Deploy the postfix helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy the Postfix Helm chart on Oracle Kubernetes Engine (OKE), you will need to perform the following steps using Pulumi with TypeScript:

1. Set up the Oracle Cloud Infrastructure (OCI) provider to manage resources in Oracle Cloud.
2. Create or configure access to an Oracle Kubernetes Engine (OKE) cluster.
3. Use the Pulumi Kubernetes Provider to deploy the Postfix Helm chart to the OKE cluster.

I'll provide you with a Pulumi program written in TypeScript that demonstrates these steps. In this program, we'll use:

- The `oci.ContainerEngine.Cluster` resource which represents the OKE cluster in Oracle Cloud.
- The `kubernetes.helm.v3.Chart` resource to deploy the Postfix Helm chart on the OKE cluster.

Below is a comprehensive program that sets up the required resources and the Helm chart deployment:

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

// Configure the Oracle Cloud Infrastructure provider
// Assumption: You have the correct configuration set within your OCI config file or the environment variables.
const provider = new oci.Provider("oci", {/* If needed, add provider configuration here */});

// Reference to an existing OKE cluster
// Assumption: The OCI OKE Cluster is already created and available.
// Replace 'clusterId' with the actual OCP OKE Cluster OCID
const clusterId = "ocid1.cluster.oc1.iad.example";
const okeCluster = oci.containerengine.Cluster.get("okeCluster", clusterId, undefined, { provider: provider });

// Retrieve the Kubeconfig of the OKE cluster
const kubeconfig = pulumi.all([okeCluster.id, okeCluster.name]).apply(([id, name]) => 
  oci.containerengine.getClusterKubeConfig({
    clusterId: id,
    name: name,
    expiration: 6000,
  })
);

// Create a Kubernetes provider instance using the kubeconfig from the OKE cluster
const k8sProvider = new k8s.Provider("okeK8sProvider", {
  kubeconfig: kubeconfig.clientCertificate
});

// Deploy the Postfix Helm chart using the Helm provider
const postfixChart = new k8s.helm.v3.Chart("postfix", {
  chart: "postfix",
  version: "1.0.0", // specify the version of the chart
  fetchOpts: {
    repo: "https://example.com/helm-charts", // replace with the actual Helm chart repository URL
  },
}, { provider: k8sProvider });

// Export the cluster name and the Chart name
export const clusterName = okeCluster.name;
export const chartName = postfixChart.metadata.apply(m => m.name);

```

Let's break down the code:

- We start by importing the necessary Pulumi libraries.
- We then configure the OCI provider and assume that you have set the OCI configuration correctly in your local setup, either through a config file or environment variables.
- We retrieve an existing OKE cluster by its OCID. The OCID needs to be replaced with the actual OCID of your OKE cluster.
- The Kubeconfig is fetched for the given OKE cluster. This allows the Kubernetes provider to interact with the cluster.
- A `k8s.Provider` is created using the retrieved Kubeconfig, which will be used for deploying resources to the OKE cluster.
- We define a new Helm chart resource representing the Postfix chart deployment. Replace the `repo` field's value with the actual Helm chart repository URL, and specify the chart version you wish to deploy.
- Finally, we export the cluster's name and the deployed chart's name for easy access and reference.

Make sure to have Pulumi installed and configured correctly, and the OCI CLI configured with the necessary authentication to your Oracle Cloud account. You will also need to have kubectl installed and configured to interact with the OKE cluster if you want to inspect the resources manually.