Deploy the prometheus-alertmanager helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the Prometheus Alertmanager using a Helm chart on a Kubernetes cluster with Pulumi, we'll use the `kubernetes.helm.v3.Chart` resource from the Pulumi Kubernetes Provider. This resource allows you to install, upgrade, and manage Helm charts in your Kubernetes cluster.

In this program, we will:

1. Create an instance of `Chart` which represents the Prometheus Alertmanager Helm chart.
2. The `Chart` requires a chart name and optionally a chart version and values that override defaults set in the Helm chart.

Before you begin, you'll need to ensure you have Pulumi installed and set up, along with access to a Kubernetes cluster where you can deploy the Helm chart. You'll also need to have Helm installed locally to fetch the chart details, or you can specify a repository where the chart is hosted.

Here's a complete program to deploy the Prometheus Alertmanager Helm chart in TypeScript:

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

// Example: Deploying Prometheus Alertmanager using its Helm Chart in a Kubernetes cluster

const prometheusAlertmanager = new k8s.helm.v3.Chart('prometheus-alertmanager', {
    chart: 'alertmanager',
    version: '0.22.2', // Use the version of the Helm chart that you want to deploy
    fetchOpts:{
        repo: 'https://prometheus-community.github.io/helm-charts',
    },
    // Values in this object override the default values in the Helm chart
    // For illustration, we're setting the replica count to 1.
    // Refer to the actual chart for all configurable options.
    values: {
        alertmanager: {
            config: {
                global: {
                    resolve_timeout: '5m',
                },
                route: {
                    group_by: ['job'],
                    group_wait: '30s',
                    group_interval: '5m',
                    repeat_interval: '12h',
                    receiver: 'web.hook',
                },
                receivers: [
                    {
                        name: 'web.hook',
                        webhook_configs: [
                            {
                                url: 'http://example.com/<webhook-url>'
                                // Replace the above URL with the actual webhook receiver endpoint
                            }
                        ],
                    },
                ],
            },
        },
        // Set to 1 for demonstration purposes, though the default might already be 1.
        replicaCount: 1,
    },
});

// Export the name of the chart
export const helmChartName = prometheusAlertmanager.metadata.name;
```

In this code snippet:

- We import the required `@pulumi/pulumi` and `@pulumi/kubernetes` modules which contain the functionality to interact with Pulumi and the Kubernetes API.
- We create a new `Chart` resource named `prometheus-alertmanager` that installs the Prometheus Alertmanager chart.
- We specify the chart name `'alertmanager'` and a version number (you should replace `'0.22.2'` with the actual version you want to deploy).
- We use `fetchOpts` to specify the repository URL for the Prometheus community Helm charts.
- We override some default configuration parameters in the `values` object to customize the Alertmanager deployment, for instance, setting up a `webhook_configs` receiver. You should replace the `url` field with the URL of your actual webhook receiver endpoint.

Please make sure to check the official [Prometheus Chart](https://github.com/prometheus-community/helm-charts/tree/main/charts/alertmanager) and [Helm Chart Configuration](https://helm.sh/docs/topics/charts/#chart-config-files) documentation for more details on configuring the chart and to understand all customization options.

Finally, we export a stack output `helmChartName`, which is the name of the deployed Helm chart. You can access this output after the deployment using the Pulumi CLI or in the Pulumi Console.

To run this Pulumi program, save the code to a file with a `.ts` extension, such as `index.ts`, then execute it using the Pulumi CLI commands:

```bash
pulumi up
```

This will start the deployment process. Follow the on-screen prompts to preview and then confirm the deployment. After the deployment is complete, you will see the exported `helmChartName` value which you can use to reference the deployed chart.

Remember that to successfully deploy to your Kubernetes cluster, your Pulumi CLI must be configured with access to the cluster (via `kubeconfig`), and you need to ensure that Helm and its repositories are configured correctly in your environment.