Deploy the snmp-exporter helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the SNMP Exporter Helm chart on Kubernetes using Pulumi, you'll want to use the `Chart` resource from the `@pulumi/kubernetes` package. This allows you to deploy Helm charts in a Pulumi program.

Here's a step-by-step explanation followed by a TypeScript program that achieves this:

1. **Import dependencies**: We'll need to import the necessary packages from Pulumi, specifically the `@pulumi/pulumi` and `@pulumi/kubernetes` packages.

2. **Create a Kubernetes Provider**: This is necessary if you need to target a specific Kubernetes cluster rather than the default one configured with `kubectl`. For this example, we'll assume you already have a configured Kubernetes context.

3. **Deploy the Helm Chart**: We'll use the `Chart` resource to deploy the SNMP Exporter Helm chart. You need to specify the name of the chart (`snmp-exporter` in this case) and the repository where the Helm chart is located. You can also provide a set of values that override the default configurations in the Helm chart, but for simplicity, we won't provide any in this example.

4. **Export Outputs**: Optionally, you might want to export any resulting resource properties, such as the deployed service's endpoint.

Here is the TypeScript program for the Pulumi application:

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

// Replace with the appropriate chart version.
const chartVersion = "0.1.0";

// Replace with the appropriate namespace if different from "default".
const namespace = "default";

// Create a Kubernetes provider instance, using the default context from `kubectl`.
// You can specify a different context if you have multiple configurations.
const provider = new kubernetes.Provider("k8s-provider", {});

// Deploy the snmp-exporter Helm chart using the Chart resource.
const snmpExporterChart = new kubernetes.helm.v3.Chart("snmp-exporter", {
    chart: "snmp-exporter",
    version: chartVersion,
    namespace: namespace,
    fetchOpts: {
        // Make sure to replace this with the actual repo URL.
        repo: "https://helm-repository-url/where-chart-is-located",
    },
}, { provider: provider });

// Export the SNMP Exporter service endpoint.
const snmpExporterService = snmpExporterChart.getResource("v1/Service", "snmp-exporter-snmp-exporter");
export const snmpExporterEndpoint = snmpExporterService.status.apply(status => status.loadBalancer.ingress[0].hostname || status.loadBalancer.ingress[0].ip);

```

Make sure to replace `"https://helm-repository-url/where-chart-is-located"` with the actual URL of the Helm repository where the SNMP Exporter chart is located. You also need to ensure that the `chartVersion` variable matches the version of the SNMP Exporter you wish to deploy.

The `getResource` function is used to retrieve a specific resource that the Helm chart creates, in this case, a Kubernetes Service object. We're assuming the service is named `snmp-exporter-snmp-exporter`, which is a common naming pattern for Helm deployments but may differ based on the Helm chart you're using. Adjust the function's arguments as necessary.

Finally, we export the `snmpExporterEndpoint`, which dynamically fetches the ingress information from the deployed service and makes it available outside of Pulumi as an output.

To use this Pulumi program, you'll need to install the Pulumi CLI, set up your Kubernetes cluster, and configure access via `kubectl`. Save the code to a file named `index.ts`, run `pulumi up`, and Pulumi will perform the deployment.