Deploy the libretime helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the LibreTime Helm chart on DigitalOcean Kubernetes Service using Pulumi, we’ll go through a multi-step process. Here's an outline of the steps we'll follow:

1. Set up a new DigitalOcean Kubernetes (DOKS) cluster.
2. Configure the Kubeconfig to point at the new DOKS cluster.
3. Use the Helm Chart resource to deploy LibreTime on the DOKS cluster.

For deploying a Helm chart, Pulumi has the `helm.sh/v3.Chart` resource ([docs](https://www.pulumi.com/registry/packages/kubernetes/api-docs/helm.sh/v3/chart/)), which allows you to deploy charts to a Kubernetes cluster. To create the DOKS cluster, we'll use the `digitalocean.KubernetesCluster` resource ([docs](https://www.pulumi.com/registry/packages/digitalocean/api-docs/kubernetescluster/)).

First, you’ll need to install the Pulumi CLI and set up your DigitalOcean token. Instructions can be found on the Pulumi website, but in summary:

- Install Pulumi: https://www.pulumi.com/docs/get-started/install/
- Configure the DigitalOcean provider: https://www.pulumi.com/docs/intro/cloud-providers/digitalocean/setup/

Assuming that you've set up Pulumi and have the necessary permissions on DigitalOcean, here's the TypeScript program that deploys a LibreTime Helm chart onto a DOKS cluster:

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

// Step 1: Create a DigitalOcean Kubernetes cluster.
const cluster = new digitalocean.KubernetesCluster("libretime-cluster", {
    region: digitalocean.Regions.NYC1, // Choose the region appropriate for you
    version: "latest", // Use the latest available version of Kubernetes
    nodePool: {
        name: "default",
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB, // Choose the droplet size appropriate for you
        nodeCount: 2, // Specify the number of nodes
    },
});

// Step 2: Configure kubectl to connect to the new cluster.
const kubeConfig = cluster.kubeConfigs[0].rawConfig;

// Step 3: Deploy the LibreTime Helm chart using the Kubernetes provider.
const libretimeChart = new kubernetes.helm.v3.Chart("libretime-chart", {
    chart: "libretime",
    fetchOpts: {
        repo: "https://helm.example.com/", // Replace with the actual Helm repo containing the LibreTime chart
    },
    values: {
        // Define any specific configuration values here, or leave it empty.
    },
    // Ensure that the chart is installed into the created DOKS cluster
    provider: new kubernetes.Provider("k8s-provider", {
        kubeconfig: kubeConfig,
    }),
}, { dependsOn: [cluster] });

// Export the cluster's kubeconfig and LibreTime service endpoint
export const kubeconfig = kubeConfig;
export const libretimeEndpoint = libretimeChart.getResourceProperty("v1/Service", "libretime-service", "status").apply(status => status.loadBalancer.ingress[0].ip);
```

Here's what each part of the code does:

- We create a new instance of a DigitalOcean Kubernetes cluster with a specific region, Kubernetes version, droplet size, and node count. Change these specifications based on your requirements and resource availability.
- We get the `kubeConfig` from the newly created cluster, which allows us to interact with the cluster using kubectl commands.
- We deploy the LibreTime Helm chart. You would need to replace the `repo` with the actual repository where the LibreTime helm chart is located. The `values` object allows you to specify any required LibreTime configuration you might need. This could be blank if the helm chart does not require any specific configuration or if you want to use the defaults.
- We create a Kubernetes provider instance that uses the `kubeConfig` of our newly created DigitalOcean Kubernetes cluster to ensure that Helm chart resources are deployed to the right place.
- We use a `dependsOn` option to ensure that the Helm chart is not attempted to be deployed before the cluster is up and running.
- We export the kubeconfig in case we need to connect to the cluster with the kubectl command-line tool.
- We also attempt to export the service endpoint. Please note that this will work only if the LibreTime Helm chart creates a Service with a LoadBalancer and an externally accessible IP address.

Make sure to replace `https://helm.example.com/` with the actual Helm repository that hosts the LibreTime chart, and add any necessary configuration in the `values` object before running the program.

After you save the above code in a file called `index.ts`, you can deploy the stack with the following Pulumi CLI commands:

```shell
pulumi up
```

This will initiate the deployment process. It will show you a preview of the resources that will be created and, upon confirmation, will proceed to apply the changes. When it's done, you will see the exported kubeconfig and possibly the IP endpoint for your LibreTime service.