["0.0.0.0/0"] },
    ],
    egress: [
        { protocol: "tcp", fromPort: 0, toPort: 0, cidrBlocks: ["0.0.0.0/0"] },
    ],
});

// Create an ALB
const alb = new aws.lb.LoadBalancer("my-alb", {
    securityGroups: [albSecurityGroup.id],
    subnets: [subnet1.id, subnet2.id],
    loadBalancerType: "application",
});

// Create a target group (using a dummy target)
const targetGroup = new aws.lb.TargetGroup("my-target-group", {
    port: 80,
    protocol: "HTTP",
    vpcId: vpc.id,
    targetType: "instance", // Change this to "lambda" if using a Lambda function
});

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

// Export the S3 bucket URL and ALB DNS name
export const bucketUrl = pulumi.interpolate`http://${s3Bucket.websiteEndpoint}`;
export const albDnsName = alb.dnsName;

Conclusion

By following this guide, you have successfully set up an AWS Application Load Balancer with an S3 bucket using Pulumi in TypeScript. This setup allows you to host static content efficiently while managing traffic through an ALB. Remember to adjust the target group configuration to suit your specific use case, whether using an EC2 instance or a Lambda function.

Deploy this code

Want to deploy this code? Sign up for a free Pulumi account to deploy in a few clicks.

Sign up

New to Pulumi?

Want to deploy this code? Sign up with Pulumi to deploy in a few clicks.

Sign up