Deploy the spot-recommender helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the `spot-recommender` Helm chart on a Kubernetes cluster using Pulumi, you can use the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes provider. This resource allows you to deploy Helm charts into your Kubernetes cluster.

Before you begin, ensure that you have the following prerequisites:

1. Pulumi CLI installed.
2. Kubernetes cluster configured and the `kubeconfig` file is set up correctly.
3. Helm chart details such as the repository URL and the chart name ("spot-recommender").

Below is a Pulumi program in TypeScript that demonstrates how to deploy the `spot-recommender` Helm chart to your Kubernetes cluster:

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

// Define the Helm chart repository and chart details
const repo = "https://charts.example.com/";
const chartName = "spot-recommender";
const chartVersion = "1.0.0"; // Use the appropriate version number
const releaseName = "spot-recommender-release";
const namespace = "default"; // Use the namespace where you want to deploy the chart

// Create a new Helm Chart resource
const spotRecommenderChart = new kubernetes.helm.v3.Chart(releaseName, {
    namespace: namespace,
    chart: chartName,
    version: chartVersion,
    fetchOpts: {
        repo: repo
    },
    // If the chart requires any custom values, provide them here
    // values: {
    //     key: "value",
    // },
}, { provider: new kubernetes.Provider("k8s-provider") });

// Export the base URL where the application is hosted, which might be
// useful information depending on the Helm chart functionality.
export const appUrl = spotRecommenderChart.getResourceProperty("v1/Service", `${namespace}/${releaseName}`, "status").apply(status => {
    return status.loadBalancer.ingress[0].hostname || status.loadBalancer.ingress[0].ip;
});
```

In this code:

- We first import the necessary Pulumi Kubernetes package.
- Next, we provide the repository URL, the chart name, and the version for the Helm chart we wish to deploy. Be sure to obtain the correct values for these variables as per your Helm chart's specification.
- We then create an instance of `Chart` which represents the Helm chart you wish to deploy. We provide it with:
  - `namespace`: The Kubernetes namespace you wish to deploy the chart to. If not specified, it defaults to the "default" namespace.
  - `chart`: The name of the chart.
  - `version`: The version of the chart you wish to deploy.
  - `fetchOpts`: An object containing the repository URL from where to fetch the chart.
  - `values`: This is an optional property, commented out in the example, but if you have configuration values specific to `spot-recommender`, you'd uncomment this block and supply the values as key-value pairs.
- Finally, we export the URL where the application can be accessed, which is obtained from the properties of the `Service` resource.

Before you proceed with this Pulumi program, make sure to adjust the `repo`, `chartName`, and `chartVersion` variables with the correct details of the `spot-recommender` Helm chart that you wish to deploy. Also, specify the correct namespace where the Helm chart should be installed, if other than "default".

To deploy this Helm chart to your Kubernetes cluster, you need to run the following commands in the directory where this Pulumi program is located:

```sh
pulumi up
```

This command will prompt you to confirm the deployment after showing you a preview of the resources that will be created. Once confirmed, Pulumi will proceed to deploy the Helm chart to your Kubernetes cluster.

After the deployment is successful, you can check the exported `appUrl` for the URL where your application is accessible. Keep in mind that depending on the Helm chart and your Kubernetes services, the URL might not be immediately available as it might take some time for a LoadBalancer IP address or hostname to be assigned.