Building a Messaging System with NATS, Golang, and Azure Kubernetes Service
This article walks you through building a messaging system with NATS (an acronym for Neural Autonomic Transport System) and Golang deployed in Azure Kubernetes Service (AKS). NATS is an open-source messaging system. Written in the Go programming language. NATS has a core publish-subscribe server designed for performance, scalability, and ease of use.
- Go (version
1.16or later): We’ll use Go to write our publisher and subscriber applications.
- Docker: We’ll use Docker to build and package our Go applications.
- Kubernetes CLI (
kubectl): We’ll use kubectl to interact with our Kubernetes cluster.
- Helm: We’ll use Helm to deploy NATS on our Kubernetes cluster.
You’ll also need access to an Azure Kubernetes Service (AKS) cluster. If you haven’t already, follow the Azure documentation to create an AKS cluster.
Table of Contents:
- Deploying NATS on Azure Kubernetes Service
- Creating a Go Publisher and Subscriber
- Running the Go Applications in Kubernetes
- Deploying to Kubernetes and Testing
Deploying NATS on Azure Kubernetes Service
First, we’ll deploy a NATS server on our AKS cluster. We can do this easily using Helm, a package manager for Kubernetes. With Helm installed and your, AKS cluster up and running, execute the following commands to add the NATS Helm chart repo and install NATS:
Helm will deploy a NATS server on your AKS cluster.
Creating a Go Publisher and Subscriber
Next, we’ll create a publisher and a subscriber application using Go. The publisher will publish messages to a NATS subject, and the subscriber will subscribe to this subject to receive these messages. Here’s a simple example of a publisher in the
And a subscriber in the
Running the Go Applications in Kubernetes
Now we will containerize our Go applications using Docker. Here’s a basic
Dockerfile for our Go applications:
Build Docker images for both applications, tag them, and push them to a Docker registry. Here’s how you might do it:
Remember to replace
myregistry with the name of your Docker registry.
Deploying to Kubernetes and Testing
With our Docker images pushed to the registry, we can now deploy our applications to Kubernetes. We’ll create a deployment for each application, creating a pod for each.
Finally, we can test our setup by publishing a message. We should see this message appear in the logs of our subscriber:
In this guide, we built a messaging system using NATS, Golang, and Azure Kubernetes Service. We deployed a NATS server onto AKS, made Golang publisher and subscriber applications, packaged them as Docker containers, and ran them on AKS. This guide is a basic introduction to NATS, Golang, and AKS. Feel free to expand upon this guide to build more complex systems tailored to your needs.
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