Deploy the frps helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a Helm chart, specifically the frps (Fast Reverse Proxy Server) Helm chart on the Digital Ocean Kubernetes Service (DOKS), we'll perform a few steps using Pulumi:

1. We need to create a Kubernetes cluster on Digital Ocean.
2. Then, we'll use the Helm chart resource to deploy frps onto the cluster we just created.

First, we'll set up a new project with Pulumi and write a TypeScript program to define the infrastructure. Pulumi works with configuration files and TypeScript code to set up and manage resources like Kubernetes clusters and Helm charts.

Before starting, make sure that you have Pulumi CLI installed and you are logged in. Also, ensure that you have access to your Digital Ocean account and its token is set up in Pulumi's configuration for creation of the Kubernetes cluster.

Below is the TypeScript program that sets up a DOKS cluster and then deploys the Helm chart:

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

// Create a Kubernetes cluster on Digital Ocean
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc3", // Choose the region that is closest to you or your users.
    version: "latest", // Use the latest available version for Kubernetes on DOKS.
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb", // This is the size of the Droplet (Digital Ocean's term for VM).
        nodeCount: 2, // This creates 2 nodes in the cluster.
    },
});

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

// Setup the Kubernetes provider to use the generated kubeconfig from our cluster.
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: kubeconfig,
});

// Deploy the frps Helm chart to the Kubernetes cluster
const frpsChart = new kubernetes.helm.v3.Chart("frps", {
    chart: "frps", // The name of the chart. Make sure 'frps' is available in your chosen Helm repo.
    version: "0.34.3", // Set the version of the chart you want to deploy.
    namespace: "default", // Deploy the chart in the default namespace.
}, { provider: k8sProvider });

// Export the external IP to access the frps service
export const frpsServiceIP = frpsChart.getResourceProperty("v1/Service", "frps", "status")
    .apply(status => status.loadBalancer.ingress[0].ip);
```

### Explanation:

- We import the necessary Pulumi packages for Digital Ocean (`@pulumi/digitalocean`) and Kubernetes (`@pulumi/kubernetes`).
- We then create a new Kubernetes cluster in the Digital Ocean cloud using `digitalocean.KubernetesCluster`. We define the region, Kubernetes version, and size and count of nodes in the node pool. You would typically choose the region closest to your users and select the size and number of nodes based on your application's capacity needs.
- We export the kubeconfig of the cluster, which allows you to interact with the cluster using tools like `kubectl` and is necessary for Pulumi to deploy resources onto the cluster.
- Next, we set up a Kubernetes provider instance configured with the kubeconfig. This tells Pulumi to deploy subsequent resources (like our Helm chart) to this specific Kubernetes cluster.
- We deploy the Helm chart for `frps` using the `kubernetes.helm.v3.Chart` resource, specifying the chart name, version, and namespace. Use the appropriate chart version for `frps` found in your Helm repository.
- Finally, we export the external IP address for the `frps` service, which is provisioned by Digital Ocean's Load Balancer. This IP is used to access your `frps` service from outside the cluster.

Please make sure that the `frps` chart name and version specified in the program match the actual names and versions available in the Helm repository that you are using. If `frps` is part of a custom repository, you may need to add that Helm repository before running this Pulumi program, or specify `repo` options within the Chart resource.

This program can be executed by running `pulumi up`. Once Pulumi has successfully run the code, you will get an output of the external IP address for the frps service that you can use to interact with your reverse proxy server.