Deploy the istio-egress-gateway helm chart on Digital Ocean Kubernetes Service

Question

Pulumi · Accepted Answer

To deploy the Istio Egress Gateway using a Helm chart on the Digital Ocean Kubernetes Service, you will need a Digital Ocean Kubernetes cluster and then use Pulumi's Helm chart support to deploy the Istio Egress Gateway chart to your cluster.

The overall steps are:

1. Create a Digital Ocean Kubernetes Cluster: We will define a Pulumi resource to create a new Kubernetes cluster on the Digital Ocean platform.

2. Deploy Istio Egress Gateway Helm Chart: After the cluster is provisioned and ready, we will use Pulumi's Helm Chart resource that allows you to deploy Helm charts in a Kubernetes cluster.

Below is a detailed, commented Pulumi program written in TypeScript to achieve these steps:

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

// Create a Digital Ocean Kubernetes cluster
const cluster = new digitalocean.KubernetesCluster('do-cluster', {
    region: 'nyc1',
    version: 'latest',
    nodePool: {
        name: 'default',
        size: 's-2vcpu-2gb',
        nodeCount: 3,
    },
});

// Export the Kubernetes cluster Kubeconfig
export const kubeconfig = cluster.kubeConfigs[0].rawConfig;

// Create a Kubernetes Provider instance using the kubeconfig from the Digital Ocean cluster
const k8sProvider = new kubernetes.Provider('k8s-provider', {
    kubeconfig: cluster.kubeConfigs[0].rawConfig,
});

// Install Istio Egress Gateway using the Helm Chart
// Be sure to have added the Istio Helm repository to your Helm configuration
const istioEgressGatewayChart = new kubernetes.helm.v3.Chart('istio-egress', {
    chart: 'istio-egressgateway',
    version: '1.10.0', // specify the version that is compatible with your Istio installation
    namespace: 'istio-system',
    fetchOpts:{
        repo: 'https://istio-release.storage.googleapis.com/charts',
    },
}, { provider: k8sProvider });

// Export the status of the Helm deployment
export const istioEgressGatewayStatus = istioEgressGatewayChart.status;
```

What this program does:

1. **Import Dependencies**: We import necessary modules from the Pulumi SDK which includes the Digital Ocean and Kubernetes modules, as well as core Pulumi functionality.

2. **Create the Cluster**: We define a Digital Ocean Kubernetes cluster with a specified name, region, Kubernetes version, and node count.

3. **Export kubeconfig**: The `kubeconfig` is the configuration required to connect to the Kubernetes cluster created in Digital Ocean. This configuration is exported, so it can be used outside of Pulumi if necessary, like for local `kubectl` usage.

4. **Kubernetes Provider**: The `kubernetes.Provider` resource is used to interact with the created Kubernetes cluster. We pass the `kubeconfig` to this provider so Pulumi knows how to communicate with our Digital Ocean Kubernetes cluster.

5. **Deploy Istio Egress Gateway**: The `kubernetes.helm.v3.Chart` resource represents a Helm chart. We specify the `istio-egressgateway` chart and the version we want to deploy, ensuring it is compatible with our Istio installation.

6. **Status Export**: We export the status of the Helm chart deployment, which can be used to understand if the deployment was successful and to debug if there are any issues.

Please ensure that before running this Pulumi program, you have the `istio-egressgateway` Helm chart available, and replace `'1.10.0'` with the version of the chart that is compatible with your Istio installation.

To run this Pulumi program, you must have the Pulumi CLI installed and configured with the necessary Digital Ocean and Kubernetes credentials. Save this code in a file called `index.ts`, and then simply execute `pulumi up` in the same directory as your file. Pulumi will perform the deployment and output the status upon completion.