Deploy the prometheus-webhook-dingtalk helm chart on Opensshift

Question

Pulumi · Accepted Answer

To deploy the `prometheus-webhook-dingtalk` Helm chart to an OpenShift cluster using Pulumi, we will be utilizing the `@pulumi/kubernetes` package which allows us to interact with Kubernetes resources, including those provided by Helm charts.

Before you proceed, make sure you have the following prerequisites met:
1. Pulumi CLI installed and logged in to a state backend (https://www.pulumi.com/docs/get-started/install/).
2. `kubectl` installed and configured to connect to your OpenShift cluster (https://kubernetes.io/docs/tasks/tools/).
3. Your OpenShift cluster is running and accessible.

In this program, we'll create a Pulumi project using TypeScript to deploy the chart. The `kubernetes.helm.v3.Chart` class from the Pulumi Kubernetes provider will be used for deploying the Helm chart. This class enables us to specify the repository where the chart is located, the version of the chart, any custom values we wish to pass to the Helm chart, and the namespace where the chart should be deployed, among other things.

Here is a comprehensive walkthrough of the Pulumi TypeScript program that accomplishes this:

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

// The name of the Helm chart we want to deploy.
const chartName = 'prometheus-webhook-dingtalk';

// The repository where the Helm chart is located.
const chartRepo = 'https://prometheus-community.github.io/helm-charts';

// The namespace where you want to deploy the Helm chart.
const namespace = 'monitoring';

// If you have any custom values that you want to provide to the Helm chart,
// you can define them here in this object.
const customValues = {
    // Replace these values with the appropriate configuration for prometheus-webhook-dingtalk
    webhook: {
        service: {
            port: "yourPort", // Use string values here to correspond with Helm's expectations
        },
        dingtalk: {
            url: "yourDingTalkWebhookUrl",
            secret: "yourSecret",
        },
        // Additional custom configuration can go here
    },
};

// Create an instance of the Helm chart.
const dingtalkChart = new k8s.helm.v3.Chart(chartName, {
    chart: chartName,
    version: '1.0.0', // Replace with the actual version number of the Helm chart
    fetchOpts: {
        repo: chartRepo,
    },
    namespace: namespace,
    values: customValues,
});

// Export the Chart's name to confirm deployment
export const dingtalkChartName = dingtalkChart.metadata.apply(metadata => metadata.name);

```

Here's what's happening in the code above:

- We import the necessary module from `@pulumi/kubernetes`.
- We define some constants for clarity and ease of change in the future, such as the chart name, chart repository URL, chart namespace, and any custom values required by the chart.
- We instantiate a `Chart` object which represents the `prometheus-webhook-dingtalk` Helm chart, passing in the chart name, version, and location as well as any custom values.
- Finally, we export a stack output, which in this case is the metadata name of the deployed chart. This output will be displayed upon completion of `pulumi up` and can be used to confirm that the Helm chart was deployed successfully.

To deploy this program:

1. Initialise a new Pulumi project with `pulumi new` and select `typescript` as the template.
2. Install the required Pulumi Kubernetes package by running `npm install @pulumi/kubernetes`.
3. Save the above code to `index.ts` in the Pulumi project directory.
4. Run `pulumi up` to execute the code and deploy the Helm chart to your OpenShift cluster.

Please ensure you adjust the chart version, custom values, and namespace to suit your particular requirements. If you wish to customize the deployment further, refer to the Pulumi documentation for the Kubernetes provider here: https://www.pulumi.com/docs/reference/pkg/kubernetes/helm/v3/chart/ and the Prometheus Webhook Dingtalk Helm chart repository for configuration options.