Deploy the technitium-dnsserver helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the technitium-dnsserver Helm chart on your Kubernetes cluster, you'll be using the Pulumi Kubernetes provider, which enables you to manage Kubernetes resources including Helm charts.

For the task at hand, you will use the `kubernetes.helm.v3.Chart` resource, which represents a Helm chart in Pulumi's programming model. This resource can be used to deploy a Helm chart from a repository or a local path; in this case, we will use a chart available in a repository.

Let's start with the program block:

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

// Name of the Helm chart
const chartName = "technitium-dnsserver";

// Instantiate a Helm chart from an existing repository
const dnsServerChart = new k8s.helm.v3.Chart(chartName, {
    // The name of the chart in the repository
    chart: chartName,
    // The repository where the chart is located
    fetchOpts: {
        repo: "https://technitium.com/dns/download",
    },
    // The namespace where you want to deploy the chart
    namespace: "default",
    // Optional: specify the version of the chart
    // version: "0.1.2", // Uncomment and replace with the desired chart version
    // Optional: Customize the installation by specifying values
    // values: { key: "value" }, // Uncomment to provide any custom values
});

// Export the DNS server service IP
export const dnsServiceIp = dnsServerChart.getResourceProperty("v1/Service","default",`${chartName}-technitium-dnsserver`, "status").apply(status => status.loadBalancer.ingress[0].ip);
```

Here's an explanation of what is happening in the above TypeScript program:

- We're importing the Kubernetes package from Pulumi to use within our code.
- The `kubernetes.helm.v3.Chart` resource creates a Helm chart resource within the cluster. This abstraction allows you to deploy Helm charts in a declarative way.
- We're deploying the `technitium-dnsserver` Helm chart by specifying its name and the repository URL where the Helm chart is located.
- We set the `namespace` property to deploy the chart to a specific Kubernetes namespace. We use the default namespace for ease of use, but you may choose to create or specify a different namespace.
- Optional `version` and `values` fields can be provided. The `version` field is used to specify a specific chart version to deploy if you don't want to use the latest version. The `values` field can be used to provide custom values to the Helm chart, similar to using a `values.yaml` file with Helm.

Finally, we've defined an export named `dnsServiceIp` that uses a call to `dnsServerChart.getResourceProperty` to fetch the service IP after the deployment. Note that this line assumes that a `Service` resource with a specific name was created by the Helm chart, and that the service is exposed via a LoadBalancer.

If the `Service` is not of type `LoadBalancer` or if you need a different way to fetch the external access point for the DNS server, you'll need to adjust the export accordingly.

To run this program, you need to have Pulumi installed and configured with access to a Kubernetes cluster.

1. Save the code to a file named `index.ts`.
2. Run `pulumi up` in the command line from the directory containing your new `index.ts` file to deploy the Helm chart.

Remember to replace the placeholder repository URL and other optional configuration values to match the actual details from the Technitium DNS server Helm chart. If the chart is hosted in a private repository, you will need to provide authentication details in the `fetchOpts`.