Deploy the postgres-connector helm chart on Opensshift

Question

Pulumi · Accepted Answer

Deploying a Helm chart on OpenShift is similar to deploying on Kubernetes, as OpenShift is a Kubernetes distribution with additional features. You'll be doing this with Pulumi's Kubernetes package, specifically using the `helm.sh/v3.Chart` resource. This resource allows you to install Helm charts from a remote repository or a local path into an OpenShift or Kubernetes cluster.

To use the `Chart` resource, you should have Helm installed on your machine and Pulumi should be able to authenticate to your OpenShift cluster. You'll also need to provide the name of the chart and optionally, specify the values to configure the PostgreSQL connector according to your needs.

Additionally, OpenShift has stricter security measures compared to vanilla Kubernetes, which could require set up service accounts, roles, and role bindings. Therefore, it is recommended to ensure that the service account used by Helm has the necessary permissions on your OpenShift cluster or you can configure this within the Helm chart values.

Here is a program in TypeScript that deploys a Postgres Helm chart to an OpenShift cluster:

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

// The name of the Helm chart you wish to deploy.
const chartName = 'postgres-connector';

// The repository where your Helm chart is located.
const chartRepo = 'https://charts.bitnami.com/bitnami';

// The values you wish to provide to the Helm chart for configuration.
const chartValues = {
  postgresqlUsername: 'user',
  postgresqlPassword: 'password',
  postgresqlDatabase: 'mydatabase',
};

// Namespace where you want to deploy your chart.
const namespace = new k8s.core.v1.Namespace('namespace', {
  metadata: { name: 'postgres-namespace' }
});

// Deployment of the Helm Chart into the cluster.
const postgresConnectorChart = new k8s.helm.v3.Chart(chartName, {
  chart: chartName,
  version: 'chart version', // Replace with specific chart version you want to deploy
  namespace: namespace.metadata.name,
  fetchOpts: { 
    repo: chartRepo
  },
  values: chartValues,
});

// Export the Namespace name and the Helm Chart deployment status.
export const postgresNamespace = namespace.metadata.name;
export const deployedChart = postgresConnectorChart.status;
```

Let's break this down:

1. We import the Kubernetes Pulumi package, which provides the ability to interact with the Kubernetes API.
2. We define the Helm chart properties such as `chartName`, `chartRepo`, and `chartValues`. These should be configured according to the Helm chart you wish to deploy and your specific needs for configuration.
3. We create a Kubernetes Namespace resource, into which we will deploy our Helm chart. OpenShift supports Kubernetes namespaces which are used to isolate resources within the cluster.
4. Using `k8s.helm.v3.Chart`, we deploy the Helm chart into the specified namespace. The `fetchOpts` field is where you provide the repository URL.
5. To view the status of the deployment or the dynamic allocation of resources by Pulumi, we export some of the deployment details like the namespace name and the status of the Helm chart deployment.

Ensure that you replace the placeholder values for chart version and chart configuration (`chartValues`) with the appropriate values for your use case. Additionally, the specific version of the chart to be deployed should be specified to maintain consistency across deployments.

For more information on Pulumi's `k8s.helm.v3.Chart` resource, you can visit the [Pulumi Documentation](https://www.pulumi.com/registry/packages/kubernetes/api-docs/helm/v3/chart/).