Deploy the cadc-tap-postgres helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy the `cadc-tap-postgres` Helm chart on Oracle Kubernetes Engine (OKE), we'll first need to create an OKE cluster using the `oci.ContainerEngine.Cluster` resource. After the cluster is set up, we can then use the `kubernetes.helm.sh/v3.Chart` resource to deploy the Helm chart onto our Kubernetes cluster.

Below is a TypeScript program using Pulumi to accomplish these tasks. This program assumes you've already set up Pulumi and have the appropriate OCI provider configuration in place.

1. **Setting up the OKE Cluster**: We start by defining an OKE cluster.
2. **Deploy the Helm Chart**: Once we have an OKE cluster, we install the Helm chart by referencing it, assuming the chart is available in a Helm repository.

Here's a TypeScript program that outlines these steps:

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

// Define the OKE cluster
const okeCluster = new oci.ContainerEngine.Cluster("myOkeCluster", {
    // Replace these with actual values or configuration references
    compartmentId: "YOUR_OCI_COMPARTMENT_ID",
    kubernetesVersion: "v1.20.8",
    options: {
        // Configure as needed for your specific requirements
        serviceLbSubnetIds: ["YOUR_SUBNET_ID_ONE", "YOUR_SUBNET_ID_TWO"],
    },
    // You can specify additional options as documented
});

// Export the OKE cluster kubeconfig to allow Helm to interact with it
export const kubeconfig = okeCluster.kubeconfig;

// Set up the provider to use the exported kubeconfig
const k8sProvider = new k8s.Provider("okeK8sProvider", {
    kubeconfig: kubeconfig,
});

// Define the Helm chart for cadc-tap-postgres
const cadcTapPostgresChart = new k8s.helm.v3.Chart("cadcTapPostgres", {
    chart: "cadc-tap-postgres",
    // Specify the Helm repository here if it's not a stable chart or add it using `helm repo add`
    fetchOpts: {
        repo: "https://charts.example.com/",
    },
    // You can specify the chart version and values as needed
    version: "1.2.3", // Replace with the version you want to deploy
    values: {
        // Custom values for the chart
        postgresql: {
            username: "tap_admin",
            password: "tap_password",
            database: "cadc_tap",
        },
    },
}, { provider: k8sProvider });

// Export any information required to interact with the chart once deployed
export const chartName = cadcTapPostgresChart.metadata.apply(meta => meta.name);
```

### Explanation

- **OCI Kubernetes Cluster**: The `oci.ContainerEngine.Cluster` resource creates an OKE cluster in the specified compartment with the specified version of Kubernetes.
- **Provider**: The `k8s.Provider` resource wires up the kubeconfig from the newly created OKE cluster, so that Helm can manage resources on it.
- **Helm Chart**: The `k8s.helm.v3.Chart` resource is responsible for deploying the Helm chart to your cluster. Point to the repository where your chart is hosted and specify the version and any custom configuration via the `values` object.

### Note

This is a high-level setup. Details like specifying the compartment ID, VCN, subnet IDs are essential to correctly provision the resources and are unique to your OCI environment, which needs to be replaced with actual details from your environment.

After deploying the application, you may want to set up ingress controllers, domain names, and TLS certificates to make the application accessible securely over the Internet. This can also be done using additional Pulumi resources.