Deploy the simple-keycloak helm chart on Linode Kubernetes Engine

Question

Pulumi · Accepted Answer

To deploy the `simple-keycloak` Helm chart on Linode Kubernetes Engine (LKE) using Pulumi, you will first need to have a Kubernetes cluster set up in Linode. With Pulumi, you can do this by using the Linode Pulumi provider to provision the cluster and then deploy the Helm chart using the Kubernetes provider.

Let's start by setting up the LKE cluster. For this, we need to include the Linode Pulumi package in our `package.json` file and import it into our program. We'll define a new Kubernetes cluster instance with the desired configurations such as the region, node type, and the number of nodes.

Once the cluster is provisioned, we will obtain the kubeconfig of our newly created cluster to interact with it using Kubernetes commands. Pulumi also provides a Helm Chart resource, which we will utilize to deploy the `simple-keycloak` Helm chart to manage our Keycloak deployment.

Here is a step-by-step Pulumi program written in TypeScript to accomplish this:

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

// STEP 1: Provision a Linode Kubernetes Engine cluster
// Define the desired configuration for your LKE cluster.
const cluster = new linode.LkeCluster("my-cluster", {
    label: "my-cluster",
    k8sVersion: "1.20",
    region: "us-central",
    pool: {
        type: "g6-standard-2",
        count: 3,
    },
});

// STEP 2: Obtain the kubeconfig
// Once the cluster is provisioned, get the kubeconfig to interact with the cluster.
const kubeconfig = pulumi.all([cluster.id]).apply(([id]) => {
    return linode.getLkeClusterKubeconfig({ clusterId: id });
});

// STEP 3: Deploy the simple-keycloak Helm chart to the cluster
// Create a Provider to handle the Helm chart resources through the previously obtained kubeconfig
const provider = new k8s.Provider("k8s-provider", {
    kubeconfig: kubeconfig.rawConfig,
});

// Deploy the simple-keycloak Helm chart via the Pulumi Kubernetes provider
const keycloakChart = new k8s.helm.v3.Chart("simple-keycloak", {
    repo: "codecentric",           // The repository where the chart is located
    chart: "keycloak",             // Chart name, should be "keycloak" or suitable variant if "simple-keycloak" isn't found
    version: "11.0.1",             // Specify the chart version you want to deploy
    // Define the values for your Helm chart configuration here
    values: {
        keycloak: {
            // Values specific to the Keycloak deployment go here
        },
    },
}, { provider: provider });

// Export the Keycloak endpoint to access the Keycloak application
export const keycloakEndpoint = keycloakChart.getResourceProperty("v1/Service", "simple-keycloak", "status").apply(status => status.loadBalancer.ingress[0].ip);
```

This code block first sets up an instance of an LKE cluster with the specified settings. It then retrieves the kubeconfig needed to communicate with that cluster. After setting up the Kubernetes provider with this kubeconfig, it deploys the Simple Keycloak chart from the specified Helm repository.

The chart `version` and `values` provided in the code are for illustration purposes; please replace them with actual values suited to your needs, such as the correct chart and version. The Keycloak specific values usually include configurations such as admin username/password, persistence settings, service type, and resource limits. You'll need to consult the Keycloak Helm chart documentation for the exact values you require.

Once the deployment is complete, you can access the Keycloak service using the exported `keycloakEndpoint` IP address, which will be the external IP address assigned to the Keycloak service. You can use this endpoint to interact with the Keycloak UI or API.