Deploy the centrifugo helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the Centrifugo Helm chart on Digital Ocean's Kubernetes service using Pulumi, we'll perform the following steps:

1. Create a new Kubernetes cluster on Digital Ocean.
2. Deploy the Centrifugo Helm chart on that Kubernetes cluster.

Here's the breakdown of how you would do each step in TypeScript using Pulumi:

- Firstly, import the necessary Pulumi packages for interacting with Digital Ocean and the Kubernetes provider.
- Create a new Digital Ocean Kubernetes cluster by specifying necessary properties like the region, the size, and the number of nodes in the node pool.
- After the cluster is provisioned, we can get the kubeconfig file that will allow us to connect to our Kubernetes cluster.
- Configure the Kubernetes provider with this kubeconfig, so Pulumi knows how to deploy resources to your new cluster.
- Finally, use the `helm.v3.Chart` resource to deploy Centrifugo from its Helm chart to your cluster.

Below is a TypeScript program that accomplishes the above:

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

// Create a new Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("centrifugo-cluster", {
    region: "nyc3",
    version: "latest",
    nodePool: {
        size: "s-2vcpu-2gb",
        name: "default",
        nodeCount: 2,
    },
});

// Export the kubeconfig file so that we can use it to connect to the cluster with kubectl
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Configure the Kubernetes provider with the kubeconfig from the newly created cluster
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Deploy the Centrifugo Helm chart using the Pulumi Kubernetes provider
const centrifugoChart = new kubernetes.helm.v3.Chart("centrifugo", {
    chart: "centrifugo",
    version: "7.0.0", // Specify the version of Centrifugo chart you wish to deploy
    namespace: "default", // You can choose a different namespace or create one if you prefer
}, { provider: k8sProvider });

// Exports
// These exports help you to interact with your resources programmatically using Pulumi's stack outputs
export const clusterName = cluster.name;
export const centrifugoChartVersion = centrifugoChart.version;
```

This program uses the `@pulumi/digitalocean` package to provision a Kubernetes cluster on Digital Ocean and the `@pulumi/kubernetes` package to interact with the cluster and deploy the Centrifugo Helm chart.

To run this program, save it as `index.ts` in a new Pulumi project directory, then run `pulumi up` to create the resources. Note that you would need to have Pulumi installed, as well as have your Digital Ocean access token configured with Pulumi.

Once the deployment is complete, you'll see the Kubernetes cluster's name and the Helm chart version in the Pulumi stack's outputs. You can use `kubectl` with the exported kubeconfig to interact with your cluster from the local machine. To learn more about configuring `kubectl` and interacting with your cluster, you can refer to the Kubernetes [documentation](https://kubernetes.io/docs/tasks/tools/).

Remember to destroy the resources when you're done by running `pulumi destroy` to avoid incurring charges.