Deploy the openfunction helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the OpenFunction Helm chart on the Linode Kubernetes Engine using Pulumi, you'll first need to create a Kubernetes cluster on Linode, assuming you don't have one already. Once you have a cluster, you can use the Pulumi Kubernetes provider to deploy the Helm chart.

Here is a step-by-step approach to achieve this:

1. **Create a Kubernetes Cluster**: Start by creating a cluster on the Linode Kubernetes Engine using Pulumi. For that, you can use the Linode provider for Pulumi which provides `linode.LkeCluster` resource to create a cluster.

2. **Configure Kubernetes Provider**: Once the cluster is up and running, you would retrieve the kubeconfig from the created cluster, which will be used to configure the Kubernetes provider so that Pulumi can communicate with your Kubernetes cluster.

3. **Deploy the Helm Chart**: After setting up the provider, you would use the `kubernetes.helm.v3.Chart` resource to deploy the OpenFunction Helm chart to your Linode Kubernetes cluster.

Now, let's translate this plan into a Pulumi program written in TypeScript:

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

// Step 1: Create a Kubernetes cluster on Linode.
const cluster = new linode.LkeCluster("openfunction-cluster", {
    k8sVersion: "1.22",
    region: "us-central",
    nodePools: [{
        count: 2, // Number of nodes you want in your node pool
        type: "g6-standard-1", // Type of Linode instance for your nodes
    }],
});

// Step 2: Retrieve the kubeconfig.
const kubeConfig = pulumi.all([cluster.id, cluster.kubeconfig]).apply(([_, kubeconfig]) => {
    return kubeconfig.rawConfig;
});

// Step 3: Configure Kubernetes provider with the kubeconfig from the cluster.
const k8sProvider = new kubernetes.Provider("k8s-provider", {
    kubeconfig: kubeConfig,
});

// Step 4: Deploy the OpenFunction Helm chart.
const openFunctionChart = new kubernetes.helm.v3.Chart("openfunction", {
    chart: "openfunction",
    version: "0.4.0", // Specify the version of OpenFunction you wish to deploy
    namespace: "default", // Specify the namespace where to install the chart
    fetchOpts:{
        repo: "https://openfunction.github.io/charts/", // Helm repository where the OpenFunction chart is stored
    },
}, { provider: k8sProvider });

// Export the kubeconfig and public IP to access OpenFunction.
export const kubeconfig = kubeConfig;
export const endpoint = cluster.endpoint;
```
Please note the following details in the above TypeScript code:

- Make sure to replace `"1.22"` with the version of Kubernetes available in Linode Kubernetes Engine that you wish to use.
- Adjust the `nodePools` array according to the size and number of nodes you need.
- The OpenFunction Helm chart version `"0.4.0"` is specified as an example; replace it with the version you wish to deploy.
- The Helm chart is installed in the `default` namespace in this example, but you can specify any other namespace as needed.
- The repository URL is where the Helm chart for OpenFunction is stored; modify it if you have a different source.

Before running this Pulumi program, ensure you have the necessary Pulumi and Linode CLI setup and authenticated with your Linode account. Also, ensure you have the appropriate permissions and the Linode provider installed.

After deploying, you can use the exported `kubeconfig` to manage your Kubernetes cluster, and the `endpoint` to interact with the OpenFunction deployment.