How to Retrieve VPC Subnet ID and Name With Pulumi?

Introduction

In this guide, we will demonstrate how to retrieve the VPC subnet ID and name using Pulumi. Pulumi is an infrastructure as code tool that allows you to define cloud resources using programming languages. We will use TypeScript for this example.

Step-by-Step Explanation

Step 1: Install Pulumi and AWS SDK

First, ensure you have Pulumi installed. You can install Pulumi using npm:

npm install -g pulumi

Next, install the Pulumi AWS SDK:

npm install @pulumi/aws

Step 2: Create a Pulumi Project

Create a new Pulumi project using the following command:

pulumi new aws-typescript

This will set up a new Pulumi project with the necessary configuration files.

Step 3: Write the Pulumi Program

Open the index.ts file in your project directory and add the following code to retrieve the VPC subnet ID and name:

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

// Retrieve the default VPC
const vpc = aws.ec2.getVpc({ default: true });

// Retrieve the subnets in the VPC
const subnets = aws.ec2.getSubnets({ vpcId: vpc.then(v => v.id) });

// Export the subnet IDs and names
export const subnetIds = subnets.then(s => s.ids);
export const subnetNames = subnets.then(s => s.tags.map(tag => tag.Name));

Step 4: Deploy the Pulumi Program

Run the following command to deploy the Pulumi program and retrieve the subnet IDs and names:

pulumi up

Pulumi will prompt you to confirm the deployment. Once confirmed, Pulumi will execute the program and display the subnet IDs and names.

Summary

In this guide, we demonstrated how to retrieve the VPC subnet ID and name using Pulumi and TypeScript. We installed Pulumi and the AWS SDK, created a new Pulumi project, wrote the Pulumi program to retrieve the subnet information, and deployed the program to get the results. Pulumi makes it easy to manage cloud resources using familiar programming languages.

Full Code Example

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

// Retrieve the default VPC
const vpc = aws.ec2.getVpc({ default: true });

// Retrieve the subnets in the VPC
const subnets = vpc.then(v => aws.ec2.getSubnets({ filters: [{ name: "vpc-id", values: [v.id] }] }));

// Export the subnet IDs and names
export const subnetIds = subnets.then(s => s.ids);
export const subnetNames = subnets.then(s => s.ids.map(id => aws.ec2.getSubnet({ id }).then(subnet => subnet.tags?.Name || "")));