Dockerizing a Spring Boot Application

Spring Boot applications can be containerized using Docker to ensure seamless deployment and scalability.

Why Use Docker for Spring Boot?

• Consistency across development, testing, and production.
• Easy deployment and scaling of microservices.
• Lightweight and fast application packaging.

Creating a Dockerfile for Spring Boot

A Dockerfile defines the steps to package your Spring Boot application into a container.

# Use OpenJDK as the base image
FROM openjdk:17-jdk-alpine

# Set the working directory
WORKDIR /app

# Copy the application JAR file
COPY target/myapp.jar app.jar

# Expose the application's port
EXPOSE 8080

# Define the command to run the application
ENTRYPOINT ["java", "-jar", "app.jar"]
        

Building and Running the Docker Container

Once the Dockerfile is ready, follow these steps:

# Build the Docker image
$ docker build -t my-springboot-app .

# Run the container
$ docker run -p 8080:8080 my-springboot-app
        

Conclusion

Using Docker to containerize a Spring Boot application simplifies deployment and ensures consistency across different environments. In the next post, we will explore how to use Docker Compose for managing multi-container applications.