This content originally appeared on DEV Community and was authored by RITIK KUMAR
Hello learners,
If you are reading How to Dockerize a Spring Boot App, I assume you already know what containerization is. If not, don’t worry—learn it in a simpler way by clicking here, or follow these steps below to dockerize your Spring Boot App.
You have your Spring Boot application up and running, and running Docker Desktop application.
Now, to containerization using Docker follow these steps,
1. First, create a .jar file of your Spring Boot application.
Open your terminal in the root directory and run the following command:
mvn clean packageORIf Maven is not installed, you can use the Maven wrapper. Run the following command:
./mvnw clean package(or use./mvnw clean package -DskipTeststo skip tests before building the .jar file).
2. Now that your .jar file is in the target folder, create your first Dockerfile.
- Create a file named ‘Dockerfile’ (with no extension) in the root directory. Then add the following contents:
FROM openjdk:17-jdk-alpine
WORKDIR /app
COPY target/*.jar app.jar
EXPOSE 8080
ENTRYPOINT ["java","-jar","/app.jar"]This will have instructions to install the necessary environment, execute your application, and expose the port where the app will run in the container (and on your host, with port mapping).
3. Now that you have a Dockerfile, build a Docker image by running the following command, run this cmd
docker build -t give_a_img_name .
4. Finally, run your Docker container using this command:
docker run --name give_con_name your-img-name
Now check you running container running using command:
docker ps
By the way, this is my first blog ever, so don’t forget to comment your views, feedback, suggestions, or anything else!
This content originally appeared on DEV Community and was authored by RITIK KUMAR
RITIK KUMAR | Sciencx (2025-03-31T18:17:29+00:00) Dockerizing Spring Boot Application: A Beginner’s Guide. Retrieved from https://www.scien.cx/2025/03/31/dockerizing-spring-boot-application-a-beginners-guide/
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