Deploy the mongodb-backup-aws helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy the `mongodb-backup-aws` Helm chart on Oracle Kubernetes Engine (OKE), you will need to perform several steps using Pulumi. This process involves setting up the necessary cloud resources, configuring Kubernetes on OKE, and deploying the Helm chart.

Pulumi provides a Kubernetes provider that can be used to deploy Helm charts to a Kubernetes cluster, and for Oracle Kubernetes Engine, you can use Pulumi's OCI (Oracle Cloud Infrastructure) provider to manage the underlying infrastructure.

Here to help you understand, the process is broken down as follows:
1. **Setting up Oracle Cloud Infrastructure (OCI):** You need a Kubernetes cluster on OKE which can be provisioned using Pulumi's OCI provider.
2. **Configuring Kubernetes Provider:** Point Pulumi's Kubernetes provider to use the OKE cluster's context so that it can deploy resources inside the cluster.
3. **Deploying Helm Chart:** Define a `Chart` resource in your Pulumi program that references the `mongodb-backup-aws` Helm chart, and deploy it to the OKE cluster.

Below you will find a Pulumi program in TypeScript that carries out these steps. Make sure you have Pulumi installed, along with the necessary OCI plugins, and have authenticated to both Pulumi and OCI.

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

// Step 1: Provision an OKE Kubernetes Cluster
// Replace the following placeholder values with your actual OCI configuration
const compartmentId = "ocid1.compartment.oc1..xxxxxx"; // Replace with your compartment OCID
const vcnId = "ocid1.vcn.oc1..xxxxxx"; // Replace with your VCN OCID
const k8sVersion = "v1.21.4"; // Use a compatible Kubernetes version for OKE

const cluster = new oci.containerengine.Cluster("my-mongodb-cluster", {
    compartmentId: compartmentId,
    kubernetesVersion: k8sVersion,
    options: {
        serviceLbSubnetIds: ["ocid1.subnet.oc1..xxxxxx"] // Replace with your Load Balancer subnet OCIDs
    }
});

const nodePool = new oci.containerengine.NodePool("my-mongodb-nodepool", {
    clusterId: cluster.id,
    compartmentId: compartmentId,
    subnetIds: ["ocid1.subnet.oc1..xxxxxx"], // Replace with your worker node subnet OCIDs
    nodeShape: "VM.Standard2.1", // Specify the shape for the worker nodes
    quantityPerSubnet: 1,
    nodeConfigDetails: {
        size: 2, // Number of nodes
    }
});

// Step 2: Configure Kubernetes provider to point to the OKE cluster
const k8sProvider = new k8s.Provider("oke-k8s", {
    kubeconfig: cluster.kubeconfig,
});

// Step 3: Deploy the `mongodb-backup-aws` Helm chart
const mongodbBackupChart = new k8s.helm.v3.Chart("mongodb-backup", {
    chart: "mongodb-backup-aws",
    // You might need to specify a repository here if the chart is not in the default repo
    values: {
        // Define any values needed for the mongodb-backup-aws Helm chart here
    },
}, { provider: k8sProvider });

// Export the cluster's kubeconfig
export const kubeconfig = cluster.kubeconfig;

```

This Pulumi program creates a Kubernetes cluster on OKE, configures the Kubernetes provider to interact with the cluster, and then deploys a Helm chart to the cluster.

The program defines a cluster and a node pool under your compartment with the specified Kubernetes version and shape for the nodes. It then creates a `Provider` resource that uses the generated kubeconfig file from the OCI cluster to interact with your Kubernetes cluster. Finally, the program declares a `Chart` resource representing the deployment of the MongoDB backup solution using a Helm chart.

Be sure to replace the placeholder values with the appropriate values that match your Oracle Cloud Infrastructure setup, such as the compartment OCID, VCN OCID, and subnet OCIDs. If the `mongodb-backup-aws` Helm chart is not available in the default Helm repository, make sure to specify the repository URL and any configuration values required by the chart.

Keep in mind that handling backups to AWS might require additional setup, such as providing the right IAM roles and policies, as well as configuring the Kubernetes cluster with the necessary secrets to access the AWS services. These steps are not covered here but need to be carefully handled as part of a robust backup strategy.