How To Dockerize Spring Boot Application

How To Dockerize Sample Spring Boot Application-Microservices

Prerequisite

· JDK 11

· DockerHub account and repository

· Docker installed and running

· User must be login to Docker Desktop

· sample microservice – department-service

https://github.com/anerurkar/microservices-with-k8/tree/main/Springboot-Microservice-kubernetes/Springboot-Microservice-kubernetes/department-service

1. Create a Docker file for the application as below and save it as Dockerfile

--------------------Dockerfile--------------------------------------------

FROM openjdk:11

ARG JAR_FILE=target/*.jar

COPY ${JAR_FILE} department-service.jar

ENTRYPOINT ["java","-jar","/department-service.jar"]

EXPOSE 9001

2. Edit pom.xml file and make entry for spotify docker plugin to build image and push

<plugin>

<groupId>com.spotify</groupId>

<artifactId>dockerfile-maven-plugin</artifactId>

<version>1.4.13</version>

<executions>

<execution>

<id>default</id>

<goals>

<goal>build</goal>

<goal>push</goal>

</goals>

</execution>

</executions>

<configuration>

<repository>anandn76/${project.name}</repository>

<tag>${project.version}</tag>

<useMavenSettingsForAuth>true</useMavenSettingsForAuth>

</configuration>

<dependencies>

<!-- To make this work on JDK 9+ -->

<dependency>

<groupId>javax.activation</groupId>

<artifactId>javax.activation-api</artifactId>

<version>1.2.0</version>

</dependency>

</dependencies>

</plugin>

Yellow block represent docker goals such as build and push

Green part represent your docker hub repository

For below block we need to make below entry in settings.xml file

<useMavenSettingsForAuth>true</useMavenSettingsForAuth>

3. Select your project->maven-> maven build and configure target as below

Click Run. It will build project, build image and push it to your docker hub repository as below.