Deploy the devlake helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the DevLake Helm chart on Linode Kubernetes Engine, you will follow these general steps:

1. **Provision a Kubernetes cluster**: You will use Pulumi to provision a Kubernetes cluster in Linode.
2. **Install Helm**: In a standard Kubernetes setup, you would need to install Helm on your machine to manage Kubernetes applications. However, with Pulumi, you can use the Helm support built into the Pulumi Kubernetes provider to manage Helm charts directly within your Pulumi program.
3. **Deploy Helm Chart**: You'll define a `Chart` resource in your program that references the DevLake Helm chart. The chart can be pulled directly from its Helm repository.

Here's a TypeScript program that carries out these steps with Pulumi:

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

const config = new pulumi.Config();
const clusterName = "devlake-cluster";

// Step 1: Create a Linode Kubernetes cluster
const cluster = new linode.LkeCluster(clusterName, {
    k8sVersion: "1.21", // Replace with a supported version on LKE
    region: "us-central", // Replace with your preferred Linode region
    pools: [{
        type: "g6-standard-2", // Replace with your preferred Linode instance type
        count: 3, // Number of nodes in the node pool
    }],
});

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

// Create a Kubernetes provider instance using the kubeconfig from the Linode cluster
const k8sProvider = new k8s.Provider("k8sProvider", {
    kubeconfig: cluster.kubeconfig,
});

// Step 2: Deploy the DevLake Helm chart onto the cluster using the Pulumi Kubernetes provider
const devLakeChart = new k8s.helm.v3.Chart("devlake", {
    chart: "devlake", // The name of the Helm chart
    version: "0.1.0", // Replace with the desired version of the chart
    fetchOpts: {
        repo: "https://charts.your-repo.com", // Replace with the Helm repository URL containing the DevLake chart
    },
}, { provider: k8sProvider });

// Export Helm chart status
export const helmChartStatus = devLakeChart.status;
```

This program performs the following actions:

- Imports the necessary Pulumi libraries to interact with Kubernetes, Linode, and handle configurations.
- Defines the cluster name and initializes a new Linode Kubernetes cluster using `linode.LkeCluster`.
  - You can set the Kubernetes version and region for your cluster.
  - It also configures the instance type and count for the nodes in your cluster's node pool.
- Exports the kubeconfig, which you can use to interact with your Kubernetes cluster using `kubectl`.
- Creates a Kubernetes provider that uses the kubeconfig from your newly created Linode cluster.
- Deploys the DevLake Helm chart by declaring a `Chart` resource. The `chart` argument specifies the name of the chart, and `fetchOpts.repo` specifies the location of the repository hosting the chart.

Make sure to replace placeholder strings such as `0.1.0` with the actual chart version and `https://charts.your-repo.com` with the actual Helm repository URL.

After deploying the cluster and chart, you can check the chart status using the exported `helmChartStatus` variable.

To run this Pulumi program, you would ensure you have Pulumi and Linode CLI tools set up, then execute `pulumi up` from the directory containing this code. It will prompt you for a confirmation before proceeding to provision the resources. After confirmation, Pulumi will create a new Kubernetes cluster in Linode and deploy the specified Helm chart.