Creating Managed NAT for GCP Private Network Instances

Introduction

In this guide, we will create a managed NAT (Network Address Translation) gateway for instances in a private network on Google Cloud Platform (GCP). This setup allows instances in a private network to access the internet while remaining inaccessible from the internet.

Step-by-Step Explanation

Step 1: Set Up the Network

First, we need to create a VPC (Virtual Private Cloud) network and a subnet within that network.

Step 2: Create a Cloud Router

Next, we create a Cloud Router, which is required for the NAT gateway.

Step 3: Create a NAT Gateway

Finally, we create the NAT gateway and associate it with the Cloud Router.

Summary

By following these steps, you will have a managed NAT gateway set up for instances in a private network on GCP. This allows the instances to access the internet securely.

Full Code Example

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

// Create a VPC network
const network = new gcp.compute.Network("network", {
    autoCreateSubnetworks: false,
});

// Create a subnet within the VPC network
const subnet = new gcp.compute.Subnetwork("subnet", {
    network: network.id,
    ipCidrRange: "10.0.0.0/24",
    region: "us-central1",
});

// Create a Cloud Router
const router = new gcp.compute.Router("router", {
    network: network.id,
    region: "us-central1",
});

// Create a NAT Gateway and associate it with the Cloud Router
const natGateway = new gcp.compute.RouterNat("nat-gateway", {
    router: router.name,
    region: "us-central1",
    natIpAllocateOption: "AUTO_ONLY",
    sourceSubnetworkIpRangesToNat: "ALL_SUBNETWORKS_ALL_IP_RANGES",
});

export const networkName = network.name;
export const subnetName = subnet.name;
export const routerName = router.name;
export const natGatewayName = natGateway.name;