Associating a Route Table With Multiple Subnets

Introduction

In this guide, we will demonstrate how to associate a Route Table with multiple Subnets using Pulumi in TypeScript. This is particularly useful when you need to manage routing configurations across multiple subnets within a VPC.

Step-by-Step Explanation

Step 1: Set up your Pulumi project

First, ensure you have a Pulumi project set up. If you don’t have one, you can create it using the following commands:

pulumi new aws-typescript

This will create a new Pulumi project with the necessary configuration for AWS in TypeScript.

Step 2: Define your VPC and Subnets

Next, define your VPC and the subnets you want to associate with the route table. Here is an example:

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

const vpc = new aws.ec2.Vpc("my-vpc", {
    cidrBlock: "10.0.0.0/16",
});

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",
});

Step 3: Create the Route Table

Create a route table that you will associate with the subnets:

const routeTable = new aws.ec2.RouteTable("routeTable", {
    vpcId: vpc.id,
});

Step 4: Associate the Route Table with Subnets

Finally, associate the route table with the subnets:

const routeTableAssociation1 = new aws.ec2.RouteTableAssociation("rta1", {
    subnetId: subnet1.id,
    routeTableId: routeTable.id,
});

const routeTableAssociation2 = new aws.ec2.RouteTableAssociation("rta2", {
    subnetId: subnet2.id,
    routeTableId: routeTable.id,
});

Summary

In this guide, we have shown how to associate a route table with multiple subnets using Pulumi in TypeScript. We created a VPC, defined subnets, created a route table, and then associated the route table with the subnets. This setup ensures that the routing configurations are applied consistently across the specified subnets.

Full Code Example

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

const vpc = new aws.ec2.Vpc("my-vpc", {
    cidrBlock: "10.0.0.0/16",
});

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",
});

const routeTable = new aws.ec2.RouteTable("routeTable", {
    vpcId: vpc.id,
});

const routeTableAssociation1 = new aws.ec2.RouteTableAssociation("rta1", {
    subnetId: subnet1.id,
    routeTableId: routeTable.id,
});

const routeTableAssociation2 = new aws.ec2.RouteTableAssociation("rta2", {
    subnetId: subnet2.id,
    routeTableId: routeTable.id,
});