Deploy the aws-rds-postgresql-database helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy an AWS RDS PostgreSQL database using a Helm chart on Oracle Kubernetes Engine (OKE), you'll need to perform several steps:

1. Set up and configure OCI (Oracle Cloud Infrastructure) to work with Pulumi.
2. Provision an OKE cluster if one does not already exist.
3. Install the Helm CLI tool and add repositories for RDS PostgreSQL Helm chart.
4. Configure the Kubernetes provider to communicate with the OKE cluster.
5. Define and deploy the Helm chart for AWS RDS PostgreSQL through Pulumi.

Below is a Pulumi TypeScript program to guide you through this process. This assumes you have already set up OCI and Pulumi, and have the necessary OCI and Kubernetes configuration available to interact with your OKE cluster and OCI account.

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

// Define the OKE cluster if you do not have one already running
const okeCluster = new oci.ContainerEngine.Cluster("my-cluster", {
    // Replace with the proper compartmentId, vcnId, kmsKeyId, kubernetesVersion, etc.
    compartmentId: "ocid1.compartment.oc1..exampleuniqueID",
    kubernetesVersion: "v1.21.0",
    name: "oke-cluster-example",
    vcnId: "ocid1.vcn.oc1.region.exampleuniqueID",
    options: {
        serviceLbConfig: {
            subnetIds: ["subnet_ocid1", "subnet_ocid2"],
        },
    },
});

// Set up OKE Kubernetes provider to interact with the created cluster
const k8sProvider = new kubernetes.Provider("k8sProvider", {
    kubeconfig: okeCluster.kubeconfigs[0].content,
});

// Install a Helm chart for the RDS PostgreSQL database
const postgresqlDatabase = new kubernetes.helm.v3.Chart("aws-rds-postgres", {
    // Specify the chart repository here
    // This repo URL is an example and may need to be changed to the specific Helm chart URL
    chart: "aws-rds-postgres",
    fetchOpts: {
        repo: "https://charts.bitnami.com/bitnami",
    },
    // Configure the chart values such as PostgreSQL version, instance size, credentials, etc.
    values: {
        // Replace the placeholder values according to your needs
        replicaCount: 1,
        image: {
            registry: "docker.io",
            repository: "bitnami/postgresql",
            tag: "11.9.0",
        },
        postgresqlUsername: "admin",
        postgresqlPassword: "<your-password>",
        postgresqlDatabase: "myDatabase",
        service: {
            type: "LoadBalancer",
        },
        // Reference any necessary OCI resources (like subnets, security groups, etc.)
        // For AWS RDS, you need to set up proper networking and permissions
    },
}, { provider: k8sProvider });

// Export the PostgreSQL database's LoadBalancer IP to access it externally
export const postgresqlDatabaseIp = postgresqlDatabase.getStatus("service").ip;
```

This program sets up a Kubernetes provider that hooks into your Oracle Kubernetes Engine cluster. It then defines a Helm chart resource for deploying an AWS RDS PostgreSQL compatible chart from the Bitnami Helm repository (please note, the example URL is a placeholder; you will need to find the actual URL for the AWS RDS PostgreSQL Helm chart repository). The values within the Chart object should be configured according to the configuration options available in the Helm chart and the AWS RDS requirements.

Please replace the placeholders for the OKE cluster and Helm chart configuration with actual values that fit your requirements. The `oci.ContainerEngine.Cluster` configuration assumes you already have a VCN (Virtual Cloud Network) and a subnet to deploy the LoadBalancer service. If you do not have these, you will need to create them before deploying the chart.

When you run this Pulumi program using `pulumi up`, it will provision the Kubernetes resources defined by the AWS RDS PostgreSQL Helm chart on your OKE cluster. After the deployment, you can use the exported `postgresqlDatabaseIp` to connect to your PostgreSQL database instance.