Deploy the postgres-cluster helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy a PostgreSQL cluster using a Helm chart on Linode Kubernetes Engine, you would need to perform a few steps which involve setting up the Kubernetes cluster, installing Helm, and then deploying the PostgreSQL Helm chart.

In this program, we're using the Pulumi Kubernetes provider to interact with Kubernetes and Helm. The `kubernetes.helm.v3.Chart` resource is used to deploy a Helm chart. To use a Helm chart, you'd typically specify which repository the chart is from, the name of the chart, and any configurations specific to your deployment.

In this example, you would replace `REPO_URL` with the URL of the Helm chart repository that contains your `postgres-cluster` chart, and `CHART_VERSION` with the version of the chart you want to deploy. The `values` property is where you can provide a custom configuration for your PostgreSQL cluster, such as usernames, passwords, and other settings.

Below is the Pulumi TypeScript program that deploys a PostgreSQL cluster using a Helm chart:

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

// Example of deploying a PostgreSQL Helm chart on Linode Kubernetes Engine using Pulumi.

// Step 1: Initialize a new Pulumi program.
// Assumes Linode Kubernetes cluster kubeconfig is already set up.
const name = "postgres-cluster";

// Step 2: Deploy the PostgreSQL cluster using a Helm chart.
const postgresCluster = new k8s.helm.v3.Chart(name, {
  // Replace with your specific Helm chart repository URL.
  repo: "REPO_URL",
  chart: "postgres-cluster",
  // Replace with the version of the chart you want to install.
  version: "CHART_VERSION",
  // You can provide custom values to the Helm chart through the 'values' property.
  // For example, set custom database usernames, passwords, etc.
  values: {
    // Replace the below with your required specifications.
    postgresUser: "myuser",
    postgresPassword: "mypassword",
    postgresDatabase: "mydatabase",
  },
});

// Step 3: Export the service endpoint of the PostgreSQL cluster.
export const postgresEndpoint = postgresCluster.getResourceProperty(
  "v1/Service", name, "status"
);

```

**Explanation:**

1. We import the Pulumi Kubernetes library which contains the types and functions for interacting with Kubernetes resources in a Pulumi program.
2. We declare a Helm chart resource for PostgreSQL. We set the chart's `repo`, `name`, and `values`.
3. The `values` field is a JavaScript object that corresponds to the `values.yaml` you would normally fill out for Helm chart installations. You can customize it with the values specific to your PostgreSQL deployment.

Remember, to run this code, you'll need to have Pulumi installed and the Linode Kubernetes cluster kubeconfig correctly set up on your local machine. Once the program is run with `pulumi up`, it will deploy the PostgreSQL Helm chart to your Linode Kubernetes cluster.

To proceed with using this program, you would need to replace the placeholder strings like `REPO_URL` and `CHART_VERSION` with actual values that correspond to the Helm chart you wish to deploy. Additionally, customize the `values` section to match the Postgres cluster's configuration requirements.

Ensure that the repository containing the PostgreSQL chart is accessible from your Kubernetes cluster and that you're pointing to the correct Helm chart name and version that represent the PostgreSQL cluster setup you need.