How do I create a default URL Map for a GCP load balancer?

In this guide, we will create a default URL Map for a Google Cloud Platform (GCP) load balancer using Pulumi. A URL Map is used to route requests to different backend services based on the URL path and hostname.

We will:

1. Define a backend service.
2. Create a URL Map that routes traffic to the backend service.

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

// Define a backend service
const backendService = new gcp.compute.BackendService("backend-service", {
    loadBalancingScheme: "EXTERNAL",
    protocol: "HTTP",
    backends: [],
});

// Create a URL Map
const urlMap = new gcp.compute.URLMap("url-map", {
    defaultService: backendService.selfLink,
    hostRules: [
        {
            hosts: ["*"],
            pathMatcher: "allpaths",
        },
    ],
    pathMatchers: [
        {
            name: "allpaths",
            defaultService: backendService.selfLink,
            pathRules: [
                {
                    paths: ["/*"],
                    service: backendService.selfLink,
                },
            ],
        },
    ],
});

Key Points

• Backend Service: A service to handle incoming traffic, defined using gcp.compute.BackendService.
• URL Map: Routes traffic to the backend service based on URL paths and hostnames, defined using gcp.compute.URLMap.
• Host Rules: Specifies the hostnames and path matchers for routing.
• Path Matchers: Defines how URL paths are matched to backend services.

Summary

We created a default URL Map for a GCP load balancer by defining a backend service and configuring the URL Map to route all traffic to this backend service. This setup helps in managing and routing incoming traffic to appropriate backend services based on URL patterns.