Deploy the databend-query helm chart on Kubernetes

Question

Pulumi · Accepted Answer

Deploying a Helm chart to a Kubernetes cluster is a common task that can be easily achieved using Pulumi's Kubernetes provider. Helm charts help define, install, and upgrade even the most complex Kubernetes applications. `databend-query` is such a Helm chart that can be deployed to a Kubernetes cluster for a cloud-native and performance-sensitive data warehouse.

Below is a program written in TypeScript that uses Pulumi to deploy the `databend-query` Helm chart to an existing Kubernetes cluster. The program assumes that you have already configured Pulumi with access to your Kubernetes cluster, either via a kubeconfig file or a cloud provider’s Kubernetes service.

First, you'll need to import the necessary Pulumi and Kubernetes packages. After that, you'll create a new Helm chart resource, specifying the `databend-query` chart and any required configuration options such as values, version, and namespace.

Here is the Pulumi program that demonstrates this:

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

// This is the name of the Kubernetes namespace where the Helm chart will be deployed.
// If this namespace does not exist, you'll need to create it using k8s.core.v1.Namespace or change it to an existing one.
const namespace = "default";

// Here we define the Helm chart deployment for databend-query.
const databendQueryChart = new k8s.helm.v3.Chart("databend-query", {
    // Assuming the Helm chart is available in a public Helm chart repository,
    // you'd specify the repo URL here, and also ensure your Helm CLI is configured to access this repository.
    repo: "databend-query-repository", // This is a placeholder. Replace with the actual Helm chart repo name.
    chart: "databend-query",
    version: "0.1.0", // Replace with the actual chart version you want to deploy.
    namespace: namespace,
    // Values here are the configurations that you want to override in the default chart values.
    // This might include things such as storage options, service type, resource limits, etc.
    // This is an empty object, so no overrides are applied. Update with actual values if needed.
    values: {
        // Provide specific configuration values here. An example might be:
        // replicaCount: 3,
    },
}, {
    // Dependency on namespace if it is created as part of the same Pulumi program, to ensure correct ordering.
    // If the namespace resource is called `namespaceResource`, you would include it as follows:
    // dependsOn: [namespaceResource]
});

// Export the Helm chart deployment's name
export const chartName = databendQueryChart.metadata.apply(metadata => metadata.name);
```

In the code block above:

- We first import the Pulumi Kubernetes library.
- We define the namespace to deploy the Helm chart to. Kubernetes namespaces are a way for you to divide cluster resources between multiple users.
- `databendQueryChart` is the instance of the Helm chart resource for our application. Replace the `repo` and `version` fields with the appropriate values for the `databend-query` chart from your Helm chart repository.
- The `values` field is a JavaScript object that allows you to override values in the Helm chart's `values.yaml`. The ones provided here are just placeholders, and you should replace them with configurations specific to your deployment needs.
- The 'dependsOn' option allows us to specify explicit dependencies on other resources (if there are any). If the namespace is not pre-existing and needs to be created in the Pulumi program, it should be specified as a dependency to ensure correct creation order.

Please make sure that `databend-query-repository` is replaced with the actual repository where the Helm chart is located and that the `version` reflects the desired version of the chart you wish to deploy.

After you set up the Pulumi program, running `pulumi up` will execute it, and Pulumi will handle the deployment of the `databend-query` chart to your Kubernetes cluster.

Remember to check the official documentation of the `databend-query` chart for any specific configuration required and update the `values` object in the code accordingly. This Pulumi program is the foundational step, and individual configurations will vary based on your exact requirements.