Deploy the ublhub helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the `ublhub` Helm chart on Linode Kubernetes Engine using Pulumi, you'll need to perform the following steps:

1. Set up a new Pulumi project and install necessary dependencies.
2. Configure Pulumi to use the Linode provider.
3. Create a Linode Kubernetes cluster.
4. Deploy the `ublhub` Helm chart to the Linode Kubernetes cluster.

Below you'll find a detailed Pulumi program written in TypeScript that performs these steps. Make sure you have the Pulumi CLI installed and you are logged in to your Linode account. Additionally, you need to have `kubectl` installed to communicate with your Kubernetes cluster and Helm if you need any chart-specific local operations.

First, you will install the necessary dependencies:

```bash
# Install Pulumi CLI - https://www.pulumi.com/docs/get-started/install/
# Install Node.js and npm - https://nodejs.org/en/download/

# Create a new Pulumi project
pulumi new typescript

# Install Linode and Kubernetes Pulumi providers
npm install @pulumi/linode @pulumi/kubernetes
```

And here is the TypeScript program:

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

// Configure your Linode project - this assumes that the Linode token is available
// in the environment variable LINODE_TOKEN.
const linodeProvider = new linode.Provider('linode-provider', {
  token: process.env.LINODE_TOKEN,
});

// Create a new Linode Kubernetes cluster
const cluster = new linode.LkeCluster('lke-cluster', {
  k8sVersion: '1.20', // Specify the version of Kubernetes you want to use
  region: 'us-central',
  label: 'lke-cluster', // A unique label for the cluster
  tags: ['pulumi-cluster'],
  pool: {
    count: 2, // Number of nodes in the node pool
    type: 'g6-standard-2', // Type of nodes to launch (this is Linode's type identifier)
  },
}, { provider: linodeProvider });

// Export the kubeconfig to access your cluster
export const kubeconfig = cluster.kubeconfig;

// Create a Kubernetes provider using the kubeconfig from the Linode cluster
const k8sProvider = new k8s.Provider('k8s-provider', {
  kubeconfig: cluster.kubeconfig.apply(JSON.stringify),
});

// Deploy the ublhub Helm chart
const ublhubChart = new k8s.helm.v3.Chart('ublhub-chart', {
  chart: 'ublhub',
  fetchOpts: {
    repo: 'http://charts.ublhub.example.com/', // Replace with the actual Helm chart repo URL
  },
  // If the chart requires values, provide them in this object
  // values: {
  //   key: 'value',
  // },
}, { provider: k8sProvider });

// Exporting the chart name
export const chartName = ublhubChart.metadata.name;
```

### Explanation

- The `linode.LkeCluster` resource is used to create a Kubernetes cluster on Linode's Kubernetes Engine. You specify the Kubernetes version, region, label, and details of the node pool, such as the number of nodes and the node type.
  
- After creating the cluster, we export the `kubeconfig`. This allows you to interact with the cluster using `kubectl` from your local machine if necessary.
  
- We set up a `k8s.Provider` with the kubeconfig obtained from the Linode cluster. This provider is used to communicate with the Kubernetes cluster.
  
- The `ublhubChart` resource represents the Helm chart that we want to deploy. You need to replace the `repo` URL with the actual Helm repository where the `ublhub` chart is hosted. If the chart requires configuration values, they can be provided in the `values` object.

After writing this code into a `index.ts` file included in your Pulumi project, you can deploy it using the following Pulumi CLI commands:

```bash
# To preview the deployment
pulumi preview

# To deploy the stack
pulumi up
```

Now, your `ublhub` Helm chart should be deployed on the Linode Kubernetes cluster. Remember to manage the resources responsibly and destroy them when they're no longer needed:

```bash
# To destroy the resources
pulumi destroy
```

Always ensure you're within the project directory when executing these commands.