Deploy the simple-keycloak helm chart on Kubernetes

Question

Pulumi · Accepted Answer

To deploy a Helm chart for Keycloak (assuming it's called `simple-keycloak`) on a Kubernetes cluster using Pulumi, you can utilize the `Chart` resource from the `@pulumi/kubernetes` package. Helm charts are a great way to package and deploy applications on Kubernetes, and Pulumi leverages this by providing a programmatic interface for chart management.

The `Chart` resource allows you to deploy, configure, and manage Helm charts just like you would with the `helm` CLI, enabling you to define your infrastructure as code in a more high-level and descriptive manner using familiar programming languages.

Below, you'll find a Pulumi program written in TypeScript that deploys the `simple-keycloak` Helm chart to an existing Kubernetes cluster.

**Please note that you need to replace `"my-kubeconfig"` with your actual kubeconfig file or ensure your environment is set up to connect to your Kubernetes cluster.**

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

// Create an instance of the Helm Chart for simple-keycloak.
const keycloakChart = new kubernetes.helm.v3.Chart("simple-keycloak", {
    chart: "simple-keycloak",
    // You normally specify the repository where the chart is located.
    // For the `simple-keycloak` chart, you'd replace this with the actual repository URL or name.
    // Example: repo: "https://charts.bitnami.com/bitnami"
    fetchOpts: {
        repo: "http://chart-repository.url/or/name",
    },
    // If your chart requires any custom values, you can specify them using the `values` field.
    // Below is an example and may not be representative of the actual values your chart requires.
    values: {
        service: {
            type: "ClusterIP",
        },
        // More custom values for the simple-keycloak chart as necessary...
    },
    // Specify the namespace if you want to deploy the chart into a specific one, defaults to 'default'.
    namespace: "keycloak-namespace",
    // The following transformation adds a label to all resources that this Chart creates.
    transformations: [
        (resource) => {
            if (resource.metadata) {
                resource.metadata.labels = {...resource.metadata.labels, "managed-by": "pulumi"};
            }
        }
    ],
});

export const keycloakEndpoint = keycloakChart.getResourceProperty("v1/Service", "simple-keycloak", "status");
```

Let's break down the components of this code:

- We import the `@pulumi/kubernetes` package which contains the necessary components to interact with Kubernetes.
- We then declare a variable `keycloakChart` and instantiate `kubernetes.helm.v3.Chart` with the name `"simple-keycloak"`, which corresponds to the name of the Helm chart we wish to deploy.
- We specify the `chart` name and provide the `fetchOpts.repo` option with a placeholder URL where the chart's repository is hosted.
- We use the `values` field to provide any custom values needed to configure Keycloak. The values you need will depend on the specifics of the chart and what configuration it exposes; this example assumes a simple `service` configuration.
- We optionally set a `namespace` where our Keycloak instance should be deployed.
- We apply a `transformation`, which is a Pulumi feature allowing us to modify the Kubernetes manifests before they are applied. In this case, we're adding an extra label to all created resources.
- Finally, we export the `keycloakEndpoint` which attempts to fetch the `status` property of the Keycloak service after it's deployed. This can be used to obtain the endpoint of your deployed Keycloak instance.

Note that the above Pulumi program must be part of a larger Pulumi project, and you should have the Pulumi CLI installed and configured for use with your Kubernetes cluster. The code assumes that you have the necessary Kubernetes configuration (such as a `kubeconfig` file) already set up, and it assumes you have permissions to deploy resources to the cluster.

To run this Pulumi program:

1. Ensure you have Node.js and Pulumi installed.
2. Create a new directory for your Pulumi project.
3. Run `pulumi new typescript` inside the directory.
4. Replace the contents of `index.ts` with the code provided above.
5. Install the necessary dependencies by running `npm install @pulumi/kubernetes`.
6. Run `pulumi up` to deploy the Helm chart to your cluster.

After deployment is successful, you can access your Keycloak instance using the endpoint exported by the program. For production use, you will need to ensure your chart values are configured correctly for your environment, and you should review all security settings.