Deploying a Spring Boot Application to Docker Using IntelliJ IDEA

This guide explains how to combine IntelliJ IDEA, Spring Boot, and Docker to create and deploy a Java web application.

1. Docker installation and remote configuration – Install Docker (see official docs) and edit vi /usr/lib/systemd/system/docker.service to add -H tcp://0.0.0.0:2375 to the ExecStart line, then reload and start the daemon and open the port with firewall-cmd --zone=public --add-port=2375/tcp --permanent.

2. Create a Spring Boot project – Use IDEA to generate a Maven project, configure the pom.xml with Spring Boot parent 2.0.2.RELEASE, add dependencies for spring-boot-starter-web, spring-boot-starter-test, and log4j, and include the docker-maven-plugin and maven-antrun-plugin for Docker image creation.

3. Add Docker support – Create src/main/docker/Dockerfile containing:

FROM openjdk:8-jdk-alpine<br/>ADD *.jar app.jar<br/>ENTRYPOINT ["java","-Djava.security.egd=file:/dev/./urandom","-jar","/app.jar"]

4. Application code – Add @SpringBootApplication class DockerApplication, a

@RestController

DockerController

that logs and returns "Hello Docker!", and an application.properties file configuring logging path and server port.

5. Build and run – Execute mvn package to build the JAR, then use the Docker Maven plugin to build the image (e.g., docker-demo:1.1) and run a container named docker-server. Verify the container logs and access the application via a browser at the mapped port.

By following these steps, the Spring Boot web service is containerized and can be deployed and managed easily with Docker.