Deploy the copy-database helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the `copy-database` Helm chart on Kubernetes using Pulumi, you will need to use the `Chart` resource from the Pulumi Kubernetes provider. This resource allows you to deploy a Helm chart to a Kubernetes cluster. The chart could be from any Helm chart repository, or it could be one that you have created yourself.

Here's a step-by-step explanation of what you'll need to do in your Pulumi program:

1. **Import dependencies**: You'll need to import the relevant Pulumi Kubernetes library to be able to define Kubernetes resources.

2. **Create a Kubernetes Provider**: If you are targeting a Kubernetes cluster that is not the default (configured in your `kubeconfig`), you will create an instance of a `Provider` resource that points to the desired cluster.

3. **Deploy the Helm Chart**: Use the `Chart` resource to specify the Helm chart you want to deploy (`copy-database` in this case). Additionally, provide configuration details such as the chart version, any custom values to override the defaults, and the namespace for deployment.

4. **Export any required Outputs**: After deploying the Helm chart, you might want to export the status or any other outputs provided by the Helm chart.

Below is a TypeScript program that does just that. Please ensure you have Pulumi installed and configured with access to a Kubernetes cluster. Then, you can place the following program in a file (e.g., `index.ts`) and run it using `pulumi up`.

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

// Define the namespace where the Helm chart will be installed.
const namespace = new kubernetes.core.v1.Namespace("copy-database-ns", {
    metadata: { name: "copy-database-ns" },
});

// Deploy the 'copy-database' Helm chart.
const copyDatabaseChart = new kubernetes.helm.v3.Chart("copy-database", {
    chart: "copy-database",
    version: "1.0.0", // replace with the specific chart version you want to deploy
    namespace: namespace.metadata.name,
    // If the chart requires any custom values, define them here.
    values: {
        // custom values to override the chart defaults go here
    },
    // If the chart is in a custom repository, specify `repo` attribute here.
    fetchOpts: {
        repo: "http://charts.example.com/", // replace with the URL of the chart repo
    },
}, { provider: /* your Kubernetes provider if it's not the default */ });

// Export the status of the deployed Helm chart.
export const status = copyDatabaseChart.status;

// To see the exported output after the `pulumi up` command finishes, use:
// `pulumi stack output status`.
```

In this program:

- `@pulumi/pulumi` is a core Pulumi library for defining and managing resources,
- `@pulumi/kubernetes` is the Pulumi Kubernetes library, which provides the necessary abstractions to define Kubernetes resources in a Pulumi program,
- `kubernetes.core.v1.Namespace` is a Pulumi resource that creates a Kubernetes namespace,
- `kubernetes.helm.v3.Chart` is a Pulumi resource used to deploy a Helm chart to a Kubernetes cluster,
- `values` is an object where you specify any custom configurations for the Helm chart. These values override the defaults specified within the Helm chart itself,
- `fetchOpts` is an object where you can specify options for fetching the Helm chart, such as the repository URL,
- `export const status = copyDatabaseChart.status;` will allow you to view the status of the Helm chart after it has been deployed when you run `pulumi stack output status` in your CLI.

Remember to replace the `chart`, `version`, `repo`, and `values` fields in the code with the actual values for the `copy-database` Helm chart that you're trying to deploy. If your Kubernetes cluster is set up as the default in your `kubeconfig`, you do not need to specify a provider; otherwise, you'll need to configure one for the target cluster.