Running SpringBoot app on Docker

Example

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.demo</groupId>
	<artifactId>hellospring</artifactId>
	<version>1</version>
	<name>HelloSpring</name>
	<description>HelloSpring</description>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.7.9</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<properties>
		<java.version>1.8</java.version>
		<maven.compiler.source>${java.version}</maven.compiler.source>
		<maven.compiler.target>${java.version}</maven.compiler.target>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<start-class>com.hellospring.App</start-class>
	</properties>
	<build>
		<pluginManagement>
			<plugins>
				<plugin>
					<groupId>org.springframework.boot</groupId>
					<artifactId>spring-boot-maven-plugin</artifactId>
				</plugin>
				<plugin>
					<groupId>org.apache.maven.plugins</groupId>
					<artifactId>maven-dependency-plugin</artifactId>
					<executions>
						<execution>
							<goals>
								<goal>sources</goal>
								<goal>resolve</goal>
							</goals>
							<configuration>
								<classifier>javadoc</classifier>
							</configuration>
						</execution>
					</executions>
				</plugin>
				<plugin>
					<groupId>org.springframework.boot</groupId>
					<artifactId>spring-boot-maven-plugin</artifactId>
					<configuration>
						<mainClass>com.hellospring.App</mainClass>
						<layout>JAR</layout>
					</configuration>
					<executions>
						<execution>
							<goals>
								<goal>repackage</goal>
							</goals>
						</execution>
					</executions>
				</plugin>
			</plugins>
		</pluginManagement>
		<finalName>hello-spring</finalName>
	</build>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>
</project>

Main class

package com.hellospring;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App {
	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}
}

Controller Class

package com.hellospring;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController()
@RequestMapping("/hello")
public class AppController {
	@GetMapping
	public String helloGradle() {
		System.out.println("Hello !");
		return "Hello !";
	}
}

Dockerfile

FROM maven AS build
MAINTAINER suraj kutteri <gill.tyson332@gmail.com>
WORKDIR /opt/build
COPY . .
#RUN mvn -B package --file pom.xml
RUN mvn -B package --file pom.xml spring-boot:repackage
FROM openjdk
#RUN groupadd --gid 1200 tyson332 && adduser --disabled-password --home /app --gecos "" --uid 1200 --gid 1200 tyson332
RUN groupadd --gid 1200 tyson332 && adduser --home /app --uid 1200 --gid 1200 tyson332
WORKDIR /app
COPY --from=build /opt/build/target/*.jar app.jar
COPY start.sh start.sh
RUN chmod +x start.sh
# RUN chown -R atomuser:atomuser /app
#ENTRYPOINT ["/app/start.sh"]
CMD ["java","-jar","app.jar"]

Create an Image of Docker

docker build -t spring_build_test:1 .

Run the Docker Image

#First Find the Id of docker image using below command
docker images
#Run the docker image by using below command
docker run <image_id>
docker run 86b3f95d7c91

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