Wednesday, March 3, 2021

Deploy Springboot Microservices App into Amazon EKS Cluster using Jenkins Pipeline | Containerize Springboot App and Deploy into EKS Cluster using Jenkins Pipeline

We will learn how to automate Docker builds using Jenkins and Deploy into AWS EKS - Kubernetes Cluster. 

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
- Automating Docker image creation
- Automating Docker image upload into Docker Hub
- Automating Deployments to Kubernetes Cluster
 
 

Please watch the above steps in YouTube channel:
 
Pre-requistes:
1. Amazon EKS Cluster is setup and running. Click here to learn how to create Amazon EKS cluster.
3. Setup Jenkins slave, install docker in it.
4. Docker, Docker pipeline and Kubernetes Deploy plug-ins are installed in Jenkins



5. Docker hub account setup in https://cloud.docker.com
6. Install kubectl on your instance


Step #1 -Make sure Jenkins can run Docker builds after validating per pre-requistes

Step #2 - Create Credentials for Docker Hub
Go to Jenkins UI, click on Credentials -->


Click on Global credentials
Click on Add Credentials


Now Create an entry for your Docker Hub account. Make sure you enter the ID as dockerhub

Step #3 - Create Credentials for Kubernetes Cluster
Click on Add Credentials, use Kubernetes configuration from drop down.


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


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

Step #4 - set a clusterrole as cluster-admin

By default, clusterrolebinding has system:anonymous set which blocks the cluster access. Execute the following command to set a clusterrole as cluster-admin which will give you the required access.

kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=system:anonymous

Step # 5 - Create a pipeline in Jenkins
Create a new pipeline job.


Step # 6 - Copy the pipeline code from below
Make sure you change red highlighted values below:
Your docker user id should be updated.
your registry credentials ID from Jenkins from step # 1 should be copied

node ("slave") {
  def image
  def mvnHome = tool 'Maven3'
     stage ('checkout') {
        checkout([$class: 'GitSCM', branches: [[name: '*/master']], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[credentialsId: '', url: 'https://bitbucket.org/ananthkannan/myawesomeangularapprepo/']]])      
        }
   
    stage ('Build') {
            sh 'mvn -f MyAwesomeApp/pom.xml clean install'           
        }
       
       
    stage ('Docker Build') {
         // Build and push image with Jenkins' docker-plugin
            withDockerRegistry([credentialsId: "dockerhub", url: "https://index.docker.io/v1/"]) {
            image = docker.build("akdevopscoaching/mywebapp", "MyAwesomeApp")
            image.push()    
            }
        }

      stage ('K8S Deploy') {
       
                kubernetesDeploy(
                    configs: 'MyAwesomeApp/springboot-lb.yaml',
                    kubeconfigId: 'K8S',
                    enableConfigSubstitution: true
                    )           
               
            
        }
    
}

Step # 7 - Build the pipeline
Once you create the pipeline and changes values per your Docker user id and credentials ID, click on 


Step # 8 - Verify deployments to K8S

kubectl get pods



kubectl get deployments

kubectl get services



Steps # 9 - 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://master_or_worker_node_public_ipaddress:port_no_from_above

You should see page like below:




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