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

Question

Pulumi · Accepted Answer

To deploy the `tyk-bootstrap` Helm chart on the Digital Ocean Kubernetes Service using Pulumi, we will go through the following steps:

1. **Create a Kubernetes cluster** on DigitalOcean: We will utilize Pulumi's DigitalOcean provider to provision a Kubernetes cluster.
2. **Install and configure the Helm chart** on the cluster: We will make use of Pulumi's Kubernetes provider to deploy the `tyk-bootstrap` Helm chart. The `helm.sh/v3.Chart` class allows us to deploy charts in a similar way to using Helm directly.

### Setting Up Pulumi Typescript Project

Make sure you have Pulumi CLI installed and you're authenticated with DigitalOcean. You can install Pulumi from [here](https://www.pulumi.com/docs/get-started/install/) and learn how to set your DigitalOcean token [here](https://www.pulumi.com/docs/intro/cloud-providers/digitalocean/setup/).

Once you have your environment ready, you will begin by creating a new Pulumi project:

```shell
pulumi new typescript
```

This command will create a new directory with a sample project in TypeScript and install necessary dependencies.

Now, let's write the TypeScript program to achieve our deployment.

### Pulumi Program Explanation

We will use the `@pulumi/digitalocean` package to create a Kubernetes cluster on DigitalOcean and the `@pulumi/kubernetes` package to deploy the Helm chart.

First, you will need to install these dependencies running:

```shell
npm install @pulumi/digitalocean @pulumi/kubernetes
```

The below TypeScript program will perform the following actions:
- Define a new Kubernetes cluster on DigitalOcean.
- Use the resulting kubeconfig to interact with the cluster.
- Deploy the `tyk-bootstrap` Helm chart using Pulumi's Kubernetes provider.

Now let's write the complete program:

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

// Define the Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1", // Choose the region that best suits you
    version: "latest", // Specify the Kubernetes version you want
    nodePool: {
        name: "default",
        size: "s-1vcpu-2gb", // Choose a node size that suits your requirement
        nodeCount: 2,
    },
});

// Export the Kubeconfig for the cluster
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Create a Pulumi Kubernetes provider using the cluster's kubeconfig
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});

// Define the Tyk Bootstrap Helm chart
const tykBootstrapChart = new kubernetes.helm.v3.Chart("tyk-bootstrap-chart", {
    chart: "tyk-bootstrap",
    version: "0.1.0", // Replace with the desired version of the chart
    fetchOpts: {
        repo: "https://helm.tyk.io/public/helm/charts/", // Tyk Helm chart repository
    },
    namespace: "tyk",
}, { provider: k8sProvider });

// Export the Helm chart status
export const helmChartStatus = tykBootstrapChart.status;
```

After writing your program, you can deploy it by running the following command:

```shell
pulumi up
```

The `pulumi up` command will show you a preview of the resources Pulumi will create. Confirm the operation and Pulumi will provision the DigitalOcean Kubernetes cluster and deploy the `tyk-bootstrap` Helm chart onto it.

### What to Look Out For

- **Kubernetes Version Compatibility**: Ensure that the Kubernetes version specified when creating the cluster is compatible with the Helm chart you wish to deploy.
- **Helm Chart Variables**: Some Helm charts require specific configuration values to be set for the deployment to succeed. Review the `tyk-bootstrap` Helm chart's documentation for required values.
- **Helm Chart Version**: Set the `version` field in `tykBootstrapChart` to the version of the Helm chart that you want to deploy.
- **DigitalOcean Node Size**: Make sure the node size (`size` in `nodePool`) fits the application requirements and budget.

Remember that Pulumi stores the state of your infrastructure from each `pulumi up`, which allows you to see what changes will be applied before making them. Enabling a safe iterative process as you build and maintain your infrastructure.