Dockerize A Spring Boot Application

Containers are standard units of software that package up code and all its dependencies so that the application runs quickly and reliably from one computing environment to another.

Docker File, Docker Image and Docker Containers are three important components of a dockerised project.

Docker File: A Docker File is text document which contains the instructions required by docker to build a Docker Image.

Docker Image: A docker image can be considered to be a template which is used to create Docker Containers. These images are read-only templates and form the building blocks of a Docker Container.

Docker Container: A Docker Container is a running instance of a Docker Image as they hold the entire package needed to run the application.

For Maven- You just have to run the below command and there is no need to modify your pom.xml to include the Jib dependency.

For Gradle- You need to add the Jib plugin in your build.gradle file as-

Or in the older style as-

Once you have added the plugin, refresh your Gradle dependencies by-

Or by clicking the reimport button in your respective IDE.

Then, run the following command-

The above command builds and pushes a container image for your application to a container registry.

The Docker File looks like-

2. Next, run the below command to generate the jar file of your application.

For Maven-

For Gradle-

3. Now create the docker image by executing the below command.

For Maven-

For Gradle-

To wrap up the above steps, the build will create a spring user and a spring group to run the application. It will later COPY the project JAR file into the container as "app.jar" that will be executed in the ENTRYPOINT.

To list the docker images use-

And to run the docker image use-

I hope you have understood how to containerise a Spring Boot application using Docker. Thank you for reading 😊.

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