Deploy the api-graphql helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart to a Kubernetes cluster using Pulumi, you generally need two things in place:

1. A Kubernetes cluster to deploy to.
2. The Helm chart you want to deploy.

In this case, you're looking to deploy an "api-graphql" Helm chart. The deployment will be done on an existing Kubernetes cluster. Before you proceed with Pulumi, you should ensure that you have configured your Pulumi environment to connect to your Kubernetes cluster.

The Pulumi program below will use the `kubernetes.helm.v3.Chart` class to deploy a Helm chart. This class is a high-level resource that allows you to deploy Helm charts into a Kubernetes cluster.

Here's how the deployment process is structured:
1. Import the required Pulumi and Kubernetes packages.
2. Create a new Helm chart resource using the `new Chart()` constructor.
3. Specify the necessary parameters such as chart name, version, and values corresponding to your Helm chart's requirements.

Below is the TypeScript program that would deploy the "api-graphql" Helm chart to your Kubernetes cluster:

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

// Create a new Helm chart instance for the api-graphql chart.
const apiGraphqlChart = new k8s.helm.v3.Chart("api-graphql", {
    chart: "api-graphql", // The name of the chart.
    // If your chart is in a custom Helm repository, you need to add the 'repo' field:
    // repo: "http://my-helm-repo.org/charts",
    // You may also need to specify a chart version:
    // version: "1.2.3",
    // If you have custom values you'd like to override, specify them here.
    // For instance, if you need to set a property `image.tag`, the values might look like:
    // values: { image: { tag: "latest" } },
    // Namespace to deploy the chart into (default is 'default').
    namespace: "my-namespace",
});

// Export the name of the chart.
export const chartName = apiGraphqlChart.metadata.name;
```

Explanation of the code:
- We start by importing the Kubernetes package from Pulumi which provides us with the `Chart` class necessary for Helm operations.
- We instantiate a new Helm chart with `new k8s.helm.v3.Chart`, and we provide it with a name ("api-graphql" in this case).
- We pass an object to the Chart constructor that specifies various options according to the Helm chart you are deploying. The `chart` field is the name of the Helm chart. Optionally, you can specify the `repo` field if the chart is in a custom repository, the `version` field to pin to a particular version of the chart, and the `values` field for any custom values you want to overwrite in the Helm chart.
- By default, the Helm chart is deployed to the "default" namespace. If you wish to deploy it to a different namespace, you can do so by setting the `namespace` field.
- Finally, we export the name of the chart as an output from the Pulumi program, which can be useful for referencing the deployment in subsequent commands or scripts.

Before running this Pulumi program, ensure you have access to your Kubernetes cluster and the `api-graphql` chart is correctly configured to run in your cluster.

Please note, some Helm charts require you to provide custom configuration values. These values often have to be provided when the Chart resource is created, through the `values` property. This example assumes that no custom values were necessary, or that you would fill them in as needed.

Make sure to review and adjust the code to fit the specific details of the Helm chart you are deploying.