Deploy Java Microservices to Azure Kubernetes with Azure DevOps (CI+CD )

Pre-Requisite:

Azure Account

Docker

Kubernetes file

ACR Set Up

Azure Kubernetes Cluster

kubectl

Azure DevOps Dashboard setup

Steps

====

1. Create Azure Kubernetes Cluster

login to azure portal

az login

Create a resource group

az group create --name myResourceGroup --location southcentralus

Create a AKS Cluster with 2 worker node

az aks create --resource-group myResourceGroup --name myAKSCluster --node-count 2

Display cluster details

az aks show --name myAKSCluster --resource-group myResourceGroup

Create a Azure Container Registry (ACR)

az acr create --resource-group myResourceGroup --name myacrrepo4321 --sku Standard --location southcentralus

Connect to Cluster

 az aks get-credentials --resource-group myResourceGroup --name myAKSCluster --overwrite-existing

Verify connect to cluster

kubectl get nodes

kubectl get deployments --all-namespaces=true

Please make sure that you have access to AzureDevOps pipeline

docker file is created

Make sure that AKS has pull access from ACR

When you're using Azure Container Registry (ACR) with Azure Kubernetes Service (AKS), an authentication mechanism needs to be established. 

You can set up the AKS to ACR integration in a few simple commands with the Azure CLI or Azure PowerShell. This integration assigns the AcrPull role to the managed identity associated to the AKS Cluster.

For Deploying Docker images from ACR into AKS Cluster 

az aks update -n myAKSCluster -g myResourceGroup --attach-acr myacrrepo4321

modify deployment files with updated image tag

Set Up DevOps Pipeline

1.set up build pipeline

2. set up release pipeline

Set up build pipeline

Step 1 - How to create a Azure Build Pipeline

1. Login into your Azure DevOps dashboard

2. Click on Pipelines.

3. Click on New Pipeline

4. Click on use the classic editor

Enter your repo name and branch name where you have stored your source code along with Dockerfile:

Click on Continue. Now choose the template by typing Docker, Select Docker container and Apply.

Now pipeline is created with two tasks already. We need to more tasks:

Let's add Maven build task for building the JAR file.

Click on + icon and type Maven

And then enter maven goal as package

Let's modify Build an image task.

Select Push an image task

Add a task for Copying YAML file, enter the Kubernetes deployment YAML file - 

aks-deploy-from-acr.yaml

Add Publish artifact task

Now click Save + Queue and run to start Building the pipeline

Once the build is completed, you should be able to see the Docker images under 

Services --> Repositories

Release Pipeline

How to Create Release pipeline for deploying Docker containers into AKS Cluster 

Go to Pipelines --> Click on Releases --> New Release pipeline

Click on Stage 1 and choose a template by selecting

Deploy to a Kubernetes cluster and click on Apply

Change the stage name to Deploy to AKS

Now click on Add an artifact

Select the Build pipeline and click on the latest version

Now click on Deploy to AKS stage

Add Replace token task

Click on + to add task, type token and choose replace token task. 

Now click on replace token task and Clik on root directory, click on ... dots

 select the drop directory from below:

and enter Target file as  aks-deploy-from-acr.yaml

Click on kubectl apply

Now Click on New to enter AKS cluster connection info

Choose the Azure subscription and enter Microsoft user credentials.

Select AKS cluster from the drop down, choose default namespace

Choose command as apply and select the yaml file from the dropdown from Configuration file 

Now click on Save,

Click on Create a release

and then click Create to run the deployment

Click on Stage to see the logs

Now you will see the following tasks are in green to confirm Deployment was successful.

Let's check if deployment created any pods

kubectl get deployments

kubectl get pods

kubectl get svc

Now try to access spring boot application running inside AKS cluster by using external IP and port number

If you see any errors after deploying the pods, you can check the pod logs.

kubectl logs <pod_name>

Go to the browser enter http://external IP

- June 28, 2022

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