How do you deploy a Spring Boot application in Docker?

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1. Build the Spring Boot Application

• First, you create your Spring Boot application as usual and package it into a JAR file using Maven or Gradle.

• Example: myapp.jar in the target/build folder.

2. Create a Dockerfile

• A Dockerfile is a simple text file with instructions for building a Docker image.

• In this file, you define:

  • The base image (like Java or OpenJDK).

  • The JAR file to copy into the container.

  • The command to run the application.

3. Build the Docker Image

• Using the Dockerfile, you create a Docker image of your application.

• This image includes the JAR file and the runtime environment (Java).

• The image acts like a packaged version of your app that can run anywhere Docker is available.

4. Run the Container

• Once the image is built, you start a container from it.

• The container runs your Spring Boot application inside an isolated environment.

• You can map ports from the container to your local machine so the app is accessible (for example, map container port 8080 to host port 8080).

5. Verify the Deployment

• Open a browser or API client and check the exposed endpoint.

• If everything is configured properly, your Spring Boot app will run inside Docker.

6. Optional Steps

• Push the Docker image to a registry (like Docker Hub, AWS ECR, or GCP Artifact Registry) so it can be reused or deployed in other environments.

• Use orchestration tools like Kubernetes or Docker Compose for scaling and managing multiple containers.

✅ In summary:

• Package Spring Boot app into JAR → Create Dockerfile → Build Docker image → Run container → Access app via mapped port.

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