Using kubernetes k8s.keycloak.org with app.redislabs.com

Question

Pulumi · Accepted Answer

To integrate Keycloak with Kubernetes and Redis (provided by Redis Labs), you'll need to deploy a Keycloak instance within a Kubernetes cluster and configure it to use Redis as its caching layer.

First, let's discuss deploying Keycloak on Kubernetes. Keycloak requires a database to store its data and Redis is typically used as a caching layer to enhance performance. Make sure you already have a Kubernetes cluster running.

Secondly, we'll need to set up Redis. Redis Labs offers Redis as a service, which can be configured with Keycloak for caching purposes once you have obtained the necessary connection details from your Redis Labs dashboard.

Now, let's break down the steps you'll need to follow in the Pulumi program:

1. Deploy Keycloak on Kubernetes:
   - You'll create a Keycloak instance using a Kubernetes Deployment.
   - Set up a Service to expose Keycloak.

2. Configure Keycloak to use Redis:
   - You'll create ConfigMaps and Secrets to hold your Redis configuration and credentials.
   - Pass the Redis connection details to Keycloak using environment variables.

Please note that the following program assumes you have the necessary Docker image for a Keycloak server that is pre-configured to communicate with Redis. Additionally, it assumes you have the connection details for your Redis instance from Redis Labs (`REDIS_HOST`, `REDIS_PORT`, and `REDIS_PASSWORD`).

Let's now provide the Pulumi TypeScript code that sets up Keycloak on Kubernetes and configures it to use an external Redis service:

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

// Example values for Redis connection details
// You should replace these with your actual Redis configuration from Redis Labs.
const redisConfig = {
    host: "your-redis-host",
    port: "your-redis-port",
    password: "your-redis-password"
};

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

// Create a ConfigMap to hold the Redis configuration for Keycloak
const redisConfigMap = new k8s.core.v1.ConfigMap("redis-config", {
    metadata: {
        namespace: ns.metadata.name,
    },
    data: {
        REDIS_HOST: redisConfig.host,
        REDIS_PORT: redisConfig.port
    }
}, { dependsOn: [ns] });

// Create a Secret to hold the Redis credentials
const redisSecret = new k8s.core.v1.Secret("redis-secret", {
    metadata: {
        namespace: ns.metadata.name,
    },
    stringData: {
        REDIS_PASSWORD: redisConfig.password
    }
}, { dependsOn: [ns] });

// Deploy Keycloak using a Deployment
const keycloakDeployment = new k8s.apps.v1.Deployment("keycloak-deployment", {
    metadata: {
        namespace: ns.metadata.name,
    },
    spec: {
        replicas: 1,
        selector: { matchLabels: { app: "keycloak" } },
        template: {
            metadata: {
                labels: { app: "keycloak" }
            },
            spec: {
                containers: [{
                    name: "keycloak",
                    image: "your-keycloak-image-with-redis", // replace with your prepared Keycloak image
                    ports: [{ containerPort: 8080 }],
                    envFrom: [
                        // Define environment variables from the ConfigMap
                        { configMapRef: { name: redisConfigMap.metadata.name } },
                        // Define environment variables from the Secret
                        { secretRef: { name: redisSecret.metadata.name } }
                    ],
                    // other necessary environment variables and configuration
                }],
                // other necessary specs
            },
        },
    },
}, { dependsOn: [redisConfigMap, redisSecret] });

// Expose Keycloak through a Service
const keycloakService = new k8s.core.v1.Service("keycloak-service", {
    metadata: {
        namespace: ns.metadata.name,
    },
    spec: {
        type: "LoadBalancer",
        selector: { app: "keycloak" },
        ports: [{ port: 80, targetPort: 8080 }]
    }
}, { dependsOn: [keycloakDeployment] });

// Export the Keycloak external endpoint
export const keycloakEndpoint = keycloakService.status.loadBalancer.ingress[0].hostname;
```

In this program:

- We use a custom Keycloak Docker image that's prepared to work with Redis (`your-keycloak-image-with-redis`). You will need to create or obtain an image that has the necessary configurations to utilize Redis for caching.
- A `ConfigMap` and a `Secret` are created to manage the Redis configuration and credentials.
- The Keycloak `Deployment` references the `ConfigMap` and `Secret` to configure the Keycloak instance with the Redis server's connection details.
- A `Service` of type `LoadBalancer` is used to expose Keycloak externally so that it's accessible over the internet.

Remember to replace placeholders (`your-redis-host`, `your-redis-port`, `your-redis-password`, and `your-keycloak-image-with-redis`) with actual values before running this program.

After deploying this Pulumi program, you should have Keycloak running in your Kubernetes cluster and connected to Redis from Redis Labs for caching. You can access Keycloak using the endpoint URL exported by the program.