How to retrieve VPC subnet ID and name with Pulumi?

Question

Pulumi · Accepted Answer

You can retrieve VPC subnet information using Pulumi's resource classes that interact with AWS networking infrastructure.

Below is a Pulumi program that retrieves a list of all subnets in a specified VPC. This is done using the aws.ec2.getSubnetIds function, which returns a list of all subnet IDs associated with a VPC. It then uses aws.ec2.getSubnet to get details about each individual subnet, like its ID and name (provided it was given a name via tags).

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

// Specify the ID of your VPC
let vpcId = "<your-vpc-id>";

// Get a list of subnet IDs associated with the provided VPC ID
let vpcSubnetIds = aws.ec2.getSubnetIds({ vpcId: vpcId });

// Log each subnet ID and name
vpcSubnetIds.ids.then(ids => {
    ids.forEach(id => {
        let subnet = aws.ec2.getSubnet({ id: id });
        subnet.then(s => console.log(`ID: ${s.id}, Name: ${s.tags!["Name"]}`));
    });
});

Make sure to replace "<your-vpc-id>" with the actual ID of your VPC.

Note that the subnet's name comes from the subnet's tags, specifically a tag named "Name". If a subnet does not have a "Name" tag, it is possible that s.tags!["Name"] could return undefined.

This program should output the ID and name of each subnet within the specified VPC.

Pulumi Documentation Reference