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

Question

Pulumi · Accepted Answer

To deploy a Postgresql-Backup Helm chart on the DigitalOcean Kubernetes Service using Pulumi, you will need to complete several steps:

1. Setup a Kubernetes cluster on DigitalOcean.
2. Install the Helm chart for Postgresql-Backup on the Kubernetes cluster.

We will write a Pulumi program in TypeScript that achieves both of these goals. First, we will instantiate a DigitalOcean Kubernetes cluster using the `digitalocean.KubernetesCluster` class from the DigitalOcean Pulumi provider. Then we will use the `kubernetes.helm.v3.Chart` class from the Kubernetes provider to deploy the Postgresql-Backup Helm chart onto the cluster that we created.

For this scenario, we'll need to have the DigitalOcean and Kubernetes Pulumi providers installed, which can be done using npm or yarn:

```bash
npm install @pulumi/digitalocean @pulumi/kubernetes
```

Next, here's the TypeScript program that deploys a Postgresql-Backup Helm chart on DigitalOcean Kubernetes Service:

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

// Create a DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster('do-cluster', {
    region: 'nyc3', // Set the region where the cluster will be located, pick one that suits you
    version: 'latest', // Use the latest version of Kubernetes
    nodePool: {
        name: 'default', // Name of the node pool
        size: 's-2vcpu-2gb', // Size of the Droplets (DigitalOcean VMs) used for the Kubernetes nodes
        nodeCount: 2, // Number of nodes in the node pool
    },
});

// Once the cluster is provisioned, we will use the kubeconfig it provides to interact with the cluster
// to deploy resources using Pulumi's Kubernetes provider.
const kubeconfig = cluster.kubeConfigs[0].rawConfig;

const k8sProvider = new k8s.Provider('k8s-provider', {
    kubeconfig: kubeconfig,
});

// Deploy the Postgresql-Backup Helm chart into our DigitalOcean Kubernetes cluster using the Helm provider.
const postgresqlBackupChart = new k8s.helm.v3.Chart('postgresql-backup', {
    chart: 'postgresql-backup', // The name of the chart, make sure it exists in the Helm repository you are using
    version: '1.0.0', // Set the specific chart version, you may need to change this accordingly
    namespace: 'default', // Specify the namespace where the chart will be installed
}, { provider: k8sProvider });

// Export the cluster name and the Kubernetes cluster endpoint to access the cluster externally if needed
export const clusterName = cluster.name;
export const clusterEndpoint = cluster.endpoint;
```

In the above program, we first define a new DigitalOcean Kubernetes cluster specific to the `nyc3` region with a node pool of two `s-2vcpu-2gb` droplets. Adjust these parameters based on your needs and preferences.

After creating the cluster, we retrieve the kubeconfig, which allows us to interact with our Kubernetes cluster using Pulumi's Kubernetes provider. We use this kubeconfig to create a `k8s.Provider` instance which is responsible for dispatching any K8s resource requests we define.

Finally, we deploy the `postgresql-backup` chart to the `default` namespace in the Kubernetes cluster. This is a placeholder name for the Helm chart, you should replace the `chart` and `version` property with the actual Helm chart details found from Helm's chart repository or your own custom Helm chart repository.

We also export the cluster's name and endpoint so that you can interact with your Kubernetes cluster once it's up and running. The `clusterEndpoint` is particularly useful if you want to set up CI/CD processes or simply want to access your cluster directly.

To apply this program, save it to a file (e.g., `index.ts`), set up your Pulumi stack (if you haven't done so), and run `pulumi up`. Ensure you've set the required DigitalOcean access token in the Pulumi configuration or as an environment variable for authentication.