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  2. Deploy Keycloak and NATS on Kubernetes

How do I deploy Keycloak and NATS on Kubernetes?

In this guide, we will deploy Keycloak and NATS on a Kubernetes cluster using Pulumi. Keycloak is an open-source Identity and Access Management solution, while NATS is a high-performance messaging system. We will define Kubernetes resources for both applications and deploy them to the cluster.

Keycloak and NATS Deployment on Kubernetes

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

// Define the namespace
const namespace = new k8s.core.v1.Namespace("keycloak-nats-ns", {
    metadata: {
        name: "keycloak-nats",
    },
});

// Deploy NATS
const natsDeployment = new k8s.apps.v1.Deployment("nats-deployment", {
    metadata: {
        namespace: namespace.metadata.name,
    },
    spec: {
        selector: { matchLabels: { app: "nats" } },
        replicas: 1,
        template: {
            metadata: { labels: { app: "nats" } },
            spec: {
                containers: [{
                    name: "nats",
                    image: "nats:latest",
                    ports: [{ containerPort: 4222 }],
                }],
            },
        },
    },
});

const natsService = new k8s.core.v1.Service("nats-service", {
    metadata: {
        namespace: namespace.metadata.name,
        labels: natsDeployment.spec.template.metadata.labels,
    },
    spec: {
        ports: [{ port: 4222, targetPort: 4222 }],
        selector: natsDeployment.spec.template.metadata.labels,
    },
});

// Deploy Keycloak
const keycloakDeployment = new k8s.apps.v1.Deployment("keycloak-deployment", {
    metadata: {
        namespace: namespace.metadata.name,
    },
    spec: {
        selector: { matchLabels: { app: "keycloak" } },
        replicas: 1,
        template: {
            metadata: { labels: { app: "keycloak" } },
            spec: {
                containers: [{
                    name: "keycloak",
                    image: "jboss/keycloak:latest",
                    ports: [{ containerPort: 8080 }],
                    env: [
                        { name: "DB_VENDOR", value: "h2" },
                        { name: "KEYCLOAK_USER", value: "admin" },
                        { name: "KEYCLOAK_PASSWORD", value: "admin" },
                    ],
                }],
            },
        },
    },
});

const keycloakService = new k8s.core.v1.Service("keycloak-service", {
    metadata: {
        namespace: namespace.metadata.name,
        labels: keycloakDeployment.spec.template.metadata.labels,
    },
    spec: {
        ports: [{ port: 8080, targetPort: 8080 }],
        selector: keycloakDeployment.spec.template.metadata.labels,
        type: "LoadBalancer",
    },
});

// Export the URLs for accessing Keycloak and NATS
export const natsServiceUrl = pulumi.interpolate`http://${natsService.metadata.name}.${namespace.metadata.name}.svc.cluster.local:4222`;
export const keycloakServiceUrl = pulumi.interpolate`http://${keycloakService.status.loadBalancer.ingress[0].ip}:8080`;

Key Points

  • We created a Kubernetes namespace for organizing the resources.
  • We deployed NATS using a Kubernetes Deployment and exposed it with a Service.
  • We deployed Keycloak using a Kubernetes Deployment and exposed it with a LoadBalancer Service.
  • We exported the URLs for accessing Keycloak and NATS.

Summary

In this guide, we deployed Keycloak and NATS on a Kubernetes cluster using Pulumi. We defined the necessary Kubernetes resources and exposed the services to be accessible. This setup provides a basic deployment of Keycloak and NATS, suitable for development and testing environments.

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