Using kubernetes argoproj.io with rabbitmq.com

Question

Pulumi · Accepted Answer

To use Kubernetes with `argoproj.io` (specifically, Argo CD for continuous deployment) and `rabbitmq.com` (specifically, RabbitMQ as a message broker), we will create a Pulumi program in TypeScript. The program will set up a Kubernetes cluster where we can deploy Argo CD, which in turn can manage a RabbitMQ instance in the cluster.

Here's a high-level overview of what we'll do:

1. **Create a Kubernetes Cluster**: We'll use the `digitalocean.KubernetesCluster` resource from the DigitalOcean provider to create a Kubernetes cluster. You could use any cloud provider that supports Kubernetes, but for this example, we're using DigitalOcean since it's simple and straightforward to set up.
   
2. **Deploy Argo CD**: Once we have a Kubernetes cluster, we'll deploy Argo CD to it. Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. It monitors a Git repository for manifests that need to be applied to the cluster and will ensure the state of the cluster matches the configuration in the repo.
   
3. **Set up RabbitMQ**: With Argo CD running, we can define RabbitMQ as a Kubernetes Deployment and Service in our Git repository. Argo CD will be responsible for deploying and maintaining the correct state of the RabbitMQ instance(s) as defined by the manifests.

Let's start with setting up a new DigitalOcean Kubernetes cluster using Pulumi.

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

const cluster = new digitalocean.KubernetesCluster("do-k8s-cluster", {
    region: digitalocean.Regions.NYC3,
    version: "latest", // or specify a specific version of Kubernetes
    nodePool: {
        name: "default-pool",
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB,
        nodeCount: 2, // desired number of nodes in the cluster
    },
});

// Export the Kubernetes cluster kubeconfig.
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
```

After you run `pulumi up` and the cluster is created, you can set up Argo CD in the following steps (not shown as code):

1. Clone the Argo CD manifest from its official repository.
2. Customize the manifest if necessary, for instance, to set resource limits or node selectors.
3. Apply the manifest using `kubectl` and the `kubeconfig` you obtained from the Pulumi stack export.

Next, we need to prepare the environment for RabbitMQ:

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

// Create a Kubernetes provider instance that uses our kubeconfig.
const k8sProvider = new k8s.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});

// For the actual RabbitMQ deployment, it is expected to be defined
// in a repository monitored by Argo CD. However, as an example,
// here is how you might define a RabbitMQ deployment and service using Pulumi.

const rabbitmqDeployment = new k8s.apps.v1.Deployment("rabbitmq-deployment", {
    // Deployment metadata and spec come here
}, { provider: k8sProvider });

const rabbitmqService = new k8s.core.v1.Service("rabbitmq-service", {
    // Service metadata and spec come here
}, { provider: k8sProvider });
```

Remember that for Argo CD to deploy RabbitMQ, you'll need to:

1. Add RabbitMQ Kubernetes manifests to a dedicated git repository.
2. Configure Argo CD to monitor the repository and path where RabbitMQ's manifests are stored.

You configure RabbitMQ using Kubernetes manifests, which might include:

- A `Deployment` to manage the RabbitMQ pods.
- A `Service` to expose RabbitMQ to other services within your cluster.
- Possibly a `PersistentVolumeClaim` if you need persistent storage for RabbitMQ data.

You would also need to install the `argoproj.io` components in your Kubernetes cluster, where the Argo CD service will interact with your repository to ensure the desired state of RabbitMQ is achieved.

Please note that full RabbitMQ and Argo CD installation can be quite complex and involve creating specific configurations tailored to your use case. This example demonstrates how you might start such a project using Pulumi. More detailed configurations for RabbitMQ and instructions on how to set up Argo CD can be found in their respective official documentation.