Deploy the redisoperator helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the Redis operator Helm chart on a DigitalOcean Kubernetes cluster using Pulumi, you'll follow a sequence of steps which includes setting up the necessary prerequisites, defining resources in your Pulumi program, and deploying your stack.

The main resources in use here are `digitalocean.KubernetesCluster` from the DigitalOcean provider to create a Kubernetes cluster and `kubernetes.helm.v3.Chart` from the Kubernetes provider to deploy the Redis operator Helm chart.

First, ensure you've installed the Pulumi CLI and set up the DigitalOcean provider by providing the necessary tokens.

Next, we write a Pulumi program that performs the following actions:

1. Provisions a Kubernetes cluster on DigitalOcean.
2. Deploys the Redis operator Helm chart onto the cluster.

Below is a detailed TypeScript program that accomplishes this:

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

// Create a DigitalOcean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster("do-cluster", {
    // Specify the region for your cluster
    region: "nyc3",
    // Choose the version for your Kubernetes cluster
    version: "latest",
    // Define the node pool specification
    nodePool: {
        name: "default",
        size: "s-2vcpu-2gb",
        nodeCount: 2, // specify the number of nodes
    },
});

// Once the cluster is created, we can configure a Kubernetes provider that uses our new cluster's kubeconfig
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Deploy the Redis operator Helm chart using the Kubernetes provider
const redisOperatorChart = new kubernetes.helm.v3.Chart("redis-operator", {
    chart: "redis-operator",
    version: "x.y.z", // specify the chart version you wish to deploy
    // You can specify the chart repository by adding 'repo' property if it's not in the default Helm repo list
    // The `values` field is used to customize the Helm chart's default configuration
    // For the Redis operator, refer to the respective Helm chart's documentation for configurable values
    values: {
        // Custom values for the Redis operator
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig and the Redis operator's status
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;
export const redisOperatorStatus = redisOperatorChart.status;
```

Here's an explanation of what each part of the code does:

- The `digitalocean.KubernetesCluster` resource is used to provision a managed Kubernetes cluster on DigitalOcean. You need to specify the region, Kubernetes version, and details about the node pool, such as the size and count of nodes.

- Then, we create an instance of `kubernetes.Provider`, which allows us to interact with the newly created Kubernetes cluster using the cluster's kubeconfig.

- We define a `kubernetes.helm.v3.Chart` resource, which is used to deploy applications packaged as Helm charts. In this case, we're deploying the Redis operator. You need to specify the chart name and version. If the chart is not available in Helm's default repositories or you have a custom chart repository, you can also add the 'repo' property with the URL of the Helm chart repository.

- Finally, we export the kubeconfig, so you can interact with your cluster using `kubectl` or other Kubernetes tools, and the Redis operator chart status, which gives information about the deployment.

To run this Pulumi program, you would navigate to the directory containing the program and execute `pulumi up`. This will prompt Pulumi to perform the preview and then create the resources upon confirmation.

Remember to replace `x.y.z` with the actual version of the Redis operator Helm chart you wish to deploy, and fill in the `values` with the specific configurations you want for the Redis operator.

Ensure that you handle any sensitive data, such as API tokens, securely, preferably using Pulumi's secret management.