Deploy the postgresql-persistent helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `postgresql-persistent` Helm chart on the Digital Ocean Kubernetes Service using Pulumi, you will need to follow these steps:

1. **Set up the Digital Ocean Kubernetes Cluster**: Use Pulumi's Digital Ocean provider to create a Kubernetes cluster in your desired region.

2. **Deploy the Helm Chart to the Cluster**: With the Kubernetes cluster in place, you can use Pulumi's Kubernetes provider to deploy the `postgresql-persistent` Helm chart to your cluster.

Below is a detailed program written in TypeScript that outlines these steps:

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

// Step 1: Create a Digital Ocean Kubernetes cluster.
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    region: "nyc1", // Choose the region that best suits your needs
    version: "1.23.5-do.0", // Specify the Kubernetes version
    nodePool: {
        name: "default",
        size: "s-1vcpu-2gb", // You can select a different size based on your needs
        nodeCount: 2, // Number of nodes you desire in the node pool
    },
});

// Export the cluster's kubeconfig.
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Step 2: Deploy the `postgresql-persistent` Helm chart using the new cluster's kubeconfig.
const postgresChart = new k8s.helm.v3.Chart("postgresql-persistent", {
    chart: "postgresql",
    version: "10.3.11", // You will have to specify the chart version you want to deploy
    fetchOpts: {
        repo: "https://charts.bitnami.com/bitnami", // This is the repository where the Helm chart is located
    },
    values: {
        // Here you can put the values you want to override - for example:
        persistence: {
            size: "10Gi", // Size of the persistent volume
        },
        // Define more custom values for your postgresql deployment if needed
    },
}, {
    provider: new k8s.Provider("k8s-provider", {
        kubeconfig: cluster.kubeConfigs[0].rawConfig,
    }),
});

// Export the endpoint to access your Postgres instance
export const postgresEndpoint = postgresChart.getResourceProperty("v1/Service", "postgresql-persistent-postgresql", "status").apply(status => status.loadBalancer.ingress[0].ip);
```

### Explanation:

- The `digitalocean.KubernetesCluster` is the Pulumi resource used to create a cluster in Digital Ocean. We define the region, Kubernetes version, number of nodes, and droplet size in the cluster configuration.

- The `new k8s.Provider` creates an instance that allows Pulumi to interact with the Kubernetes cluster. We pass the `kubeconfig` of the newly created Digital Ocean Kubernetes cluster to this provider, which is what allows the subsequent resources to be deployed to that cluster.

- The `new k8s.helm.v3.Chart` resource deploys the PostgreSQL Helm chart from the specified Helm repository with the version and configuration values you require.

- We export two values at the end of the program: The `kubeconfig`, which you can use to interact with your Kubernetes cluster using `kubectl` or other Kubernetes tools, and the `postgresEndpoint`, which is the IP address you can use to access your PostgreSQL service from outside the Kubernetes cluster.

You can run the above program using Pulumi by saving it to a file (for example, `index.ts`). Ensure you have Pulumi installed and configured to access Digital Ocean with your token. Then execute `pulumi up` to create the resources. Pulumi will provide you with a detailed preview of the resources that will