Using kubernetes linkerd.io with k8s.keycloak.org

Question

Pulumi · Accepted Answer

Certainly! To integrate Linkerd with Keycloak on a Kubernetes cluster using Pulumi, you would typically take the following steps:

1. Install Linkerd on the Kubernetes cluster to add automatic observability, security, and reliability features to your services.
2. Deploy Keycloak, an open-source identity and access management solution, on the Kubernetes cluster.
3. Configure Keycloak for your services' authentication and authorization needs.

For this use case, Pulumi relies on the `@pulumi/kubernetes` package for creating and managing Kubernetes resources. While Pulumi does not have a dedicated package for Linkerd, you can deploy it using the raw Kubernetes resources provided by the Linkerd installation YAMLs, or by using Helm charts. Similarly, Keycloak can be deployed either using raw YAMLs or their Helm chart equivalent.

Here's a Pulumi program written in TypeScript that describes the general steps of deploying Linkerd and Keycloak into a Kubernetes cluster. Please note that for a real-world scenario, you would need to adjust parameters like namespaces, configurations, storage options, etc., to your specific needs.

Before you start, ensure you have Pulumi installed, Kubernetes set up (either a local cluster like minikube or a cloud-based one like GKE, EKS, AKS, etc.), and `kubectl` is configured to interact with your Kubernetes cluster.

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

const name = 'linkerd-keycloak-demo';

// Create a Kubernetes namespace for the Linkerd control plane.
const linkerdNamespace = new k8s.core.v1.Namespace('linkerd-ns', {
    metadata: {
        name: 'linkerd',
    },
});

// Install Linkerd using a Helm chart.
// This is a simplified example; you might need to add more configuration options.
const linkerdChart = new k8s.helm.v3.Chart('linkerd', {
    chart: 'linkerd2',
    version: 'stable-2.11.1', // Use the correct version for your use case
    namespace: linkerdNamespace.metadata.name,
    fetchOpts: {
        repo: 'https://helm.linkerd.io/stable',
    },
}, { dependsOn: [linkerdNamespace] });

// Create a namespace for Keycloak.
const keycloakNamespace = new k8s.core.v1.Namespace('keycloak-ns', {
    metadata: {
        name: 'keycloak',
    },
});

// Deploy Keycloak using the Bitnami Keycloak Helm chart.
// This is a simplified example; you'll likely need to provide custom values
// for storage, admin passwords, clustering, etc.
const keycloakChart = new k8s.helm.v3.Chart('keycloak', {
    chart: 'keycloak',
    version: '15.0.2', // Use the correct version for your use case
    namespace: keycloakNamespace.metadata.name,
    fetchOpts: {
        repo: 'https://charts.bitnami.com/bitnami',
    },
    values: { // Make sure to specify appropriate values for your setup
        service: {
            type: 'ClusterIP',
        },
        // Enable persistence and configure storage options appropriately
        persistence: {
            enabled: true,
            size: '10Gi',
        },
    },
}, { dependsOn: [keycloakNamespace] });

// To view these services in the Pulumi output, we export their names.
export const linkerdNamespaceName = linkerdNamespace.metadata.name;
export const keycloakNamespaceName = keycloakNamespace.metadata.name;
```

This program sets up both Linkerd and Keycloak using their respective Helm charts. Helm charts abstract the complexity of the deployment and condense it into manageable configurations.

The `linkerdChart` and `keycloakChart` are instances of `k8s.helm.v3.Chart`, which tell Pulumi to install these applications via Helm. The `dependsOn` option makes sure that namespaces are created before the charts are deployed.

After running the Pulumi program to completion, you should have both Linkerd and Keycloak running in their respective namespaces.

To apply the Pulumi code, you would run `pulumi up` from the command line in the directory where this code is saved (`index.ts` for TypeScript).

Please ensure that you carefully review and understand any Helm chart values you might use and adapt the deployment specs to suit your security, reliability, and cluster requirements.