Deploy the python-redis helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the `python-redis` Helm chart on Digital Ocean Kubernetes Service (DOKS), we need to follow these steps:

1. **Set up a Kubernetes cluster on Digital Ocean**: Define a DigitalOcean Kubernetes cluster with the necessary configuration.
2. **Install the Helm chart**: Use the Pulumi Kubernetes provider to deploy the Helm chart in the created Kubernetes cluster.

To begin, make sure you have the latest Pulumi CLI installed and Digital Ocean token configured appropriately in Pulumi. Also, install `@pulumi/digitalocean` and `@pulumi/kubernetes` packages using `npm` or `yarn`.

Here is a complete Pulumi TypeScript program that achieves this goal:

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

// Step 1: Create a Digital Ocean Kubernetes Service (DOKS) cluster
const cluster = new digitalocean.KubernetesCluster("py-redis-cluster", {
    region: digitalocean.Regions.NYC1, // You can choose another region if needed
    version: "latest", // Specify the desired Kubernetes version
    nodePool: {
        name: "default",
        size: digitalocean.DropletSlugs.DropletS2VCPU2GB, // Choose the VM size that fits your needs
        nodeCount: 2, // Set the desired number of nodes
    },
});

// Step 2: Deploy the 'python-redis' Helm chart into the DOKS cluster we created
// We'll use the 'kubernetes' provider to interact with the DOKS cluster
const kubeconfig = cluster.kubeConfigs[0].rawConfig;
const provider = new k8s.Provider("doks-provider", {
    kubeconfig,
});

// Ensure the 'python-redis' Helm chart is available on your chosen Helm repository
const pythonRedisChart = new k8s.helm.v3.Chart("python-redis-chart", {
    chart: "python-redis", // The name of the chart
    version: "x.y.z", // Specify the chart version you want to deploy
    // In the 'values' property, you can define configuration values for the Helm chart
    // You will need to refer to the specific Helm chart documentation for the configuration options
    values: {
        // Insert your configuration values here
    },
}, {
    provider: provider, // Specify the provider to deploy the resources into our DOKS cluster
});

// Export the cluster's kubeconfig and IP endpoint for easy access to your cluster
export const kubeconfigOutput = kubeconfig;
export const endpoint = cluster.endpoint;
```

Let's run through the main parts of this program:

- We first import the necessary Pulumi packages for DigitalOcean and Kubernetes so that we can interact with those services using Pulumi.
- We then create a DOKS cluster (represented by `digitalocean.KubernetesCluster`) with a specific region and node size. The `version` parameter is set to `latest`, so it automatically selects the latest available version of Kubernetes supported by DigitalOcean. You can explicitly set this to a version if needed.

- Next, we deploy the `python-redis` Helm chart on the cluster using `k8s.helm.v3.Chart`. Before you deploy the chart, make sure that it is available in your Helm repository and note the version you want to deploy. The `values` object is where you can pass configuration values that customize the chart to your needs. For instance, those could define the number of replicas, resource requests and limits, and other settings which are specific to the Python Redis application you are deploying.

- We provide the Kubernetes Provider with the kubeconfig of the newly created cluster, which allows Pulumi to perform operations on our DOKS cluster.
  
- Finally, we export the `kubeconfigOutput` and the `endpoint` of the Kubernetes cluster. The kubeconfig is used for connecting to the Kubernetes cluster with `kubectl` or other Kubernetes management tools, and the endpoint provides you with the direct access URL to your cluster's API server.

By running this program with `pulumi up`, the DOKS cluster will be provisioned and the `python-redis` Helm chart will be deployed into it. Make sure you have your DigitalOcean token set up in a Pulumi configuration or environment variable so Pulumi can authenticate with your DigitalOcean account.

Please replace the placeholders such as `x.y.z` for the chart version and insert the appropriate values according to the `python-redis` Helm chart documentation. If the chart is not in the default Helm repo, you may also need to specify the `repo` property in the `k8s.helm.v3.Chart` arguments.

Remember that real-world Pulumi programs will often use configuration values for sensitive information and for providing defaults that can be overridden at deployment time. This understanding ensures better security and flexibility in your infrastructure code.