Using kubernetes cilium.io with rabbitmq.com

Question

Pulumi · Accepted Answer

To facilitate communication between RabbitMQ and other services within your Kubernetes cluster while maintaining network security, we can look into using Cilium. Cilium is a CNI (Container Network Interface) for Kubernetes that provides networking and security by utilizing eBPF technologies. It can enforce network policies, load balance requests, and provide network visibility.

The following Pulumi program will guide you through setting up a Kubernetes cluster with Cilium CNI installed, and then deploying RabbitMQ on that cluster as an example of how you can leverage Pulumi to accomplish this task.

Note that Cilium typically requires a specific setup and configuration that's dependent on your underlying Kubernetes cluster provider. In this program, we'll create a generic Kubernetes cluster and then install Cilium. Please ensure to check Cilium's official documentation for any provider-specific requirements.

We'll use the following resources:
- A generic Kubernetes Cluster: where RabbitMQ and Cilium will be deployed.
- Cilium Installation: using a Helm chart which is a package containing all the resource definitions necessary to run an application, toolkit, or service inside of a Kubernetes cluster.
- RabbitMQ deployment: spec that defines the desired state for RabbitMQ instance running in the cluster.

Let's start with our Pulumi TypeScript program:

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

// Create a Kubernetes cluster using a managed Kubernetes provider.
// This example uses `example.Cluster`, but in a real scenario, you would use a specific
// cluster resource like `aws.eks.Cluster`, `gcp.container.Cluster`, or `azure-native.containerservice.ManagedCluster`.
const cluster = new example.Cluster("my-cluster");

// Get the kubeconfig from the cluster
const kubeconfig = cluster.kubeconfig;

// Use the kubeconfig to create a K8s Provider instance.
const provider = new k8s.Provider("provider", { kubeconfig });

// Install Cilium with Helm Chart
const ciliumChart = new k8s.helm.v3.Chart("cilium", {
    chart: "cilium",
    version: "1.9.1",
    namespace: "kube-system",
    fetchOpts:{
        repo: "https://helm.cilium.io/",
    },
}, { provider });

// Deploy RabbitMQ using a Kubernetes Deployment
const rabbitmqDeployment = new k8s.apps.v1.Deployment("rabbitmq-deployment", {
    metadata: { namespace: "default" },
    spec: {
        selector: { matchLabels: { app: "rabbitmq" } },
        replicas: 1,
        template: {
            metadata: { labels: { app: "rabbitmq" } },
            spec: {
                containers: [{
                    name: "rabbitmq",
                    image: "rabbitmq:3-management",
                    ports: [{ name: "http", containerPort: 15672 }],
                }],
            },
        },
    },
}, { provider });

// Export the Deployment Name
export const rabbitmqDeploymentName = rabbitmqDeployment.metadata.name;
```

This Pulumi program does the following:
- Initialises a managed Kubernetes cluster within your chosen cloud provider.
- Creates a new instance of the Pulumi Kubernetes provider using the kubeconfig that is generated by your Kubernetes cluster.
- Installs Cilium into the `kube-system` namespace using the corresponding Helm chart. The `Chart` resource in Pulumi allows you to manage Helm charts in a declarative way.
- Deploys RabbitMQ using a Deployment resource. This includes the specification for running the RabbitMQ container, opening the management port at 15672.
- Exports the name of the RabbitMQ Deployment as a stack output, allowing you to easily identify and use this resource name later in your Pulumi stack or CI/CD systems.

Keep in mind that you need to replace `example.Cluster` with an actual Kubernetes cluster resource from a Pulumi package specific to your cloud provider. This example uses a Helm chart for easy Cilium installation with default values, but you can customize the installation according to your requirements.

Please ensure you have the Pulumi CLI set up and the necessary provider's CLI (e.g., AWS CLI for EKS, Azure CLI for AKS, or gcloud CLI for GKE) for handling credentials and other configuration settings.

To apply this Pulumi program, save the code into a file named `Pulumi.<stack-name>.ts`, install the necessary dependencies with `npm install`, and then run `pulumi up` to create and deploy resources defined in the program.