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

Question

Pulumi · Accepted Answer

To deploy the hono helm chart on Oracle Kubernetes Engine (OKE), we will follow a series of steps that combine the use of OCI for provisioning the Kubernetes cluster and the Kubernetes Helm package to deploy the hono chart.

Firstly, ensure that you have the necessary Pulumi stack and OCI configuration in place to interact with your Oracle Cloud Infrastructure.

Here's what we're going to do:

1. Set up an Oracle Kubernetes Engine (OKE) cluster using the `oci.ContainerEngine.Cluster` resource type.
2. Upon successful creation of the OKE cluster, we'll configure Pulumi to use the resulting kubeconfig to communicate with the cluster.
3. Finally, we'll deploy the hono helm chart to the cluster using the `kubernetes.helm.v3.Chart` resource type.

Here is your Pulumi program to achieve this:

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

// Step 1: Create an Oracle Kubernetes Engine (OKE) cluster
const cluster = new oci.containerengine.Cluster("myCluster", {
    // Required properties like compartment ID, VCN ID, etc., specific to your OCI setup
    compartmentId: "ocid1.compartment.oc1..your_compartment_id",
    kubernetesVersion: "v1.20.8", // Specify the version of Kubernetes you want to use
    name: "honoCluster",
    options: {
        // Configure according to your requirements
        serviceLbSubnetIds: ["ocid1.subnet.oc1..your_subnet_id1", "ocid1.subnet.oc1..your_subnet_id2"]
    },
    vcnId: "ocid1.vcn.oc1..your_vcn_id",
    // ...other required configuration
});

// Step 2: Configure Kubernetes provider to communicate with the OKE cluster
const kubeconfig = pulumi.
    all([cluster.name, cluster.id]).
    apply(([name, clusterId]) => {
        // Replace with the code to fetch kubeconfig content generated when the OKE cluster is created
        const generatedKubeconfig: string = ""; // Fetch and populate the kubeconfig for OKE cluster
        return generatedKubeconfig;
    });

const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: kubeconfig,
});

// Step 3: Deploy the hono helm chart into the Kubernetes cluster
const honoChart = new k8s.helm.v3.Chart("hono", {
    // Specify the chart, version, repository and other chart-related configurations
    chart: "hono",
    version: "1.0.0", // Use the desired chart version
    fetchOpts: {
        repo: "http://helm.eclipse.org/hono", // Adjust the repo URL where the hono helm chart is located
    },
}, { provider: k8sProvider });

// Export the cluster name and kubeconfig to access the cluster later on
export const clusterName = cluster.name;
export const kubeconfigContent = kubeconfig; // Exporting kubeconfig directly can be insecure; handle with care.
```

In this program:

- We use the `oci.ContainerEngine.Cluster` resource to create an OKE cluster. You will need to supply your compartment ID, VCN ID, Kubernetes version, and other configurations as required by your environmental setup. The `serviceLbSubnetIds` are required for Load Balancer service type in Kubernetes, ensure they are valid subnet OCIDs within the specified VCN.
  
  [OCI Container Engine Cluster Documentation](https://www.pulumi.com/docs/reference/pkg/oci/containerengine/cluster/)

- Then after the cluster is provisioned, we retrieve the kubeconfig information, allowing us to communicate with the cluster. This would typically involve an OCI CLI command or an API call to get the kubeconfig content from the created OKE cluster. Replace the placeholder code with the implementation specific to your OCI setup.

- For Kubernetes-related operations, we utilize the `@pulumi/kubernetes` package to provide the k8s provider with the kubeconfig obtained from the created cluster.

- The `kubernetes.helm.v3.Chart` resource is used to deploy the hono helm chart into the Kubernetes cluster. Remember to replace the `chart`, `version` and `fetchOpts.repo` with the appropriate values for the helm chart you want to deploy. The version and repo URL used here are for illustrative purposes; you need to specify them based on the actual details of the hono chart you're deploying.

[Helm Chart Resource Documentation](https://www.pulumi.com/docs/reference/pkg/kubernetes/helm/v3/chart/)

Please make sure to replace all placeholder values with the appropriate values from your OCI account and Kubernetes cluster configuration. Also, note that passing sensitive values like kubeconfig directly might not be secure and should be handled with care.