Deploy Springboot Microservices App into Amazon EKS Cluster using Jenkins Pipeline and Kubectl CLI Plug-in | Containerize Springboot App and Deploy into EKS Cluster using Jenkins Pipeline

 We will learn how to create CICD pipeline to deploy springboot microservices using Jenkins pipeline into EKS Cluster with help of Kubernetes CLI plug-in.

We will use Springboot Microservices based Java application. I have already created a repo with source code + Dockerfile. The repo also have Jenkinsfile for automating the following:

- Automating builds using Jenkins Pipeline
- Automating Docker image creation and tagging
- Automating Docker image upload into AWS ECR
- Automating Docker Containers Deployments to Kubernetes Cluster

 

Watch steps in YouTube channel:

Same Code for this video is here:

Make sure you fork my repo https://github.com/akannan1087/springboot-app

Pre-requisites:
1. Amazon EKS Cluster is setup and running. Click here to learn how to create Amazon EKS cluster.

2. Create ECR repo in AWS

3. Jenkins Master is up and running

4. Docker installed on Jenkins instance 

5. Docker, Docker pipeline and Kubernetes CLI plug-ins are installed in Jenkins

Install Kubernetes CLI plug-in:

6. Install kubectl on your instance

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 Kubernetes Cluster using kubeconfig

Click on Add Credentials, use Kubernetes configuration from drop down.

use secret file from drop down.

execute the below command to login as jenkins user.

sudo su - jenkins

you should see the nodes running in EKS cluster.

kubectl get nodes

Create namespace to deploy the containers

kubectl create namespace springboot-app-ns

kubectl get ns

Execute the below command to get kubeconfig info, copy the entire content of the file:

cat /var/lib/jenkins/.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.

Enter ID as K8S and choose enter directly and paste the above file content and save.

Step # 3 - Create a pipeline in Jenkins

Create a new pipeline job.

Step # 4 - Copy the pipeline code from below
Make sure you change red highlighted values below as per your settings:
Your docker user id should be updated.
your registry credentials ID from Jenkins from step # 1 should be copied

pipeline {

   tools {

        maven 'Maven3'

    }

    agent any

    environment {

        registry = "account_id.dkr.ecr.us-east-1.amazonaws.com/coachak/my-docker-repo"

    }

   

    stages {

        stage('Cloning Git') {

            steps {

                checkout([$class: 'GitSCM', branches: [[name: '*/main']], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[credentialsId: '', url: 'https://github.com/akannan1087/springboot-app']]])     

            }

        }

      stage ('Build') {

          steps {

            sh 'mvn clean install'           

            }

      }

    // Building Docker images

    stage('Building image') {

      steps{

        script {

          dockerImage = docker.build registry 

          dockerImage.tag("$BUILD_NUMBER")

        }

      }

    }

   

    // Uploading Docker images into AWS ECR

    stage('Pushing to ECR') {

     steps{  

         script {

                sh 'aws ecr get-login-password --region us-east-1 | docker login --username AWS --password-stdin account_id.dkr.ecr.us-east-1.amazonaws.com'

                sh 'docker push account_id.dkr.ecr.us-east-1.amazonaws.com/coachak/my-docker-repo:$BUILD_NUMBER'

         }

        }

      }

    // Avoid latest tag image and pass build ID dynamically from Jenkins pipeline

       stage('K8S Deploy') {

        steps{   

            script {

                withKubeConfig([credentialsId: 'K8S', serverUrl: '']) {

                echo "Current build number is: ${env.BUILD_ID}"

               // Replace the placeholders in the deployment.yaml file 

                sh """ 

                sed -i 's/\${BUILD_NUMBER}/${env.BUILD_ID}/g' eks-deploy-k8s.yaml

                """ 

                sh ('kubectl apply -f  eks-deploy-k8s.yaml -n springboot-app-ns')

                }

            }

        }

       }

    }

}

Step # 5 - Build the pipeline

Once you create the pipeline and changes values per your configuration, click on Build now:

Step # 6 - Verify deployments to K8S

kubectl get deployments -n springboot-app-ns

kubectl get pods -n springboot-app-ns

kubectl get services -n springboot-app-ns

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

kubectl logs <pod_name> -n spring-app-ns

Steps # 7 - Access SpringBoot App in K8S cluster

Once build is successful, go to browser and enter master or worker node public ip address along with port number mentioned above

http://loadbalancer_ip_address

You should see page like below:

Note:

Make sure you fork my repo https://github.com/akannan1087/springboot-app

and make changes in eks-deploy-k8s.yaml to pull Docker image from your AWS ECR repo.