Dockerizing your Spring Boot Application

Dockerizing your Spring Boot Application. Creating a Docker container for a Spring Boot application allows you to deploy and scale your application seamlessly across different environments. This tutorial provides a step-by-step guide to dockerize your Spring Boot application.

Spring Boot Docker Image


Before you start, ensure that you have the following installed:

  1. Java: Spring Boot typically uses Java, so make sure you have Java installed. you can use JDK 8 or higher.
  2. Maven or Gradle: These are the most common build tools for managing Spring Boot projects.
  3. Docker: You need Docker installed on your machine to build and run the Docker container.

Create a Spring Boot Application

If you don’t already have a Spring Boot application, you can create one using Spring Initializr.

  • Go to the Spring Initializr Website
  • Choose your preferred product metadata(Group, Artifacts, etc)
  • Add dependencies you might need.
  • Click on Generate to download your project.

Add a Dockerfile to your Application

Create a file named 'Dockerfile'in the root directory Spring Boot application with the following content.


  • 'FROM openjdk:8-jdk-alpine': This line tells Docker to use the OpenJDK 8 image as the base.
  • 'WORKDIR /app': Sets the working directory for any RUN, CMD, ENTRYPOINT, COPY, and ADD commands.
  • 'COPY target/*.jar app.jar': Copies the built jar file from the target directory to the Docker image as ‘app.jar’.
  • 'EXPOSE 8080': Exposes port 8080 to enable networking between the container and the outside world.
  • 'ENTRYPOINT': Specifies the command to run within the container.

Build the Application

Before creating a Docker image, you need to build your Spring Boot application. Navigate to your project directory in the terminal and run:

If using Maven:

If using Gradle:

This command builds your application and creates a jar file in the 'target/'or 'build/libs/'directory.

Build the Docker Image

Now, build your Docker image using the following command in the terminal.

This command builds the Docker image using the Dockerfile in your current directory and tags the image as 'springboot-application'.

Run the Docker Container

To run your docker container, use :

This command runs the docker container and maps port 800 of the container to port 8080 on your host allowing you to access the application via 'localhost:8080'.

Note: You can change the port number to your requirement or preference.

Dockerizing your spring boot application is a straightforward process that can significantly simplify deployment and scaling in the production environment.

Happy Coding & Learning

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