Deploy the tyk-stack helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the tyk-stack Helm chart on Digital Ocean Kubernetes Service (DOKS), you'll need to perform the following steps using Pulumi:

1. **Create a DigitalOcean Kubernetes Cluster:** You'll start by defining a Kubernetes cluster in DigitalOcean. A cluster is a set of nodes that run containerized applications. DigitalOcean simplifies the process by managing the infrastructure for you.

2. **Install the Helm Chart:** Once the cluster is running, you'll use the `helm.sh/v3.Chart` resource to deploy the tyk-stack Helm chart. Helm helps you manage Kubernetes applications — Helm Charts help you define, install, and upgrade even the most complex Kubernetes applications.

Below is a Pulumi program in TypeScript to accomplish this task:

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

// Step 1: Create a DigitalOcean Kubernetes Cluster
const cluster = new digitalocean.KubernetesCluster("tyk-k8s-cluster", {
    region: digitalocean.Regions.NYC1,
    version: "latest",
    nodePool: {
        name: "worker-pool",
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB,
        nodeCount: 2,
        tags: ["tyk-k8s"],
    },
    tags: ["tyk-k8s"],
});

// Export the clusters' kubeconfig
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Step 2: Deploy tyk-stack using Helm
const tykHelmChart = new k8s.helm.v3.Chart("tyk", {
    // You may want to replace the chart property with the actual repository of tyk-stack
    // Use `fetchOpts` to specify the Helm repository if needed.
    chart: "tyk-stack",
    // Replace "tyk" with the correct namespace if tyk-stack should be installed in
    // a different namespace
    namespace: "tyk",
    // Set the values for the Helm chart as needed
    values: {
        // ... include any required chart values here
    },
}, { provider: new k8s.Provider("k8s-provider", { kubeconfig: cluster.kubeConfigs[0].rawConfig }) });

// Export the URL to access the deployed tyk-stack
export const tykServiceUrl = tykHelmChart.getResourceProperty("v1/Service", "tyk-headless", "status").apply(status => status.loadBalancer.ingress[0].ip);
```

Let's review the key components of the Pulumi Program:

- **DigitalOcean Kubernetes Cluster:** The `digitalocean.KubernetesCluster` resource is used to create a cluster in a specified region with a defined node pool. Here, we are creating a cluster called `tyk-k8s-cluster` in the NYC1 region with a node pool of two 2vCPU/2GB droplets.

- **Kubernetes Provider:** The Pulumi Kubernetes provider uses the kubeconfig generated by the DigitalOcean cluster to interact with the Kubernetes cluster. In this case, we are creating it with the alias `k8s-provider`.

- **Helm Chart for tyk-stack:** The `k8s.helm.v3.Chart` resource is utilized to deploy the tyk-stack Helm chart to the Kubernetes cluster. You would typically need to specify the chart's repository URL and any necessary values that configure tyk-stack according to your needs.

- **Exports:** Throughout the code, there are export statements. These make it easy to interact with the cluster and the service once deployed. For example, the `kubeconfig` export allows you to use `kubectl` to manage the Kubernetes cluster easily, and the `tykServiceUrl` export will provide you the URL to access the tyk-stack once it's deployed and load balancer is set up.

This Pulumi program needs to be in a file with a `.ts` extension and in a directory with the Pulumi project setup (usually initiated by running `pulumi new <template>` command). Once your Pulumi program is ready, you can deploy it by running `pulumi up` in your terminal, which will provision the resources as defined.

Remember to review and understand each portion of the program and ensure that you have the correct chart details and configuration values for the tyk-stack Helm chart as required for your use case.