1. Answers
  2. Exposing RESTful APIs through AWS Elastic Load Balancer

How do I expose RESTful APIs through AWS Elastic Load Balancer?

In this guide, we will demonstrate how to expose RESTful APIs through an AWS Elastic Load Balancer using Pulumi. We will create an Elastic Load Balancer, set up a target group, and configure listener rules to route traffic to the target group.

Key Points

  • Create an AWS Elastic Load Balancer
  • Set up a target group for the load balancer
  • Configure listener rules to route traffic
import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

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

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

// Create a security group
const securityGroup = new aws.ec2.SecurityGroup("my-security-group", {
    vpcId: vpc.id,
    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 Elastic Load Balancer
const alb = new aws.lb.LoadBalancer("my-alb", {
    internal: false,
    securityGroups: [securityGroup.id],
    subnets: [subnet.id],
});

// Create a target group
const targetGroup = new aws.lb.TargetGroup("my-target-group", {
    port: 80,
    protocol: "HTTP",
    vpcId: vpc.id,
    targetType: "instance",
});

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

// Export the DNS name of the load balancer
export const albDnsName = alb.dnsName;

Summary

In this guide, we created a VPC, subnet, and security group. We then created an AWS Elastic Load Balancer and set up a target group. Finally, we configured a listener to route HTTP traffic to the target group. The DNS name of the load balancer is exported for use in accessing the RESTful APIs.

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