Deploy the openethereum helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the OpenEthereum Helm chart on Linode Kubernetes Engine using Pulumi, we will follow these steps:

1. **Set up a Linode Kubernetes Engine (LKE) Cluster**: We'll start by creating a Kubernetes cluster on Linode. Pulumi allows you to define infrastructure as code using familiar programming languages. Below we'll use TypeScript as the language to do the setup.

2. **Install the Helm Chart**: Once the LKE cluster is up and running, we will install the OpenEthereum Helm chart. Helm is a package manager for Kubernetes, which allows us to deploy applications defined in Helm Charts. Charts are packages of pre-configured Kubernetes resources.

For this task, we will use the `kubernetes` package from Pulumi, which provides the required resources to set up a Kubernetes cluster and deploy a Helm chart on it.

Before using the code below, ensure that you have an account with Linode and have generated an API token with Kubernetes and LKE access. Also, install the Pulumi CLI and set up your Pulumi project following its [installation instructions](https://www.pulumi.com/docs/get-started/).

Here's the code that accomplishes our goal:

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

// Step 1: Set up a Linode Kubernetes Engine (LKE) Cluster
const cluster = new linode.LkeCluster("my-cluster", {
    k8sVersion: "1.18", // Specify your desired Kubernetes version
    region: "us-central", // Specify the Linode region
    tags: ["pulumi-cluster"], // Optional tags for organizing resources
    pool: [{
        count: 2, // Specify the number of nodes
        type: "g6-standard-2", // Specify the Linode instance type for nodes
    }],
});

// Obtain the kubeconfig for our cluster once it's available
const kubeconfig = pulumi
    .all([cluster.id])
    .apply(([id]) => linode.getLkeClusterKubeconfig({ clusterId: id }));

// Step 2: Deploy the OpenEthereum Helm chart
const helmChart = new kubernetes.helm.v3.Chart("openethereum", {
    repo: "openethereum", // The repository name where the chart is located
    chart: "openethereum", // The chart name to install
    // You can specify the values.yaml configuration for your chart as needed
    values: {
        // Example configuration values. You'll need to fill these out appropriately.
        // persistence: {
        //     size: "50Gi",
        // },
        // nodeSelector: {
        //     "beta.kubernetes.io/os": "linux",
        // },
        // resources: {
        //     requests: {
        //         cpu: "200m",
        //         memory: "256Mi",
        //     },
        // },
    },
}, { provider: new kubernetes.Provider("k8s-provider", { kubeconfig: kubeconfig }) });

// Stack exports
export const clusterName = cluster.id;
export const kubeconfigOutput = kubeconfig;
export const openethereumChartValues = helmChart.values;
```

This program performs the following actions:

- **Cluster Creation**: A new Linode Kubernetes cluster is instantiated with two nodes using the specified Linode instance type.
- **Helm Chart Deployment**: With the cluster ready, the program sets up a Helm chart for OpenEthereum using the specified repository and chart name. Some placeholder configurations are commented out, and you must customize these configurations based on your requirements, which are then passed on to the Helm chart.

**Please note**: The OpenEthereum Helm repository and the chart name must be correctly specified; the given values in the code are placeholders and might not reflect the current state of available Helm charts for OpenEthereum. You'll need to replace them with the correct values from the OpenEthereum Helm chart documentation. Also, the Kubernetes version and other settings need to be aligned with what is currently supported on Linode's Kubernetes service.

_Important Considerations_:
- Ensure that the names and versions of the OpenEthereum Helm chart are current and correct.
- Customize the `values` property of the `helm.v3.Chart` resource to provide the necessary configuration specific to OpenEthereum.
- Take into account that the Kubernetes version specified needs to be available in the Linode Kubernetes Engine at the time of creating this infrastructure.
- Be sure to handle the kubeconfig securely. It contains sensitive credentials to access your Kubernetes cluster.

After defining your infrastructure as code, deploy it by running `pulumi up` in the terminal from the location of your project. Pulumi will perform the diff, show you the proposed changes, and apply them when you confirm. This will create a new Linode Kubernetes cluster and deploy the OpenEthereum Helm chart on it.

Remember, the code is a direct expression of your infrastructure, and any changes should be applied through modifying the code and running `pulumi up` to apply the changes in a safe and repeatable manner.