Deploy the prometheus-k8s-services helm chart on Oracle Kubernetes Engine (OKE)

Question

Pulumi · Accepted Answer

To deploy the Prometheus Kubernetes services Helm chart on Oracle Kubernetes Engine (OKE), we'll need to perform several steps using Pulumi and the relevant providers. The process includes setting up Oracle Cloud Infrastructure (OCI) configurations, configuring the Kubernetes provider to interact with the OKE cluster, and finally deploying the Helm chart.

Below is a Pulumi program in TypeScript that outlines each of these steps. The program assumes you have already set up your Oracle Cloud Infrastructure (OCI) account and installed the necessary CLI tools and Pulumi on your local machine. Also, ensure you're logged into OCI via the CLI and have the necessary permissions to create and manage resources in your account.

The primary components used in this solution are:

1. `oci.ContainerEngine.Cluster` - This resource is used to interact with OKE to retrieve configuration information for connecting to the Kubernetes cluster.
2. `kubernetes.Provider` - With this provider, we configure Pulumi to connect to the Kubernetes cluster in OKE.
3. `kubernetes.helm.v3.Chart` - This resource is responsible for deploying a Helm chart to a Kubernetes cluster.

Here's a complete Pulumi program to deploy the Prometheus chart on OKE:

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

// Retrieve an OCI provider and the details of your OKE cluster here
const provider = new oci.Provider('oci', {/* OCI configuration options */});

// Define the configuration for the OKE cluster
const okeCluster = new oci.ContainerEngine.Cluster(/* parameters for OKE cluster setup */, { provider: provider });

// Use the Kubeconfig from the OKE cluster to configure the Kubernetes provider
const kubeProvider = new kubernetes.Provider('okeK8s', {
    kubeconfig: okeCluster.kubeconfig.apply(JSON.stringify),
});

// Deploy the Prometheus Kubernetes services Helm chart onto OKE
const prometheusChart = new kubernetes.helm.v3.Chart('prometheus', {
    chart: 'prometheus',
    version: 'x.y.z', // specify the version of the chart
    fetchOpts: {
        repo: 'https://prometheus-community.github.io/helm-charts', // the Helm chart repository
    },
}, { provider: kubeProvider });

// Export the endpoint of the Prometheus server
export const prometheusEndpoint = prometheusChart.getResourceProperty('v1/Service', 'prometheus-server', 'status')
    .apply(status => status.loadBalancer.ingress[0].ip || status.loadBalancer.ingress[0].hostname);
```

Explanation of the code:
- We begin by importing the necessary modules from the Pulumi library.
- We set up an OCI provider to handle interactions with the Oracle Cloud Infrastructure.
- Next, we configure a Kubernetes provider by retrieving the kubeconfig from our OKE cluster, dynamically creating a connection to our Kubernetes cluster.
- A Helm chart for Prometheus is deployed on the cluster using the `kubernetes.helm.v3.Chart` resource. You will need to replace `'x.y.z'` with the specific version of the Prometheus chart you wish to deploy. 
- Finally, we export the Prometheus server endpoint, which can be used to interact with the Prometheus instance.

Make sure to replace the `/* OCI configuration options */` and `/* parameters for OKE cluster setup */` with the actual values required for your OCI account and OKE setup. You might need to configure your OCI credentials, define the OKE cluster ID, and other configurations that match your specific OCI setup.

After creating this Pulumi program, you can deploy it by running `pulumi up` in the directory containing the program.

Please note that proper error handling, environment specific configurations, and security practices should be considered for a production setup, such as storing sensitive values in a secure way, using more specific selector criteria for the export, and ensuring you are managing resources in accordance with your organization's policies.