Sunday, February 10, 2019

Docker - Containerizing Spring Boot Application

Greetings!

It is easy to containerize our spring boot application using docker. Let's begin.

Source code

Step 1:
Create a simple Spring boot application.
mvn clean package

Step 2:
Create Dockerfile
FROM openjdk:8-jdk-alpine
VOLUME /tmp
COPY target/spring-docker-0.0.1-SNAPSHOT.jar spring-docker-0.0.1-SNAPSHOT.jar
ENTRYPOINT ["java","-jar","/spring-docker-0.0.1-SNAPSHOT.jar"]

Step 3:
Create a docker image using our Dockerfile
docker build -t spring-docker-1 .

Step 4:
Make sure our image is built.
docker images

Step 5:
Create a container using our Spring boot image.
docker container run -d -p 8080:8080 --name sd-1 spring-docker-1

Step 6:
Check logs to see whether it is started correctly.
docker logs sd-1

Step 7:
Go to web browser to see our app in action.
http://localhost:8080/
http://localhost:8080/echo

Awesome work! Now we have a running Docker container of our Spring boot application.

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