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  2. Integrating Route 53 Resolver Rules with AWS Transit Gateway

How do I integrate Route 53 Resolver Rules with AWS Transit Gateway?

In this guide, we will integrate AWS Route 53 Resolver rules with an AWS Transit Gateway using Pulumi. This setup allows you to manage DNS queries across multiple VPCs connected via the Transit Gateway.

We will:

  1. Create a Transit Gateway.
  2. Create a Route 53 Resolver rule.
  3. Create a Transit Gateway attachment to associate the Resolver rule with the Transit Gateway.
import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";

// Create a Transit Gateway
const transitGateway = new aws.ec2transitgateway.TransitGateway("exampleTransitGateway", {
    description: "Example Transit Gateway",
    tags: {
        Name: "example-transit-gateway",
    },
});

// Create a Route 53 Resolver rule
const resolverRule = new aws.route53.ResolverRule("exampleResolverRule", {
    domainName: "example.com",
    ruleType: "FORWARD",
    targetIps: [{
        ip: "192.0.2.1",
        port: 53,
    }],
    resolverEndpointId: "rslvr-out-1234567890abcdef", // Replace with your resolver endpoint ID
    tags: {
        Name: "example-resolver-rule",
    },
});

// Create a Transit Gateway Attachment for the Resolver rule
const tgwAttachment = new aws.ec2transitgateway.VpcAttachment("exampleTgwAttachment", {
    subnetIds: ["subnet-12345678"], // Replace with your subnet IDs
    transitGatewayId: transitGateway.id,
    vpcId: "vpc-12345678", // Replace with your VPC ID
    tags: {
        Name: "example-tgw-attachment",
    },
});

// Export the Transit Gateway ID and Resolver Rule ID
export const transitGatewayId = transitGateway.id;
export const resolverRuleId = resolverRule.id;

Key Points:

  • Transit Gateway: A central hub to connect multiple VPCs and on-premises networks.
  • Route 53 Resolver Rule: Manages DNS queries and forwards them to specified IP addresses.
  • Transit Gateway Attachment: Links the Transit Gateway with the VPC containing the Route 53 Resolver.

Summary:

We created an AWS Transit Gateway, a Route 53 Resolver rule, and linked them using a Transit Gateway attachment. This setup allows DNS queries to be managed and routed efficiently across VPCs connected via the Transit Gateway.

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