Deploy the ravendb-cluster helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy the `ravendb-cluster` Helm chart on Oracle Kubernetes Engine (OKE), we will proceed with the following steps:

1. **Create an Oracle Kubernetes Engine (OKE) cluster**: To deploy a Helm chart, we first need a running Kubernetes cluster. We'll create an OKE cluster resource.
2. **Deploy the Helm chart**: Once the cluster is ready, we will use the `kubernetes.helm.v3.Chart` resource from Pulumi's Kubernetes provider to deploy the `ravendb-cluster` Helm chart.

Below is the TypeScript program that accomplishes these steps. Please make sure that you have the necessary access and permissions to create and manage resources in Oracle Cloud Infrastructure before running this code. Additionally, you will need to have Pulumi installed and configured to work with your Oracle Cloud account.

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

// Create an Oracle Kubernetes Engine cluster
const okeCluster = new oci.ContainerEngine.Cluster('okeCluster', {
  // Specify required information for OKE
  // Compartment ID where the OKE cluster should be created
  compartmentId: 'your-compartment-id',
  // VCN ID where the OKE cluster should reside
  vcnId: 'your-vcn-id',
  // Kubernetes version
  kubernetesVersion: 'v1.21.1',
  // Node pool configuration, etc.
  options: {
    // Additional OKE options if necessary
  },
});

// Define the kubeconfig to connect to the OKE cluster
const kubeconfig = pulumi.all([okeCluster.id]).apply(([clusterId]) => {
  // Use the OKE cluster to generate the kubeconfig
  return oci.ContainerEngine.getClusterKubeconfig({
    clusterId: clusterId,
  });
});

// Using the generated kubeconfig, setup the Kubernetes provider to deploy Helm charts
const k8sProvider = new k8s.Provider('k8sProvider', {
  kubeconfig: kubeconfig,
});

// Deploy the ravendb-cluster Helm chart using the Kubernetes provider
const ravendbChart = new k8s.helm.v3.Chart('ravendb-cluster', {
  chart: 'ravendb-cluster',
  // You may need to specify the repository if the chart is not in the default Helm repo
  fetchOpts: {
    repo: 'http://charts.ravendb.net/',
  },
  // Specify namespace or leave as default
  namespace: 'default',
  // Values to override within the Helm chart
  values: {
    // Custom values to configure ravendb-cluster
  },
}, { provider: k8sProvider });

// Export any required information, for example the cluster's endpoint
export const clusterEndpoint = okeCluster.endpoints.apply(ep => ep.kubernetes);

// Program finished - the Helm chart inside the OKE cluster will be deployed
```

Here is a breakdown of the code:

- The `oci.ContainerEngine.Cluster` resource is used to create a new Oracle Kubernetes Engine cluster. You need to replace `'your-compartment-id'` and `'your-vcn-id'` with the appropriate identifiers for your Oracle Cloud account.
- Once the OKE cluster is ready, we use the `oci.ContainerEngine.getClusterKubeconfig` function to generate the kubeconfig, which allows us to interact with the cluster using Kubernetes commands.
- We create a new Pulumi Kubernetes provider instance, passing the kubeconfig of our OKE cluster.
- Using the `k8s.helm.v3.Chart` resource, we deploy the `ravendb-cluster` Helm chart into our cluster. If the Helm chart is not in the default repository, we specify the chart's repository URL.
- The `values` field in the Helm chart resource is where you can specify any configurations that are specific to `ravendb-cluster`. Check the chart's documentation for what values you can configure.
- An endpoint of the OKE cluster is exported as `clusterEndpoint`, which you can use to interact with your Kubernetes cluster.

You must have `pulumi`, `@pulumi/pulumi`, `@pulumi/oci`, and `@pulumi/kubernetes` libraries installed in your project. You can install them using npm or yarn:

```shell
npm install @pulumi/pulumi @pulumi/oci @pulumi/kubernetes
```

or

```shell
yarn add @pulumi/pulumi @pulumi/oci @pulumi/kubernetes
```

After writing the code, you can deploy the cluster and the Helm chart by running the following commands:

```shell
pulumi up
```

This command will provision the resources as defined in the code. Follow the on-screen prompts provided by Pulumi to approve and monitor the deployment process.