Deploy the podsecuritypolicy helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy a Helm chart on Digital Ocean Kubernetes Service using Pulumi, you need to set up a few things:

1. Create a Digital Ocean Kubernetes (DOKS) cluster, which is where you will deploy your Helm chart. We will be using the `digitalocean.KubernetesCluster` resource for this.
2. Once the cluster is in place, you will need to deploy your Helm chart to this cluster. We will use the `kubernetes.helm.v3.Chart` resource from the Kubernetes provider to achieve this.
3. To specify the use of a Helm chart for pod security policies (PSP), you will need to provide the name of the chart that handles PSP (e.g. `podsecuritypolicy`) and configure any necessary values that the chart requires.

Before running the below Pulumi program, make sure you have the Pulumi CLI installed and configured with your Digital Ocean token. Also, install kubectl, as it will be used by Pulumi to communicate with your Kubernetes clusters.

Now, let's go through the Pulumi code, which will complete these steps for you in TypeScript:

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

// Step 1: Create a new Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster('do-cluster', {
    region: 'nyc3',
    version: 'latest', // Specify the version or use 'latest'
    nodePool: {
        name: 'default',
        size: 's-2vcpu-4gb', // This is the smallest instance type
        nodeCount: 2,       // Number of nodes to deploy
    },
});

// Step 2: Set up a provider to interact with your new DOKS cluster
const k8sProvider = new k8s.Provider('k8s-provider', {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Step 3: Deploy the Helm chart for Pod Security Policies
const pspChart = new k8s.helm.v3.Chart('psp', {
    chart: 'podsecuritypolicy', // Name of the Helm chart. Replace it with the correct chart name
    // Here you may specify the Helm repo and version if it is not from the stable repository or if you want a specific version of the chart.
    values: {
        // Specify your Helm chart values here, for example:
        // global: { ... },
        // psp: { ... },
    },
}, { provider: k8sProvider });

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

// When executed, this program will create a Digital Ocean Kubernetes cluster, set up a provider to interact with it,
// and deploy the specified Helm chart using that provider. Since PSP (Pod Security Policies) are cluster-wide resources,
// you should ensure that the Helm chart you are referring to and its values set the policies correctly for your cluster's needs.
```

Here's a breakdown of the code:

- We import the necessary Pulumi modules for Digital Ocean and Kubernetes.
- We create a DOKS cluster in the region `nyc3` with the `latest` version of Kubernetes. We specify the size and count of the nodes in the node pool.
- We use the cluster configuration to create a new Kubernetes provider. This provider is necessary to manage resources on the cluster.
- We deploy a Helm chart using the `Chart` resource, where we specify the name of the Helm chart as `podsecuritypolicy`. We mention using `values` which should be filled with the configuration required by the specific Helm chart you are deploying.
- Finally, we export the `kubeconfig` of the cluster so that we can access the cluster using kubectl or any other Kubernetes tooling.

Please ensure to replace `"podsecuritypolicy"` with the actual chart name for pod security policies if it's different. Also, include the correct values for the properties of the Helm chart by replacing the comments in `values`.

Before executing the code with Pulumi CLI, ensure you've authenticated with Digital Ocean using `pulumi config set digitalocean:token [YOUR_DO_TOKEN]`.

After setting up your Pulumi stack, run:

```bash
pulumi up
```

This command will provision the resources as defined in the Pulumi program. It will create a Kubernetes cluster in Digital Ocean and deploy the Helm chart specified.