Deploy the stocks-nasdaq-crawler helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the `stocks-nasdaq-crawler` Helm chart on Linode Kubernetes Engine (LKE) using Pulumi, you'll first need to set up a Kubernetes cluster in Linode, install Pulumi, and configure it to manage resources on Linode using your API token. Then you'll create a Pulumi program that defines a Kubernetes cluster resource and deploys the Helm chart to this cluster.

Below is a Pulumi program written in TypeScript that demonstrates how to perform these tasks. The program uses the Pulumi Kubernetes package to interact with Kubernetes resources and deploy Helm charts.

The main components of this Pulumi program are:

1. **Linode Kubernetes Cluster**: This resource represents the Kubernetes cluster on Linode where the Helm chart will be deployed. We use the `linode` TypeScript package from Pulumi to create a Kubernetes cluster. The specific type or size of nodes can be adjusted according to your needs.

2. **Helm Chart**: This resource represents the `stocks-nasdaq-crawler` Helm chart. We will use the `@pulumi/kubernetes` package and the `Chart` resource to deploy this chart to our Linode Kubernetes Cluster.

In order to run the Pulumi program successfully, ensure you have the following prerequisites met:

1. A Linode account set up with an API token.
2. Install Pulumi and set up the Pulumi CLI.
3. Install Node.js and npm (or yarn) to execute the TypeScript program.
4. Configure Pulumi to use your Linode API token.

Once you have the prerequisites ready, you can proceed with the Pulumi code below:

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

// Create a Linode Kubernetes Engine (LKE) cluster
const cluster = new linode.LkeCluster("stocks-nasdaq-cluster", {
    region: "us-central", // Choose the appropriate region
    kubernetesVersion: "1.22", // Select the Kubernetes version
    labels: {
        "name": "stocks-nasdaq-cluster"
    },
    pools: [{
        type: "g6-standard-2", // Choose the appropriate instance type
        count: 3, // Number of nodes in the node pool
    }],
});

// Export the Kubeconfig
export const kubeconfig = cluster.kubeconfig;

// Set up a Kubernetes provider using the kubeconfig from Linode cluster
const k8sProvider = new kubernetes.Provider("k8sProvider", {
    kubeconfig: cluster.kubeconfig,
});

// Deploy the stocks-nasdaq-crawler Helm chart
const stocksNasdaqCrawlerChart = new kubernetes.helm.v3.Chart("stocks-nasdaq-crawler", {
    chart: "stocks-nasdaq-crawler",
    // Add the repository if it's not from the default Helm repo
    fetchOpts: {
        repo: "http://example.com/path/to/repo", // Replace with the Helm chart's repo URL
    },
    // Define any custom values you wish to override
    values: {
        // Example: If the chart required specifying a namespace or any other parameters
        // namespace: "default",
        // replicaCount: 1,
    },
}, { provider: k8sProvider });

// Export the endpoint of the stocks-nasdaq-crawler service
export const crawlerServiceEndpoint = stocksNasdaqCrawlerChart.getResourceProperty("v1/Service", "stocks-nasdaq-crawler", "status").apply(status => status.loadBalancer.ingress[0].ip);

```
In this code:

1. We've declared a variable called `cluster` of type `Linode.LkeCluster`. This defines the specs of your Linode Kubernetes Engine cluster, such as the region, Kubernetes version, labels, and details about your node pools.

2. We export `kubeconfig` from the cluster, which contains the configuration needed for kubectl to connect to the Kubernetes cluster.

3. We create a Pulumi Kubernetes `Provider`, which is responsible for deploying Kubernetes resources to the given cluster. It is configured using the `kubeconfig` generated by Linode.

4. We define the `stocks-nasdaq-crawler` Helm chart using the `kubernetes.helm.v3.Chart` resource. We've specified a placeholder URL for `repo`, which should be replaced with the actual Helm chart's repository. You may also specify custom values as needed by your Helm chart.

5. The last line exports the service endpoint IP for the `stocks-nasdaq-crawler` so you can access it once it's deployed. Note that this assumes that your service type in the Helm chart is set up to use a LoadBalancer; if it uses another type (like a ClusterIP or NodePort), you would have to fetch the appropriate information from the service status.

After crafting this TypeScript code, save it in a file (e.g. `index.ts`) and then run the following commands to deploy your infrastructure:

```bash
# Install the necessary Pulumi packages
npm install @pulumi/linode @pulumi/kubernetes

# Log in to Pulumi
pulumi login

# Create a new project directory, if needed
mkdir linode_k8s_stocks_crawler && cd linode_k8s_stocks_crawler

# Initialize a new Pulumi project
pulumi new typescript

# Replace the contents of index.ts with the above TypeScript code

# Install the dependencies defined in the package.json file
npm install

# Preview the changes that will be made by running the Pulumi program
pulumi preview

# Deploy the changes to Linode
pulumi up

# After successful deployment, you can access the crawlerServiceEndpoint output
```

Remember to replace placeholders and adjust parameters as per your requirements, such as the Helm chart repository URL and any custom values needed for the `stocks-nasdaq-crawler` chart.