Deploy the postgresql-client helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the `postgresql-client` Helm chart on a Kubernetes cluster using Pulumi, you will use the `Chart` resource from the `@pulumi/kubernetes` package. This resource allows you to install Helm charts into your Kubernetes cluster from code.

Below, is a step-by-step explanation followed by the Pulumi program written in TypeScript:

1. **Set Up Your Project**: Make sure you have Pulumi installed and set up with your chosen Kubernetes cluster. If you haven't yet, you'll need to configure Pulumi for your Kubernetes environment.

2. **Installation of Pulumi Package**: Install the `@pulumi/kubernetes` NPM package which allows you to interact with Kubernetes resources.

```
    npm install @pulumi/kubernetes
    ```

3. **Helm Chart Resource**: The `Chart` resource from the `@pulumi/kubernetes/helm/v3` module is what you'll use to deploy Helm charts. It requires parameters like chart name, version, and any custom values you want to pass to the Helm chart.

4. **Specify Configuration for Chart**: You can customize the installation by specifying the version, values, repository, etc.

Here's the Pulumi program that deploys the `postgresql-client` Helm chart:

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

// Initialize a new Pulumi Kubernetes Chart component resource which
// deploys the postgresql-client Helm chart from the Bitnami repository.
const postgresqlClientChart = new kubernetes.helm.v3.Chart('postgresql-client', {
    chart: 'postgresql-client',
    version: '10.9.2', // Specify the version of the chart you wish to deploy, adjust it as per your requirement
    fetchOpts: {
        repo: 'https://charts.bitnami.com/bitnami', // The repository URL where the chart is hosted
    },
    // Here you can specify any custom values you want to override in the chart.
    // For this purpose, provide an object with the desired values.
    values: {
        // For example, if you need to set a specific name for the database,
        // uncomment the following line and specify the name.
        // postgresqlDatabase: 'mydatabase',
    },
});

// Export the endpoint for the PostgreSQL client. Depending on the chart, you might have to adjust what exactly is being exported.
export const postgresqlClientEndpoint = postgresqlClientChart.getResourceProperty(
    'v1/Service',
    'postgresql-client', // The name of the service might differ, adjust according to your chart.
    'status'
).apply(status => status.loadBalancer.ingress[0].ip);

```

When you run this program with Pulumi, it will deploy the `postgresql-client` Helm chart in the configured Kubernetes cluster. The chart's default values are used unless you specify overrides. In the example above, we have commented out the `values` field for custom configuration, which you can uncomment and adjust according to your needs.

The `export` at the bottom of the script is used to export any output values from the deployment, which is typical for resources that might create an external endpoint. For instance, if the PostgreSQL client service provisions an external load balancer, you might export its IP address.

To deploy this, you would simply run `pulumi up` in your terminal, and Pulumi will handle the deployment process for you, displaying the progress and resources being created.

Remember to replace the `version` and `values` with the specific details of the PostgreSQL client Helm chart you intend to deploy. If you're unsure of the configuration options available for the `postgresql-client` chart, you can usually find them documented in the Helm chart's `values.yaml` file or on the Helm chart's page in the Bitnami chart repository.