Context

This is a POC to demonstrate how we can package and deploy a spring boot 2 based application to k8s.

Project structure

The project consiste of the following :

• Simple Spring boot 2 application, that expose a greeting endpoint.
• Dockerfile manifest to build the image
• deployment.yml manifest file for k8s resources definition (POD, SERVICE, PodDisruptionBudget)

Reference Documentation

For further reference, please consider the following sections:

• Kubernetes
• Official Apache Maven documentation
• Spring Boot

Deploy the spring application to kubernetes - Steps :

• Build the demo spring boot application - docker image

  mvn clean install
  docker build -t demo:0.1.0 .

• Push the built docker image to your own docker repository

  docker images
  docker login
  docker push (your_repo_name)/demo-k8s:0.3.0

• Install minikube in your computer using these instructions - https://kubernetes.io/docs/tasks/tools/install-minikube/
• Start the minikube in your local machine

  minikube start

• Create the deployment in kubernetes - it helps to pull the spring boot demo app docker images and deploy in K8S.

  kubectl create -f deployment.yml # your application will be deployed in kubernetes

• View the container status

  kubectl get pods

• To get the external Ip for accessing your application, please run

  kubectl get svc minikube tunnel

• Access your deployed spring boot application in kubernetes

  curl (external-ip)/hello

• To view the kubernetes setup

  minikube dashboard