dstar55/docker-hello-world-spring-boot repository overview

Hello World sample shows how to deploy SpringBoot⁠ RESTful web service application with Docker⁠ and with Kubernetes⁠

⁠Prerequisite

Installed:
Docker⁠
git⁠

Optional:
Docker-Compose⁠
Java 1.8 or 11.1⁠
Maven 3.x⁠

⁠Steps

⁠Clone source code from git

git clone https://github.com/dstar55/docker-hello-world-spring-boot .

⁠Build Docker image

docker build -t="hello-world-java" .

Maven build will be executes during creation of the docker image.

⁠Run Docker Container

docker run -p 8080:8080 -it --rm hello-world-java

⁠Test application

curl localhost:8080

response should be:

Hello World

⁠Stop Docker Container:

docker stop `docker container ls | grep "hello-world-java:*" | awk '{ print $1 }'`

⁠Run with docker-compose

Build and start the container by running

docker-compose up -d 

⁠Test application with curl command

curl localhost:8080

response should be:

Hello World

⁠Stop Docker Container:

docker-compose down

⁠Deploy under the Kuberenetes cluster

⁠Prerequisite

⁠MiniKube

Installed: MiniKube⁠

Start minikube with command:

minikube start

⁠Retrieve and deploy application

kubectl create deployment hello-spring-boot --image=dstar55/docker-hello-world-spring-boot:latest

⁠Expose deployment as a Kubernetes Service

kubectl expose deployment hello-spring-boot --type=NodePort --port=8080

⁠Check whether the service is running

kubectl get service hello-spring-boot

response should something like:

NAME                TYPE       CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
hello-spring-boot   NodePort   xx.xx.xxx.xxx   <none>        8080:xxxxx/TCP   59m

⁠Retrieve URL for application(hello-spring-boot)

minikube service hello-spring-boot --url

response will be http..., e.g:

http://127.0.0.1:44963

⁠Test application with curl command(note: port is randomly created)

curl 127.0.0.1:44963

response should be:

Hello World