Friday, May 19, 2023

How to Deploy Springboot Microservices App into EKS cluster using Jenkins Pipeline and Helm | Deploy Microservices into EKS cluster using Helm and Jenkins Pipeline

We are going to learn how to automate build and deployment of Springboot Microservices Docker Container into Elastic Kubernetes Cluster(EKS) using Helm and Jenkins pipeline.

What is Helm?

Helm is a package manager for Kubernetes. Helm is the K8s equivalent of yum or apt. It accomplishes the same goals as Linux system package managers like APT or YUM: managing the installation of applications and dependencies behind the scenes and hiding the complexity from the user.

To learn more about Helm, please click here.

Sample springboot App Code:

I have created a sample Springboot App setup in GitHub. Click here to access code base in GitHub. 

Jenkins pipeline will:

- Automate maven build(jar) using Jenkins
- Automate Docker image creation
- Automate Docker image upload into Elastic container registry(ECR)
- Automate Springboot docker container deployments into Elastic Kubernetes Cluster using Helm charts

1. EKS cluster needs to be up running. Click here to learn how to create Amazon EKS cluster.
2. Jenkins instance is up and running
3. Install AWS CLI on Jenkins instance
4. Helm installed on Jenkins instance
5. Install 
6. Install eksctl on Jenkins instance
7. Install Docker in Jenkins and Jenkins have proper permission to perform Docker builds
8. Make sure to Install Docker, Docker pipeline 

10. Dockerfile created along with the application source code for springboot App.
11. Namespace created in EKS cluster

The Code for this video is here:

Create Helm chart using helm command
Go to your root of repo where you have source code for your springboot application. Create helm chart by executing below command:

helm create mychart
tree mychart
Execute the above command to see the files created.

Add Docker image details to download from ECR before deploying to EKS cluster
open mychart/values.yaml.

Enter service type as LoadBalancer
And also
open mychart/templates/deployment.yaml and change containerPort to 8080

Save the files, commit and push into repo.

Step # 1 - Create Maven3 variable under Global tool configuration in Jenkins
Make sure you create Maven3 variable under Global tool configuration. 

Step #2 - Create Credentials for connecting to EKS cluster using Kubeconfig
Go to Jenkins UI, click on Credentials -->

Click on Global credentials
Click on Add Credentials

use secret file from drop down.

you should see the nodes running in EKS cluster.

kubectl get nodes

Execute the below command to get kubeconfig info, copy the entire content of the file:
cat ~/.kube/config

Open your text editor or notepad, copy and paste the entire content and save in a file.
We will upload this file.

Enter ID as K8S and choose File and upload the file and save.

Step # 3 - Create a namespace in EKS
kubectl create ns helm-deployment

Step # 4 - Create a pipeline in Jenkins
Create a new pipeline job.

Step # 5 - Copy the pipeline code from below
Make sure you change below red marked values as per your settings highlighted in yellow below:

pipeline {
   tools {
        maven 'Maven3'
    agent any
    environment {
        registry = ""
    stages {
        stage('Cloning Git') {
            steps {
                checkout([$class: 'GitSCM', branches: [[name: '*/master']], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[credentialsId: '', url: '']]])     
      stage ('Build') {
          steps {
            sh 'mvn clean install'           
    // Building Docker images
    stage('Building image') {
        script {
          dockerImage = registry 
    // Uploading Docker images into AWS ECR
    stage('Pushing to ECR') {
         script {
                sh 'aws ecr get-login-password --region us-east-1 | docker login --username AWS --password-stdin'
                sh 'docker push$BUILD_NUMBER'
        stage ('Helm Deploy') {
          steps {
            script {
                sh "helm upgrade first --install mychart --namespace helm-deployment --set image.tag=$BUILD_NUMBER"

Step # 6 - Build the pipeline

Step # 7 - Verify deployments in EKS
Execute the below command to list the helm deployments:
helm ls -n helm-deployment

kubectl get pods -n helm-deployment

kubectl get services -n helm-deployment

Steps # 8 - Access Springboot App Deployed in EKS cluster
Once deployment is successful, go to browser and enter above load balancer URL mentioned above

You should see page like below:

Cleanup EKS Cluster using eksctl
To avoid charges from AWS, you should clean up resources. 

eksctl delete cluster --name demo-eks --region us-east-1

Watch steps in Youtube channel:

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