Monitoring website uptime with Cloudflare Health Checks

Question

Pulumi · Accepted Answer

To monitor website uptime effectively, you can use Cloudflare's Health Checks feature to create rules that specify how and when to check the health of your website. Cloudflare's Health Checks allow you to automatically monitor the availability of your site from different geographic regions, and they can be configured to check at various intervals.

Below is a Pulumi program that creates a health check in Cloudflare. This health check will monitor your website's uptime by periodically sending a request to a specified path and then checking for a successful response.

This Pulumi program assumes that you have already set up your Cloudflare DNS and have a zone ID for your domain. You will need to replace `'your-zone-id-here'` with the actual zone ID of your Cloudflare account, and `'your-website.com'` with the domain you wish to monitor.

Let's go through the program:

1. **Importing Cloudflare Package**: We begin by importing the Cloudflare package from Pulumi's library.
2. **Creating Healthcheck Resource**: We create a `cloudflare.Healthcheck` resource which defines the properties of the health check. We specify the name of the check, the path to query (e.g., the root "/" would be the home page), the expected HTTP response code (e.g., "200"), the method to use (e.g., "GET"), and the zone ID it applies to. You can also define additional parameters such as headers, interval, and even the regions from which the checks should originate.
3. **Setting Up Exports**: After setting up the health check, we use `pulumi.export` to output the health check ID once it's created, which allows us to easily reference the health check or confirm it has been created.

Here is your detailed Pulumi TypeScript program:

```typescript
import * as pulumi from "@pulumi/pulumi";
import * as cloudflare from "@pulumi/cloudflare";

// Create a Cloudflare Health Check to monitor website uptime.
const websiteHealthcheck = new cloudflare.Healthcheck("websiteUptimeHealthcheck", {
    // Set the name for your health check. You can name it anything descriptive.
    name: "website-up-check",

// The zone ID of your domain in Cloudflare. Replace with your actual zone ID.
    zoneId: "your-zone-id-here",

// The path Cloudflare will request to check your site's health. '/' for the home page.
    path: "/",

// 'http' or 'https' depending on your website's configuration.
    type: "http",

// The method Cloudflare will use to check your site. It is typically "GET".
    method: "GET",
    
    // The expected HTTP response code to treat as healthy (e.g., "200").
    expectedCodes: ["200"],

// Configure the intervals and retries as needed.
    interval: 60, // in seconds
    retries: 3,

// You can specify regions from where the health check should originate.
    checkRegions: ["WNAM", "ENAM"], // North America West and East

// Optional setup for additional settings like timeout, headers, and more.
    // timeout: 5, // in seconds
    // headers: [{header: "User-Agent", values: ["Pulumi Uptime Check"]}],
    
    // Additional configurations can be set here as needed.
});

// Export the ID of the health check to confirm creation or for easy reference.
pulumi.export("healthcheckId", websiteHealthcheck.id);
```

This program will provision a Cloudflare Health Check that continuously monitors the uptime of your website. After running this Pulumi program, any changes to the configuration or state of the health check will be managed and versioned by Pulumi.

Please replace the placeholders with your actual zone ID and configure the health check properties according to your needs. Once you run this Pulumi program with `pulumi up`, it will automatically create the health check in Cloudflare, and you will be able to monitor the uptime of your website.