Using Kubernetes Nats With Certmanager

Introduction

In this guide, we will deploy a NATS server on a Kubernetes cluster using Pulumi. We will also use Cert-Manager to manage TLS certificates for secure communication. NATS is a high-performance messaging system, and Cert-Manager is a Kubernetes add-on to automate the management and issuance of TLS certificates.

Step-by-Step Explanation

Step 1: Set up the Pulumi Project

1. Initialize a new Pulumi project.
2. Install the necessary Pulumi packages for Kubernetes and Cert-Manager.

Step 2: Deploy Cert-Manager

1. Create the necessary Kubernetes namespace for Cert-Manager.
2. Deploy Cert-Manager using a Helm chart.

Step 3: Deploy NATS

1. Create a Kubernetes namespace for NATS.
2. Deploy NATS using a Helm chart.
3. Configure NATS to use the certificates managed by Cert-Manager.

Step 4: Verify the Deployment

1. Check the status of the Cert-Manager and NATS deployments.
2. Ensure that the NATS server is using the TLS certificates issued by Cert-Manager.

Conclusion

By following these steps, you have successfully deployed a NATS server on a Kubernetes cluster with TLS certificates managed by Cert-Manager. This setup ensures secure communication for your NATS messaging system.

Full Code Example

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

// Create a Kubernetes namespace for Cert-Manager
const certManagerNamespace = new k8s.core.v1.Namespace("cert-manager-namespace", {
    metadata: { name: "cert-manager" },
});

// Deploy Cert-Manager using a Helm chart
const certManager = new k8s.helm.v3.Chart("cert-manager", {
    chart: "cert-manager",
    version: "v1.5.4",
    fetchOpts: {
        repo: "https://charts.jetstack.io",
    },
    namespace: certManagerNamespace.metadata.name,
    values: {
        installCRDs: true,
    },
});

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

// Deploy NATS using a Helm chart
const nats = new k8s.helm.v3.Chart("nats", {
    chart: "nats",
    version: "0.8.0",
    fetchOpts: {
        repo: "https://nats-io.github.io/k8s/helm/charts",
    },
    namespace: natsNamespace.metadata.name,
    values: {
        nats: {
            tls: {
                enabled: true,
                secret: {
                    name: "nats-tls",
                    cert: "tls.crt",
                    key: "tls.key",
                },
            },
        },
    },
});

// Export the namespaces
export const certManagerNamespaceName = certManagerNamespace.metadata.name;
export const natsNamespaceName = natsNamespace.metadata.name;