Using kubernetes mongodbcommunity.mongodb.com with networking.cfargotunnel.com

Question

Pulumi · Accepted Answer

When integrating a MongoDB instance managed by the `mongodbcommunity` Kubernetes operator with Cloudflare's Argo Tunnel for secure and fast networking, you typically need to achieve two main objectives:

1. Provision and manage a MongoDB instance within a Kubernetes cluster
2. Securely expose that MongoDB instance to the internet via Cloudflare's Argo Tunnel

For the first objective, you would usually use the community Kubernetes operator for MongoDB, which automates the deployment and management of MongoDB instances within a Kubernetes cluster.

For the second objective, you would deploy a Cloudflare Argo Tunnel within your Kubernetes cluster that connects to the MongoDB service. This requires Cloudflare's Argo Tunnel Kubernetes resources.

However, as of my knowledge cutoff in 2023, Pulumi does not have direct support for deploying resources managed by the `mongodbcommunity` Kubernetes operator or resources from `networking.cfargotunnel.com`. These kinds of resources are often deployed using Kubernetes manifests or custom resource definitions (CRD), and Pulumi can manage these resources via the Kubernetes provider, which enables Pulumi programs to read and write Kubernetes resources.

Below is an example TypeScript Pulumi program, which illustrates how you might deploy a MongoDB instance using Kubernetes resources. Note that you will need to have the MongoDB Kubernetes operator and Cloudflare Argo Tunnel operator already installed in your cluster, as Pulumi will only be managing the resources and assumes these operators are present:

```typescript
import * as k8s from "@pulumi/kubernetes";

// Create a MongoDB Custom Resource. This presumes the MongoDB Community Operator is
// already installed in the cluster. Replace the 'mongoInstance' object spec with
// the correct spec according to the MongoDB CRD provided by the operator.
const mongoInstance = new k8s.apiextensions.CustomResource("mongoInstance", {
    apiVersion: "mongodbcommunity.mongodb.com/v1",
    kind: "MongoDB",
    metadata: {
        // Ensure that the namespace matches the one where the MongoDB operator is installed
        namespace: "mongodb",
    },
    spec: {
        // This spec is illustrative; be sure to provide values appropriate for your configuration
        members: 3,
        type: "ReplicaSet",
        version: "4.2.6",
        security: {
            authentication: {
                modes: ["SCRAM"],
            },
        },
        users: [
            {
                name: "my-user",
                db: "admin",
                passwordSecretRef: {
                    name: "my-user-password",
                },
                roles: [
                    {
                        name: "readWrite",
                        db: "my-database",
                    },
                ],
            },
        ],
    },
});

// Create a Kubernetes Service for the MongoDB instance.
const mongoService = new k8s.core.v1.Service("mongoService", {
    metadata: {
        namespace: mongoInstance.metadata.namespace,
    },
    spec: {
        selector: {
            // Your MongoDB pods' labels go here
            "app": "mongodb",
        },
        ports: [
            {
                port: 27017,
                targetPort: 27017,
            },
        ],
        // Configure the service to be internal only
        type: "ClusterIP",
    },
});

// Presuming you have the Cloudflare Argo Tunnel operator installed in your cluster,
// you can now set up the Argo Tunnel to expose the MongoDB service securely. This
// would typically involve creating a new Custom Resource that the Argo Tunnel operator
// understands, similarly to the 'mongoInstance' resource we created above. Make sure
// to configure this with the right spec according to Cloudflare's CRD.

// For this step, consult Cloudflare's own documentation or CRD examples to create
// an appropriate resource definition that will create an Argo Tunnel for the MongoDB service.
// That resource would interact with `networking.cfargotunnel.com` (Cloudflare Argo Tunnel's API),
// and utilize your Cloudflare account configurations.

// Due to the lack of specific CRDs and configurations for Cloudflare's Argo Tunnel service, 
// no exact Pulumi code can be provided without those definitions. Once you have the CRD definitions,
// you can use `new k8s.apiextensions.CustomResource` similarly to other Kubernetes resources.

export const mongoClusterName = mongoInstance.metadata.name;
```

In this example, we:

1. Create a MongoDB instance using the community operator's custom resource definition (CRD). This code assumes you already have a `MongoDB` CRD installed in the cluster that matches the `apiVersion`: `"mongodbcommunity.mongodb.com/v1"`.

2. Deploy a Kubernetes `Service` to expose the MongoDB instances within the cluster.

3. Include a placeholder for setting up a Cloudflare Argo Tunnel as a custom resource. The actual implementation will depend on the CRD provided by Cloudflare, which needs to be installed into your Kubernetes cluster.

Please note that this example will not directly work without the actual `MongoDB` and Cloudflare Argo Tunnel CRD definitions. You will have to replace these with actual resource definitions from the MongoDB Community CRD and Cloudflare's CRDs once installed in your cluster.

Also, be aware that managing cloud resources and Kubernetes configurations generally requires understanding of Kubernetes concepts, cloud provider specifics, and how the Pulumi Kubernetes provider works.