Deploy the slack-notifications helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy a Helm chart on Linode Kubernetes Engine (LKE) using Pulumi, there are a series of steps we will follow:

1. **Set Up the Pulumi Project**: We'll initialize a new Pulumi project, install necessary dependencies, and import the required packages.
2. **Configure Kubernetes Provider**: We will instantiate the Kubernetes provider which connects to the LKE cluster. For this, we'll assume you have `kubeconfig` that's configured to connect to your LKE cluster.
3. **Instantiate Helm Chart**: We will deploy the 'slack-notifications' Helm chart to the LKE cluster, supplying it with any required values.

Let's start by initializing a Pulumi project in TypeScript. Ensure you have Node.js, Pulumi CLI, and `kubectl` installed on your local system, and your `kubectl` is configured with credentials to access your Linode Kubernetes cluster.

Firstly, you need to create a new Pulumi project:

```sh
pulumi new typescript -y
```

Change into the newly created directory which contains your Pulumi project and install the Kubernetes package:

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

Now, let's create a TypeScript program to deploy the 'slack-notifications' Helm chart to your LKE cluster.

Below is the full TypeScript program for deploying the Helm chart:

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

// Step 1: Instantiate the Kubernetes provider using credentials from the kubeconfig file
// Pulumi will automatically use the current context in kubeconfig
// Make sure your kubeconfig is set up to connect to the LKE cluster.
const provider = new k8s.Provider("lke-provider", {
    kubeconfig: process.env.KUBECONFIG, // Using the KUBECONFIG environment variable
});

// Step 2: Define the Helm chart from a remote repository
// This example assumes 'slack-notifications' is the name of the chart
// and it is available in a repository that we added to Helm.
const slackNotificationsChart = new k8s.helm.v3.Chart("slack-notifications", {
    // Assuming a namespace for the deployment exists, specify it or use the default namespace.
    namespace: "default",
    chart: "slack-notifications",
    // Specify the version of the Helm chart.
    version: "1.0.0", // Replace with the correct chart version
    // Specify any values that you want to override.
    // For example, to setup the chart, you will need to provide the necessary configuration
    // such as the Slack webhook URL. Add the respective values in the `values` object.
    values: {
        // Insert your values configuration here for the Helm chart.
        // e.g.,
        // webhookUrl: "https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX",
    },
}, { provider });

// Step 3: Export the status URL of the deployment.
// Assuming that the slack-notifications chart results in creating a Kubernetes service,
// we will try to export the URL of that service.
// Note: Make sure the service created by the chart is of type LoadBalancer or has an external IP.
export const slackNotificationsUrl = slackNotificationsChart.getResourceProperty("v1/Service", "slack-notifications", "status").apply(status => status.loadBalancer.ingress[0].hostname || status.loadBalancer.ingress[0].ip);
```

To use this program:

1. Replace `<CHART_VERSION>` with the version number of the slack-notifications Helm chart you want to use.
2. Fill in the `values` field with appropriate values needed for the slack-notifications chart. This typically would include configuration like the Slack webhook URL.

Once you've set up your Pulumi program, you can deploy it using the following commands:

```sh
# Log in to Pulumi. This is typically needed the first time you use Pulumi.
pulumi login

# Initialize your Pulumi stack. A stack is an isolated, independently configurable instance of your Pulumi program.
pulumi stack init

# Deploy the program to your LKE cluster
pulumi up
```

This program will instruct Pulumi to deploy the specified version of the slack-notifications Helm chart to your LKE cluster with the configuration you provide. If successful, it will also export the URL of the Slack notifications service, assuming one is created by the chart.