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docker-spring-boot-helloworld

Taking the Basic Hello World Application in Spring Boot! further. This example creates a docker container containing a Spring Boot application with a Controller that returns "Hello World!".

Note: Refer spring-boot-helloworld repo.

Prerequisites

• Java IDE (I am using IntelliJ CE)
• Maven
• Docker

System Configuration at time of test

• macOS Mojave - Version 10.14.6
• IntelliJ CE - Version CE 2019.2
• Maven - Version 3.6.1
• Docker Desktop - Version 2.1.0.1 (37199)

Initial Setup

Creating Spring project

Follow the steps outlined in spring-boot-helloworld GitHub project to create a Spring Boot application.

Dockerizing the application

Add Dockerfile

FROM openjdk:8-jre-alpine
COPY ./target/com.ameyrupji.helloworld-1.0-SNAPSHOT.jar /helloworld.jar

CMD ["/usr/bin/java", "-jar", "-Dspring.profiles.active=default", "/helloworld.jar"]

Build docker image

To build the docker image run the following command on the terminal: docker build -t spring-boot-helloworld:v1 .

To list the created docker images run the command on the terminal: docker images

Run the Docker Container

Run the following command to spin up the container server: docker run -d -p 45678:9091 spring-boot-helloworld:v1

To list all the containers running run this command on the terminal: docker ps -a

Test

Run the following command to ensure the server is running: curl localhost:45678/helloworld/

You can also view it in the browser by going to http://localhost:45678/helloworld/ and following response will show up:

Cleanup

To stop the container that is running use this command: docker stop {container_id}

To delete the container that was created use this command: docker rm {container_id}

To delete the docker image that was created: docker rmi {image_id}

Useful links

• https://github.com/ameyrupji-k8s/spring-boot-helloworld
• https://github.com/ameyrupji/docker-nginx-static-html-demo
• https://stackify.com/guide-docker-java/

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