Cloudflare-First Networking as Code with Pulumi

Pablo Seibelt — Tue, 23 Jun 2026 00:00:00 +0000

Platform teams managing multi-cloud applications face a dangerous visibility gap. While origin infrastructure is tightly controlled, the edge configuration often drifts through manual console tweaks. DNS records point to stale origins, WAF rules are inconsistent across environments, and Zero Trust policies fail to keep pace with team changes. This edge drift leads to application exposure or routing failures that origin teams only notice after users report them.

As applications span multiple clouds, the edge often becomes the most consistent layer for enforcing security and traffic policies. The cost of waiting for a unified edge strategy is high. Every manual change is a potential security hole or a performance bottleneck that bypasses your standard CI/CD rigor.

What you’ll build

In this post, you will build a standardized Cloudflare edge baseline. You’ll use Pulumi to define:

DNS records to point to your multi-cloud origins.
WAF custom rules to block malicious traffic before it hits your network.
A Worker canary to handle edge logic and header validation.
Zero Trust Access policies to secure internal tools and origin access.

By the end, you will have a version-controlled edge that you can validate and deploy across any environment.

The Pulumi program

We’ll build a Pulumi program that sets up a complete edge environment. This approach ensures that your edge security and routing are always in sync with your application code.

Setting up the provider

First, ensure you have the @pulumi/cloudflare package installed and your credentials configured. The examples below are checked against @pulumi/cloudflare@6.15.0, the current v6 Pulumi Registry API at the time of writing.

npm install @pulumi/cloudflare@6.15.0
pulumi config set --secret cloudflare:apiToken "$CLOUDFLARE_API_TOKEN"

Defining the infrastructure

Here is the complete Pulumi program in TypeScript. If your zone already has a custom WAF ruleset for the same phase, import that ruleset or add the rule to your existing ruleset instead of creating another phase-level ruleset that may fail or conflict.

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

const accountId = "<your-cloudflare-account-id>";
const trustedAdminIp = "198.51.100.10";

const zone = new cloudflare.Zone("my-zone", {
 account: {
 id: accountId,
 },
 name: "example.com",
});

const www = new cloudflare.DnsRecord("www", {
 zoneId: zone.id,
 name: "www",
 content: "1.2.3.4",
 ttl: 1,
 type: "A",
 proxied: true,
});

const admin = new cloudflare.DnsRecord("admin", {
 zoneId: zone.id,
 name: "admin",
 content: "1.2.3.4",
 ttl: 1,
 type: "A",
 proxied: true,
});

const wafRule = new cloudflare.Ruleset("waf-rule", {
 zoneId: zone.id,
 name: "Block suspicious traffic",
 description: "Custom WAF rule to block specific patterns",
 kind: "zone",
 phase: "http_request_firewall_custom",
 rules: [{
 action: "block",
 expression: `(http.request.uri.path contains "/admin" and not ip.src in {${trustedAdminIp}})`,
 description: "Block unauthorized admin access",
 }],
});

const worker = new cloudflare.WorkersScript("canary-worker", {
 accountId: accountId,
 scriptName: "edge-canary",
 compatibilityDate: "2026-01-01",
 mainModule: "worker.js",
 content: `
 export default {
 async fetch(request) {
 return new Response("Edge Baseline Validated", {
 headers: { "x-edge-baseline": "active" },
 });
 },
 };
 `,
});

const workerRoute = new cloudflare.WorkersRoute("canary-route", {
 zoneId: zone.id,
 pattern: "www.example.com/*",
 script: worker.scriptName,
});

const adminGroup = new cloudflare.ZeroTrustAccessGroup("admin-group", {
 accountId: accountId,
 name: "Administrators",
 includes: [{
 email: {
 email: "admin@example.com",
 },
 }],
});

const accessApp = new cloudflare.ZeroTrustAccessApplication("internal-tool", {
 accountId: accountId,
 name: "Internal Admin Tool",
 domain: "admin.example.com",
 type: "self_hosted",
 policies: [{
 name: "Allow administrators",
 precedence: 1,
 decision: "allow",
 includes: [{
 group: {
 id: adminGroup.id,
 },
 }],
 }],
});

Validation

Once you run pulumi up, you can validate your edge baseline with these steps:

DNS check: Run dig www.example.com to confirm the record points to Cloudflare’s proxied IPs.
WAF test: Attempt to access www.example.com/admin from an unauthorized IP and verify you receive a 403 Forbidden response.
Worker canary: Use curl -I https://www.example.com and check for the x-edge-baseline: active header.
Access policy: Navigate to admin.example.com and verify you are redirected to the Cloudflare Access login page.