Deploy the keycloak-resources deployment for keycloak-operator helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy the `keycloak-resources` for the `keycloak-operator` Helm chart on Kubernetes using Pulumi, you'll first need to set up your Pulumi environment to work with the Kubernetes provider. This will involve writing a program that uses the `@pulumi/kubernetes` package to instantiate the Helm chart within your Kubernetes cluster.

The Pulumi Kubernetes provider allows you to write infrastructure code in familiar programming languages such as TypeScript, Python, Go, and others, which is then used to communicate with your Kubernetes cluster and create, update, or delete resources as if you were using `kubectl`.

For your specific use case, you will be utilizing the `Chart` resource from Pulumi's Kubernetes provider. This resource allows you to deploy Helm charts into your cluster. Helm is a package manager for Kubernetes which packages multiple Kubernetes resources into a single logical deployment unit called a "chart".

Before proceeding, you need to have the following prerequisites in place:
- A configured Kubernetes cluster
- `kubectl` configured to connect to your cluster
- Pulumi CLI installed and set up to manage resources in your cluster
- Node.js and npm installed for running the TypeScript program

Below is a TypeScript program that defines a Pulumi project to deploy the `keycloak-operator` Helm chart with its `keycloak-resources` deployment.

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

// A Pulumi project usually involves creating a stack where all resources belong.
// Here we instantiate a Helm chart from the 'keycloak-operator' repository.

// Define the Helm chart for the keycloak-operator, attaching necessary keycloak-resources configuration if any.
const keycloakOperatorChart = new k8s.helm.v3.Chart("keycloak-resources", {
    chart: "keycloak-operator",
    // Replace with the correct Helm repository URL that hosts your desired chart.
    repo: "https://codecentric.github.io/helm-charts", 
    version: "15.1.0", // Specify the version of the chart you wish to deploy
    namespace: "default", // Specify the namespace where you want to deploy the chart
    // If the chart requires any values to configure Keycloak resources, specify them here.
    values: {
        // values to configure your Keycloak resources
    },
    // In a real-world scenario, you'd want to customize the deployment with specific values.
    // The values structure should mirror what you would write in a values.yaml file.
    // For example:
    // values: {
    //   keycloak: {
    //     username: "admin",
    //     password: "admin",
    //     // Additional Keycloak configuration here...
    //   },
    //   // Additional chart configuration here...
    // },
});

// Export the status URL of the deployed Keycloak operator
export const keycloakOperatorStatusUrl = keycloakOperatorChart.getResourceProperty("v1/Service", "keycloak-operator-http", "status.loadBalancer.ingress[0].hostname");

// To run this program, you will need to execute `pulumi up` in your CLI.
// This command will start the deployment process by communicating with your Kubernetes cluster,
// and the resources defined in this program will be created accordingly.
```

In the above program, we create a new `Chart` resource, which is Pulumi's representation of a Helm chart. We specify the name of the chart, the Helm repository where the chart is located, and the version of the chart. We also set the `namespace` to which the chart should be deployed.

To customize the deployment, we would add specific values to the `values` field of the `Chart` configuration. This field receives an object that contains the configuration values that overwrite the defaults provided by the Helm chart; it represents the `values.yaml` file you would typically use with Helm.

The last line of the program exports the status URL of the deployed Keycloak operator, but please note that this export assumes that your service is exposed via a LoadBalancer and you have an ingress hostname. You would adjust this based on your specific exposure and access methods.

To apply this program:
1. Save the code to a file with a `.ts` extension, for example, `index.ts`.
2. Run `npm init -y` in the directory with your `index.ts` to create a `package.json` file.
3. Run `npm install @pulumi/pulumi @pulumi/kubernetes` to install the necessary Pulumi libraries.
4. Run `pulumi up` to preview and deploy the resources. This command lets Pulumi perform the deployment, creating the necessary resources on your Kubernetes cluster.

Remember that you must have Pulumi configured with access to your Kubernetes cluster for this to work. Pulumi uses the current context in your `kubeconfig` file to communicate with your Kubernetes cluster. Ensure that your context is set to the correct cluster where you want to deploy Keycloak.