One post tagged with "AKS"

Kubernetes has become a go-to solution for deploying microservices and managing containerized applications. In this blog, we will walk through a real-world demo of how to deploy a Node.js app on Azure Kubernetes Service (AKS), referencing the hands-on transcript and official Microsoft Docs.

Introduction​

Kubernetes lets you deploy web apps, data-processing pipelines, and backend APIs on scalable clusters. This walkthrough will guide you through:

1. Preparing the app
2. Building and pushing to Azure Container Registry (ACR)
3. Creating the AKS cluster
4. Deploying the app
5. Exposing it to the internet

🧱 Step 1: Prepare the Application​

Start by organizing your code and creating a Dockerfile:

FROM node:18
WORKDIR /app
COPY package*.json ./
RUN npm install
COPY . .
EXPOSE 80
CMD ["node", "app.js"]

For the setup we'll use code from repo: https://github.com/Azure-Samples/aks-store-demo. Clone the code and navigate to the directory.

The sample application you create in this tutorial uses the docker-compose-quickstart YAML file from the repository you cloned.

if you get error:

error during connect: Get "http://%2F%2F.%2Fpipe%2FdockerDesktopLinuxEngine/v1.46/containers/json?all=1&filters=%7B%22label%22%3A%7B%22com.docker.compose.config-hash%22%3Atrue%2C%22com.docker.compose.project%3Daks-store-demo%22%3Atrue%7D%7D": open //./pipe/dockerDesktopLinuxEngine: The system cannot find the file specified.

ensure that your docker desktop is running.

📦 Step 2: Create a resource group using the az group create command​

Open Cloud Shell

az group create --name arinarg --location eastus

📦 Step 2: Build and Push to Azure Container Registry​

Create your Azure Container Registry:

az acr create --resource-group arinarg --name arinaacrrepo --sku Basic

Login and build your Docker image directly in the cloud:

az acr login --name arinaacrrepo
az acr build --registry arinaacrrepo --image myapp:v1 .

📦 **Step 3: Build and push the images to your ACR using the Azure CLI az acr build command.​

az acr build --registry arinaacrrepo --image aks-store-demo/product-service:latest ./src/product-service/
az acr build --registry arinaacrrepo --image aks-store-demo/order-service:latest ./src/order-service/
az acr build --registry arinaacrrepo --image aks-store-demo/store-front:latest ./src/store-front/

This step creates and stores the image at:
arinaacrrepo.azurecr.io/

☸️ Step 4: Create the AKS Cluster​

Use the following command:

az aks create --resource-group arinarg --name myAKSCluster --node-count 1 --enable-addons monitoring --generate-ssh-keys --attach-acr arinaacrrepo

Then configure kubectl:

az aks get-credentials --resource-group arinarg --name myAKSCluster

🚀 Step 4: Deploy the App​

Now apply the Kubernetes manifest:

# deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deployment
spec:
  replicas: 2
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: myapp
        image: arinaacrrepo.azurecr.io/myapp:v1
        ports:
        - containerPort: 80

Apply it:

kubectl apply -f deployment.yaml

🌐 Step 5: Expose the App via LoadBalancer​

We will use a LoadBalancer to expose the service to the internet...

# service.yaml
apiVersion: v1
kind: Service
metadata:
  name: myapp-service
spec:
  type: LoadBalancer
  selector:
    app: myapp
  ports:
  - protocol: TCP
    port: 80
    targetPort: 80

Apply it:

kubectl apply -f service.yaml

Get the external IP:

kubectl get service myapp-service

Open the IP in your browser, and your app should now be live!

📝 Conclusion​

Kubernetes on Azure is powerful and accessible. You've just deployed a containerized Node.js app to AKS, with best practices for build, deploy, and scale.

🔚 Call to Action​

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