springboot-docker-K8s

this project describes how to create and deploy a Springboot application in Kubernate cluster

Install of Docker and Kubernate on windows

- download Desktop Installer.exe and then follow link 
https://docs.docker.com/desktop/install/windows-install/

once installation is complete then setting --> Kubernates --> Enable Kubernate checkbox --> Apply and restart

Create Image on in Docker

in the springboot application to create an image first step is to create a file Dockerfile and add below code into it.
    FROM openjdk:17
    EXPOSE 8080
    ADD target/springbootWelcomeProject.jar springbootWelcomeProject.jar
    ENTRYPOINT [ "java", "-jar","/springbootWelcomeProject.jar" ]

Next is to build our project into Kubernetes cluster
go to the project root directory and then buid the project , and provide image name and version
    - > docker build -t projectwelcome:1.0 .

Deploy application on Kubernate

similarly install minikube on windows and once installtion is complete, we want docker to be executed inside minicube. 
- minikube
- Kubectl
below command is to run the docker image inside Kubernate.
- minikube start --driver=docker
Next create Kubernetes service object and deployment object so that we can access it from outer world.
here we are providing the deployment obj name and the port NO
- kubectl create deployment springbootwelcome-deployment --image=projectwelcome:1.0 --port=8080
- kubectl get deployment

to get more info about deployment do describe method
- Kubectl describe deployment springbootwelcome-deployment

to get pod details on which springboot application is up from the deployment
- kubectl get pods
to check the logs of the application
- kubectl logs springbootwelcome-deployment-985968694-hf5gx

Next we need to create a service so that it can be accessed outside of the world
-   kubectl get service
-   kubectl expose deployment springbootwelcome-deployment --type=NodePort
service/springbootwelcome-deployment exposed
-   kubectl get service
-   minikube service springbootwelcome-deployment --url
    http://127.0.0.1:64668

    http://127.0.0.1:64668/welcome
    Gives us response back by running above URL on web

Clean up process in Docker

to remove existing image , here a7daf591c0dd is image id
    - docker image rm a7daf591c0dd

Cleanup Process on Kubernate

Delete existing deployment in the kubectl cluster.

- kubectl delete deployment --all --all-namespaces=true

Next step

-   Add other componets like MySQL into the peoject and find best way to handle using Containerization.
-   Add DAO and implementation layer in the project
-   Add spring web capabilities like security and transaction modules.